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PRODID:-//Department of Theoretical Physics - ECPv6.5.1.5//NONSGML v1.0//EN
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METHOD:PUBLISH
X-ORIGINAL-URL:https://web-f1.ijs.si
X-WR-CALDESC:Events for Department of Theoretical Physics
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X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Ljubljana
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240418T140000
DTEND;TZID=Europe/Ljubljana:20240418T150000
DTSTAMP:20260403T233200
CREATED:20240323T012943Z
LAST-MODIFIED:20240408T075553Z
UID:22115-1713448800-1713452400@web-f1.ijs.si
SUMMARY:Labrini Athanasopoulou (TBA)
DESCRIPTION:https://indico.ijs.si/event/2076/
URL:https://web-f1.ijs.si/event/labrini-athanasopoulou-tba/
LOCATION:C/0-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240509T140000
DTEND;TZID=Europe/Ljubljana:20240509T150000
DTSTAMP:20260403T233200
CREATED:20240313T125226Z
LAST-MODIFIED:20240509T123626Z
UID:21331-1715263200-1715266800@web-f1.ijs.si
SUMMARY:Maciej Kierkla: EFT of supercooled phase transition
DESCRIPTION:We present an analysis of the first-order supercooled phase transition associated with symmetry breaking in the early Universe in a classically scale-invariant model. We analyze the role of higher order thermal corrections for these transitions\, and to what extent they can be computed using dimensionally reduced effective field theory (3D EFT). This framework requires high temperature (HT) expansion to be valid\, which seems challenging due to the presence of supercooling. We show how to reliably use the HT expansion in dimensionally reduced theory for the calculation of bubble nucleation rate. We compare the obtained results to the results of the most common scheme based on the so-called daisy resummation. We further compute all of phase transition characteristics\, discuss various scenarios of completing the transition and predict resulting gravitational-wave spectra and their observational prospects in future experiments such as LISA.\nhttps://indico.ijs.si/event/2070/
URL:https://web-f1.ijs.si/event/maciej-kierkla/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240516T140000
DTEND;TZID=Europe/Ljubljana:20240516T150000
DTSTAMP:20260403T233200
CREATED:20240427T073727Z
LAST-MODIFIED:20240516T122650Z
UID:25080-1715868000-1715871600@web-f1.ijs.si
SUMMARY:Lorenzo Ubaldi: False Vacuum Decay From Thin to Thick Walls
DESCRIPTION:The computation of the false vacuum decay rate in the situation with nearly degenerate vacua can be performed analytically in the well known thin wall approximation. If we depart from the near degeneracy of the vacua\, the approximation quickly ceases to work. This statement is known to practitioners of the field\, but it has a caveat: it is true only if one works at the leading order of the thin wall approximation. In this talk I will describe how to organize the calculation to systematically include higher order corrections in the thin wall parameter expansion. The first few orders can be computed analytically. It is enough to include them to improve the approximation and get a very accurate estimate of the bounce action also deep into thick wall regimes\, where the vacua are far apart. I plan to also briefly discuss how to deal in these cases with the calculation of the functional determinant\, also known as the prefactor\, in order to have the full proper understanding of the vacuum decay rate. In the whole talk I will only consider flat spacetime\, without gravity.\nhttps://indico.ijs.si/event/2133/
URL:https://web-f1.ijs.si/event/lorenzo-ubaldi-false-vacuum-decay-from-thin-to-thick-walls/
LOCATION:https://uu-se.zoom.us/j/64706033081 Passcode: 107002 (Zoom)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240521T140000
DTEND;TZID=Europe/Ljubljana:20240521T150000
DTSTAMP:20260403T233200
CREATED:20240429T092123Z
LAST-MODIFIED:20240521T112538Z
UID:25290-1716300000-1716303600@web-f1.ijs.si
SUMMARY:Diego Redigolo: Dark sectors at flavor factories
DESCRIPTION:I will discuss new ideas for reporpusing current flavor experiments to hunt for dark sectors particles. \nhttps://indico.ijs.si/event/2134/
URL:https://web-f1.ijs.si/event/diego-redigolo/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240523T140000
DTEND;TZID=Europe/Ljubljana:20240523T150000
DTSTAMP:20260403T233200
CREATED:20240416T100220Z
LAST-MODIFIED:20240515T142738Z
UID:24106-1716472800-1716476400@web-f1.ijs.si
SUMMARY:Nudžeim Selimović
DESCRIPTION:https://indico.ijs.si/event/2089/
URL:https://web-f1.ijs.si/event/nudzeim-selimovic/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240523T140000
DTEND;TZID=Europe/Ljubljana:20240523T150000
DTSTAMP:20260403T233200
CREATED:20240418T101241Z
LAST-MODIFIED:20240523T123631Z
UID:24290-1716472800-1716476400@web-f1.ijs.si
SUMMARY:Gašper Lipnik\, "Force inference in epithelial tissues"
DESCRIPTION:In this work\, we explore the ways of determining the mechanical properties of epithelial tissues. Knowledge of the mechanical parameters like forces between and pressures within cells leads to a deeper understanding of the processes in these tissues. To determine these parameters\, one can perform in vivo measurements using lasers\, optical tweezers\, micropipettes etc. However\, in vivo measurements are invasive\, technically challenging and local. Thus\, it is best to use noninvasive and global methods. One theoretical approach is force inference from cell shapes and connectivity as seen in microscope images\, and here we introduce three force inference methods.\nhttps://indico.ijs.si/event/2091/
URL:https://web-f1.ijs.si/event/gasper-lipnik-force-inference-in-epithelial-tissues/
LOCATION:C/0-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240528T134500
DTEND;TZID=Europe/Ljubljana:20240528T144500
DTSTAMP:20260403T233200
CREATED:20240510T110600Z
LAST-MODIFIED:20240528T114345Z
UID:26366-1716903900-1716907500@web-f1.ijs.si
SUMMARY:Innes Bigaran: Leveraging intermediate resonances to probe CP-violation at colliders
DESCRIPTION:We study the phenomenological implications of interference between tree-level contributions to decays to three-body final states. CP-violation in these decays arise via different virtualities of intermediate resonances\, and the presence of SM and/or new CP phases in a model Lagrangian. We highlight the manifestation of this CP-violating observable in the interference between SM charged-current decays and new-physics contributions to effective vector interactions in the EFT and in a UV-complete model featuring a scalar leptoquark\, $S_1$. We present a novel method for searching for CP-violating new physics effects utilising the differential cross sections of $ppto d_i ell u_ell$ decays\, with a detailed study of $ppto b tau u_tau$ simulating signal and background.\nhttps://indico.ijs.si/event/2146/
URL:https://web-f1.ijs.si/event/innes-bigaran/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240530T140000
DTEND;TZID=Europe/Ljubljana:20240530T150000
DTSTAMP:20260403T233200
CREATED:20240411T144041Z
LAST-MODIFIED:20240530T115521Z
UID:23648-1717077600-1717081200@web-f1.ijs.si
SUMMARY:Mario Reig Lopez: Testing the far UV of the Standard Model with axions
DESCRIPTION:In this talk I will discuss axion couplings to gauge bosons in 4-dimensional Grand Unified Theories and in (heterotic) String Theory. The topological nature of these couplings allows them to be matched from the UV to the IR\, and the ratio of the anomaly with photons and gluons for any axion is fixed by unification.  I will show that this implies that there is a single axion — the QCD axion — with an anomalous coupling to photons. Other light axion-like particles can couple to photons by mixing with the QCD axion\, and necessarily lie to the right of the QCD line prediction in the mass-coupling plane. As a result\, a discovery of an axion to the left of the QCD line can rule out simple GUTs and some heterotic string compactifications.Based on: 2206.07053 and future work.\nhttps://indico.ijs.si/event/2085/
URL:https://web-f1.ijs.si/event/mario-reig-lopez/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240610T120000
DTEND;TZID=Europe/Ljubljana:20240610T130000
DTSTAMP:20260403T233200
CREATED:20240506T132140Z
LAST-MODIFIED:20240610T104412Z
UID:25974-1718020800-1718024400@web-f1.ijs.si
SUMMARY:Bernat Corominas-Murtra\, "Topological transitions and cell-cell adhesion properties in development"
DESCRIPTION:Speakers: Bernat Corominas-Murtra (Karl-Franzens University Graz)\nThe developmental process implies precise but significant changes in the geometry and structure of the embryonic tissues. Recent results show that apparently minor changes in adhesion at the local level of cell-cell contacts trigger deep\, non-linear transitions in the topological organization of the whole embryonic tissue and\, in consequence\, change its material properties and facilitate geometrical deformations. Open questions remain\, like the potential existence of causal feedbacks between cell differentiation processes and the potential heterogeneity of topological patterns existing within the tissue. The results presented in this talk are based on the fundamental assumption that predictive frameworks in theoretical biology must explore the  connection between different scales of the system. In this particular case\, we use topology to establish a bridge between the system’s scales defined by i) the cell level and ii) the tissue level. This enables us to predict global\, non-trivial behaviours in tissues from the empirically feasible observables related to the mechanical properties of single cells.\nhttps://indico.ijs.si/event/2139/
URL:https://web-f1.ijs.si/event/bernat-corominas-murtra-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240613T141500
DTEND;TZID=Europe/Ljubljana:20240613T151500
DTSTAMP:20260403T233200
CREATED:20240506T132140Z
LAST-MODIFIED:20240611T231915Z
UID:25975-1718288100-1718291700@web-f1.ijs.si
SUMMARY:Tatyana Gavrilchenko\, "Lessons from the tracheal terminal cell: what a unicellular network can teach us about distribution network design principles"
DESCRIPTION:Speakers: Tatyana Gavrilchenko (Flatiron Institute\, NY\, USA)\nThe insect respiratory system is a network of air-filled tubes permeating the animal body\, supplying oxygen for metabolic activity and removing waste carbon dioxide. The majority of gas exchange occurs in the finest regions of the tracheal system\, the terminal cells. These cells have a unique and highly specialized tree-like structure with long thin branches\, reminiscent of neuronal arbors. While many aspects of the terminal cell are understood on a molecular level\, including the mechanisms that guide branch extension and lumen formation\, the macroscopic network features that allow for proper oxygen distribution remain mysterious. We use the Drosophila terminal cell as a model system for fundamental developmental problems of network structure and functions\, utilizing an imaging data set that fully maps the structure of over one hundred individual cells. First\, we find that scaling relations succinctly encapsulate the dynamics of growing networks\, and use the empirical scalings observed in the terminal cells to construct a minimal model of network growth that describes the system. Second\, to understand the interplay between structure and function in the trees\, we developed a model of oxygen distribution by a network embedded in a two-dimensional absorbing tissue\, driven purely by diffusion along oxygen partial pressure gradients. Our method works well on complex geometries\, including curved and branched networks that approximate the geometry of the terminal cells. These investigations offer insights into mammalian capillary networks\, which have different structural features and delivery mechanisms from terminal cells but are guided by similar developmental principles. Understanding the salient features that govern the structure of these biological networks is essential to designing synthetic vasculature\, a major step in the manufacture of artificial organs.\nhttps://indico.ijs.si/event/2138/
URL:https://web-f1.ijs.si/event/tatyana-gavrilchenko-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240617T140000
DTEND;TZID=Europe/Ljubljana:20240617T150000
DTSTAMP:20260403T233200
CREATED:20240502T142604Z
LAST-MODIFIED:20240617T125924Z
UID:25573-1718632800-1718636400@web-f1.ijs.si
SUMMARY:Ezequiel Alvarez: The Information frontier at the LHC
DESCRIPTION:Once we have obtained the data\, the question is how much information is encoded in it and how we can extract it. Any framework with this purpose utilizes information-besides-data and mathematical and statistical tools.  Bayesian statistics has the virtue that\, by modeling the inner structure of the data\, it allows us to inject prior information and its uncertainty as a catalyst to push out the information from the data.   The framework also possesses tools to assess the results unbiasedness and its consistency with the data.   We will show with examples at the LHC how to apply Bayesian tools in order to efficiently extract information about the physics inside.  We discuss possible applications in improving data-driven methods\, and in pp > hh > bbbb\, however the generality of the results apply to rethinking a variety of observables.  The method can exploit correlations at the event-by-event level and previously  untapped strengths such as for instance continuity and unimodality of some distributions.  We raise the question of whether there might be room for improvements in some of the current LHC analyses.\nhttps://indico.ijs.si/event/2135/
URL:https://web-f1.ijs.si/event/ezequiel-alvarez/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240626T130000
DTEND;TZID=Europe/Ljubljana:20240626T140000
DTSTAMP:20260403T233200
CREATED:20240607T162740Z
LAST-MODIFIED:20240626T110131Z
UID:29013-1719406800-1719410400@web-f1.ijs.si
SUMMARY:Martín Novoa-Brunet: NP @ High Precision beta decay
DESCRIPTION:https://indico.ijs.si/event/2166/
URL:https://web-f1.ijs.si/event/shoji-baratella-trailovic-the-standard-model-lifetime-is-slightly-shorter/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240627T140000
DTEND;TZID=Europe/Ljubljana:20240627T150000
DTSTAMP:20260403T233200
CREATED:20240415T083824Z
LAST-MODIFIED:20240627T124040Z
UID:24005-1719496800-1719500400@web-f1.ijs.si
SUMMARY:Manuel Szewc: Modeling Hadronization with Machine Learning
DESCRIPTION:A fundamental part of event generation\, hadronization is currently simulated with the help of fine-tuned empirical models. Motivated by the difficulties of these models\, in this talk I’ll present MLHAD: a proposed alternative where the empirical model is replaced by a surrogate Machine Learning-based model to be ultimately data-trainable. I’ll detail the current stage of development and discuss challenges and possible ways forward.\nhttps://indico.ijs.si/event/2088/
URL:https://web-f1.ijs.si/event/manuel-szewc/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240628T140000
DTEND;TZID=Europe/Ljubljana:20240628T150000
DTSTAMP:20260403T233200
CREATED:20240619T092342Z
LAST-MODIFIED:20240628T103014Z
UID:29998-1719583200-1719586800@web-f1.ijs.si
SUMMARY:Chandan Hati: Nonstandard Nucleon Decays
DESCRIPTION:Nucleon decays are generic predictions of many well motivated theories\, including those based on the unification of forces and supersymmetry. I will discuss how nonstandard nucleon decays offer a unique opportunity to broadly probe light new particles beyond the Standard Model with masses below few GeV\, including axion-like particles\, dark photons\, sterile neutrinos\, and scalar dark matter. Conventional searches can misinterpret and even completely miss such new physics. I will discuss a general strategy based on momenta of visible decay final states to probe these processes\, offering a rich physics program for existing and upcoming experiments such as Super-Kamiokande\, Hyper-Kamiokande\, DUNE\, and JUNO.\nhttps://indico.ijs.si/event/2173/
URL:https://web-f1.ijs.si/event/chandan-hati-nonstandard-nucleon-decays/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240711T140000
DTEND;TZID=Europe/Ljubljana:20240711T150000
DTSTAMP:20260403T233200
CREATED:20240701T133914Z
LAST-MODIFIED:20240711T113240Z
UID:30991-1720706400-1720710000@web-f1.ijs.si
SUMMARY:Luighi Leal: Correlating $0 ubetabeta$ decays and flavor observables in leptoquark models
DESCRIPTION:https://indico.ijs.si/event/2231/
URL:https://web-f1.ijs.si/event/luighi-leal-correlating-0-ubetabeta-decays-and-flavor-observables-in-leptoquark-models/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240829T140000
DTEND;TZID=Europe/Ljubljana:20240829T150000
DTSTAMP:20260403T233200
CREATED:20240819T151141Z
LAST-MODIFIED:20240829T125758Z
UID:35415-1724940000-1724943600@web-f1.ijs.si
SUMMARY:Nudžeim Selimović: Topological Portal to the Dark Sector
DESCRIPTION:I will discuss a novel topological portal between quantum chromodynamics (QCD) and a dark QCD-like sector. Such a portal is present only for a unique coset structure after QCD confinement and it connects three QCD to two dark pions. When gauged\, it is the leading portal between the two sectors\, providing an elegant self-consistent scenario of light thermal inelastic dark matter. The inherent antisymmetrization due to a Wess–Zumino–Witten-like effective interaction leads to diminished annihilations at later times and suppressed direct detection. However\, novel collider signatures offer tremendous prospects for discovery at Belle II. The talk is based on https://arxiv.org/abs/2401.09528 with Joe Davighi and Admir Greljo.\nhttps://indico.ijs.si/event/2247/
URL:https://web-f1.ijs.si/event/nudzeim-selimovic-tba/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240902T140000
DTEND;TZID=Europe/Ljubljana:20240902T150000
DTSTAMP:20260403T233200
CREATED:20240819T122059Z
LAST-MODIFIED:20240902T125507Z
UID:35397-1725285600-1725289200@web-f1.ijs.si
SUMMARY:Jan Rozman\, "From Substrate Dissipation to Internal Dissipation Vertex Model Dynamics: Generating Sustained Flows"
DESCRIPTION:Speakers: Jan Rozman\nComplex tissue flows in epithelia are driven by intra- and inter-cellular processes that generate\, maintain\, and coordinate mechanical forces. There has been growing evidence that cell shape anisotropy\, manifested as nematic order\, plays an important role in this process.  Here we extend an active nematic vertex model by replacing substrate friction with internal viscous dissipation\, dominant in epithelia not supported by a substrate or the extracellular matrix\, which are found in many early-stage embryos.  When coupled to cell shape anisotropy\, the internal viscous dissipation allows for long-range velocity correlations and thus enables the spontaneous emergence of flows with a large degree of spatiotemporal organisation. We demonstrate sustained flow in epithelial sheets confined to a channel\, providing a link between the cell-level vertex model of tissue dynamics and continuum active nematics\, whose behaviour in a channel is theoretically understood and experimentally realisable. Our findings also show a simple mechanism that could account for collective cell migration correlated over distances large compared to the cell size\, as observed during morphogenesis.\nhttps://indico.ijs.si/event/2245/
URL:https://web-f1.ijs.si/event/jan-rozman-tba/
LOCATION:C/2-X – F1 čajnica (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240903T140000
DTEND;TZID=Europe/Ljubljana:20240903T150000
DTSTAMP:20260403T233200
CREATED:20240819T122059Z
LAST-MODIFIED:20240903T125748Z
UID:35398-1725372000-1725375600@web-f1.ijs.si
SUMMARY:Somiealo Azote\, "Quantitative Predictions of biomechanical drivers of cell delamination in stratified epithelia (skin epidermis) using a dynamic 3D vertex model"
DESCRIPTION:Speakers: Somiealo Azote\nDuring embryonic development\, the skin epidermis gradually transitions from a single layer of stem cells to a stratified\, multi-layered tissue. This process involves the coordinated differentiation and upward movement of basal cells\, known as delamination. It is not clear what mechanisms control this differentiation and delamination\, allowing cells to move upward across the sharp basal-suprabasal boundary to regulate stratified tissue self-renewal and homeostasis. Although some delamination events are coupled to cell division\, we first focus on the simpler case where delamination occurs in the absence of cell division\, and develop a biomechanical model to investigate several experimentally driven hypotheses for what drives delamination in those cases: i) changes in the adhesion of basal cells to extra cellular matrix in the basement membrane\, ii) local fluidization of surrounding tissue due to fluctuations or nearby cell divisions\, or iii) cell autonomous changes to cell-cell adhesion and cortical tension. Experimental data from the developing mammalian epithelium in the Niessen and Wickström labs have identified specific changes to the transcriptome of cells committed to delamination. Many of these changes are associated with cell-cell and cell-substrate adhesion pathways. We incorporate them in the computational models as changes to the model parameters describing heterotypic and homotypic cell-cell interfacial tensions and adhesion to substrate. We make quantitative predictions for cell shape\, delamination probabilities\, and delamination rates that we compare directly to experiments\, in both control and perturbed systems\, to determine how different mechanisms are driving delamination.\nhttps://indico.ijs.si/event/2244/
URL:https://web-f1.ijs.si/event/somiealo-azote-quantitative-predictions-of-biomechanical-drivers-of-cell-delamination-in-stratified-epithelia-skin-epidermis-using-a-dynamic-3d-vertex-model/
LOCATION:C/2-X – F1 čajnica (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240905T140000
DTEND;TZID=Europe/Ljubljana:20240905T150000
DTSTAMP:20260403T233200
CREATED:20240623T113943Z
LAST-MODIFIED:20240905T122617Z
UID:30278-1725544800-1725548400@web-f1.ijs.si
SUMMARY:Shoji\, Baratella: The Standard Model lifetime is slightly shorter
DESCRIPTION:We revisit the decay rate of the electroweak vacuum in the Standard Model with the full one-loop prefactor. We focus on the gauge degrees of freedom and derive the degeneracy factors appearing in the functional determinant using group theoretical arguments. Our treatment shows that the transverse modes were previously overcounted\, so we revise the calculation of that part of the prefactor. The new result modifies the gauge fields’ contribution by 7% and slightly decreases the previously predicted lifetime of the electroweak vacuum\, which remains much longer than the age of the universe. Our discussion of the transverse mode degeneracy applies to any calculation of functional determinants involving gauge fields in four dimensions.\nhttps://indico.ijs.si/event/2176/
URL:https://web-f1.ijs.si/event/shoji-baratella-the-standard-model-lifetime-is-slightly-shorter/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240912T140000
DTEND;TZID=Europe/Ljubljana:20240912T150000
DTSTAMP:20260403T233200
CREATED:20240827T122432Z
LAST-MODIFIED:20240912T130001Z
UID:36147-1726149600-1726153200@web-f1.ijs.si
SUMMARY:Pietro Baratella: Journal Club on WZW terms without anomalies: generalised symmetries in chiral Lagrangians
DESCRIPTION:Journal Club on WZW terms without anomalies: generalised symmetries in chiral Lagrangians (arXiv:2407.20340)Abstract:We consider a 4d non-linear sigma model on the coset $(text{SU}(N)_L times text{SU}(N)_R times text{SU}(2))/(text{SU}(N)_{L+R}times text{U})cong text{SU}(N) times S^2$\, that features a topological Wess–Zumino–Witten (WZW) term whose curvature is $frac{n}{24pi^2}text{Tr}(g^{-1}dg)^3 wedge mathrm{Vol}_{S^2}$ where $g$ is the $text{SU}(N)$ pion field. This WZW term\, unlike its familiar cousin in QCD\, does not match any chiral anomaly\,so its microscopic origin is not obviously QCD-like. We find that generalised symmetries provide a key to unlocking a UV completion.The $S^2$ winding number bestows the theory with a 1-form symmetry\, and the WZW term intertwines this with the $text{SU}(N)^2$ flavour symmetry into a 2-group global symmetry. Like a ‘t Hooft anomaly\, the 2-group symmetry should match between UV and IR\, precluding QCD-like completions that otherwise give the right pion manifold. We instead construct a weakly-coupled UV completion that matches the 2-group symmetry\, in which an abelian gauge field connects the QCD baryon number current to the winding number current of a $mathbb{C}P^1$ model\, and explicitly show how the mixed WZW term arises upon flowing to the IR. The coefficient is fixed to be the number of QCD colours and\, strikingly\, this matching must be `tree-level exact’ to satisfy a quantization condition.We discuss generalisations\, and elucidate the more intricate generalised symmetry structure that arises upon gauging an anomaly-free subgroup of $text{SU}(N)_{L+R}$. This WZW term may even play a phenomenological role as a portal to a dark sector\, that determines the relic abundance of dark matter.\nhttps://indico.ijs.si/event/2259/
URL:https://web-f1.ijs.si/event/pietro-baratella-journal-club-on-wzw-terms-without-anomalies-generalised-symmetries-in-chiral-lagrangians/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240912T141500
DTEND;TZID=Europe/Ljubljana:20240912T151500
DTSTAMP:20260403T233200
CREATED:20240903T140241Z
LAST-MODIFIED:20240912T130001Z
UID:36702-1726150500-1726154100@web-f1.ijs.si
SUMMARY:Nataša Adžić\, "The role of effective interactions in predicting the exotic states of soft matter"
DESCRIPTION:Speakers: Nataša Adžič (Institute of Physics\, Belgrade)\n Studying static properties of colloidal suspensions is often a computationally expensive task due to their complex composition and interactions that appear at various length scales. Large macromolecules are surrounded by small solute particles and typically some other small components such as salt ions. One of the useful coarse-graining tools for studying self-organisation of macromolecules in solutions is the method of effective interactions. It is based on calculation of the effective Hamiltonian as a canonical trace over small degrees of freedom for the given fixed configuration of large ones . The calculated effective interaction can be further employed in Monte Carlo simulations between effective point particles that mimic behaviour of large macromolecules. In that way a fast scan of their phase organisation can be obtained. In this talk we will see how this method applies to self-organisation of various all-DNA dendrimers\, macromolecules composed solely of short segments of DNA chains .     R. Blaak\, B. Capone\, C. N. Likos\, and L. Rovigatti\, Accurate Coarse-Grained Potentials for Soft Matter Systems\, in Computational Trends in Solvation and Transport in Liquids – Lecture Notes\, IAS Series\, Vol. 28\, 2015. N. Adzic\, C. Jochum\, C. N. Likos\, and E. Stiakakis\, “Engineering Ultrasoft Interactions in Stiff All-DNA Dendrimers by Site-Specific Control of Scaffold Flexibility”\, Small 2023\, 2308763 (2024). E. Stiakakis\, N. Jung\, N. Adzic\, T. Balandin\, E. Kentzinger\, U. Rucker\, R. Biehl\, J. Dhont\, U. Jonas\, and C. N. Likos\, “Self Assembling Cluster Crystals from DNA Based Dendritic Nanostructres”\, Nat. Commun. 12\, 7167 (2021). N. Adzic\, C. Jochum\, E. Stiakakis\, G. Kahl\, C.N. Likos\, “Self-organisation of planar and tripod-shaped DNA stars confined to the water-air interface”\, in preparation for submission\nhttps://indico.ijs.si/event/2262/
URL:https://web-f1.ijs.si/event/natasa-adzic-the-role-of-effective-interactions-in-predicting-the-exotic-states-of-soft-matter/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20240924T110000
DTEND;TZID=Europe/Ljubljana:20240924T120000
DTSTAMP:20260403T233200
CREATED:20240919T113033Z
LAST-MODIFIED:20240924T091052Z
UID:38210-1727175600-1727179200@web-f1.ijs.si
SUMMARY:Herbi Dreiner: Testing Locality via Bell's Inequality at Colliders?
DESCRIPTION:https://indico.ijs.si/event/2274/
URL:https://web-f1.ijs.si/event/herbi-dreiner-testing-locality-via-bells-inequality-at-colliders/
LOCATION:C/2-X – F1 čajnica (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241010T140000
DTEND;TZID=Europe/Ljubljana:20241010T150000
DTSTAMP:20260403T233200
CREATED:20240927T070622Z
LAST-MODIFIED:20241010T125120Z
UID:39009-1728568800-1728572400@web-f1.ijs.si
SUMMARY:Domen Vaupotič\, "Programmable RNA Condensates"
DESCRIPTION:https://indico.ijs.si/event/2280/
URL:https://web-f1.ijs.si/event/domen-vaupotic-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241010T153000
DTEND;TZID=Europe/Ljubljana:20241010T163000
DTSTAMP:20260403T233200
CREATED:20240916T080814Z
LAST-MODIFIED:20241010T141046Z
UID:37890-1728574200-1728577800@web-f1.ijs.si
SUMMARY:Joshua Lockyer: Exploring near-conformal dark sector theories
DESCRIPTION:Dark-showers offer a compelling collider signature for Hidden Valley models featuring a confining dark sector. Our work extends the investigation of these models to near-conformal theories where the running coupling\, controlled by renormalization group equations (RGE)\, flows near to an infra-red fixed point. We establish a framework of two classes of RGE solutions which cover much of the parameter space of confining theories\, allowing us to present the first phenomenological results of such near-conformal dark sector theories.\nhttps://indico.ijs.si/event/2271/
URL:https://web-f1.ijs.si/event/joshua-lockyer/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (A/1-106 – Seminarska soba fizike (F5))
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241016T110000
DTEND;TZID=Europe/Ljubljana:20241016T120000
DTSTAMP:20260403T233200
CREATED:20240924T072832Z
LAST-MODIFIED:20241016T091237Z
UID:38711-1729076400-1729080000@web-f1.ijs.si
SUMMARY:Benjamin Fuks: Signatures of toponium formation in LHC run 2 data
DESCRIPTION:We study reported deviations between observations and theoretical predictions associated with the production of a pair of di-leptonically decaying top quarks at the LHC\, and we examine the possibility that they reflect a signal of toponium formation. We investigate the production by gluon fusion of a colour-singlet spin-0 toponium bound state of a top and anti-top quark\, that then decays di-leptonically. We find strong correlations favouring the production of di-lepton systems featuring a small angular separation in azimuth and a small invariant mass. Although toponium production only contributes to 0.8% of the total top-quark pair-production cross section at the 13 TeV LHC\, there is a possibility that it can account for observed excesses in the narrow edges of phase space. We propose a method to discover toponium formation by `reconstructing’ both its top and anti-top quark constituents in the di-lepton channel.\nhttps://indico.ijs.si/event/2276/
URL:https://web-f1.ijs.si/event/benjamin-fuks-seeking-a-coherent-explanation-of-lhc-excesses-for-compressed-spectra/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241017T141500
DTEND;TZID=Europe/Ljubljana:20241017T151500
DTSTAMP:20260403T233200
CREATED:20241006T191857Z
LAST-MODIFIED:20241017T125158Z
UID:39971-1729174500-1729178100@web-f1.ijs.si
SUMMARY:Zala Korenjak\, "Smectic and soap bubble optofluidic lasers"
DESCRIPTION:We have demonstrated for the first time that soap bubbles can be used as lasers. Soap bubbles are simple\, yet very unique and marvelous objects. They are very interesting to the wide audience\, from children of all ages\, to researchers of a number of disciplines including mathematics\, physics\, chemistry and biology. To realize the soap bubble lasers\, we doped the bubbles with a fluorescent dye and pumped them with an external laser. The generated light circulated in the wall of the bubble\, which consequently worked as a laser cavity. Instead of soap\, we also made bubbles from surfactant-like molecules without any water present. Specifically\, smectic liquid crystals\, which molecules form well defined molecular layers\, were used for this purpose. Such bubbles had a completely uniform thickness with an integer number of molecular layers and most importantly they were extremely stable. The bubbles were attached to a tube or free floating in a container filled with carbon dioxide. The resulting whispering gallery mode lasing was observed in the spectrum of the emitted light as hundreds of regularly spaced sharp peaks. Shifts in the lasing wavelengths enabled the measurement of subtle size changes as small as 10 nm in a millimeter-sized bubble. This incredible precision allowed the bubbles to be used as one of the best pressure and electric field sensors developed till now. This unique physical system may in future allow the study of novel optical and mechanical phenomena in thin films.Video: https://youtu.be/oMXFM70Bmh4 \nhttps://indico.ijs.si/event/2342/
URL:https://web-f1.ijs.si/event/zala-korenjak-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241017T153000
DTEND;TZID=Europe/Ljubljana:20241017T163000
DTSTAMP:20260403T233200
CREATED:20240819T130528Z
LAST-MODIFIED:20241017T142516Z
UID:35404-1729179000-1729182600@web-f1.ijs.si
SUMMARY:Maxim Mai: Lattice studies of resonances that decay to three-hadrons
DESCRIPTION:I will present the lattice results and underlying formalism on resonances omega and a1 that both strongly decay to three-hadron state pi-pi-pi. These are the first and only two resonances extracted from a three-hadron decay on lattice so far.   \nhttps://indico.ijs.si/event/2246/
URL:https://web-f1.ijs.si/event/maxi-mai-tba/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (A/1-106 – Seminarska soba fizike (F5))
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241024T140000
DTEND;TZID=Europe/Ljubljana:20241024T150000
DTSTAMP:20260403T233200
CREATED:20241002T161227Z
LAST-MODIFIED:20241024T124059Z
UID:39565-1729778400-1729782000@web-f1.ijs.si
SUMMARY:Katarina Kokalj\, "Structural analysis of partially fluorinated liquid ethanol"
DESCRIPTION:Per- and polyfluoroalkyl substances (PFAS) are a group of synthetic fluorinated organic compounds that are indispensable in various applications\, from consumer products to scientific research\, due to their unique chemical and physical properties. Recently\, these compounds have been found to be hazardous to both the environment and human health\, and their remediation poses numerous challenges due to their stability and chemical inertness. Therefore\, structural analysis of PFAS compounds is crucial to address this issue. Molecular dynamics (MD) simulations are an important tool in this regard as they allow the study of atomic behavior over time. In this work\, we have focused on fluorinated alcohols. MD simulations were performed with the liquid 2\,2\,2-trifluoroethanol system (TFE) to determine how different force fields behave in describing the properties of fluorinated compounds. We have investigated six different force fields: TRAPPE\, GROMOS-UA\, GROMOS-AA\, CHARMM\, AMBER and OPLS. The suitability of these force fields for the prediction of structural and dynamic properties was evaluated by comparing the calculated results of simulation model systems with experimental X-ray scattering data\, conformational analyses from the literature and certain thermodynamic quantities such as density and molecular diffusion coefficient. It was found that the TRAPPE\, GROMOS-UA and GROMOS-AA force fields better describe the intermolecular correlations\, while CHARMM\, AMBER and OPLS are better suited to describe the intramolecular characteristics of TFE. The latter more accurately predicted the conformational forms of the molecules (gauche vs. trans)\, which we observed from the intramolecular spatial distribution functions and the average molecular end-to-end distances. On the other hand\, the position of the maximum of the theoretical scattering curves was in better agreement with the experimental peak with the TRAPPE\, GROMOS-UA and GROMOS-AA force fields.\nhttps://indico.ijs.si/event/2338/
URL:https://web-f1.ijs.si/event/katarina-kokalj-structural-analysis-of-partially-fluorinated-liquid-ethanol/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241105T100000
DTEND;TZID=Europe/Ljubljana:20241105T110000
DTSTAMP:20260403T233200
CREATED:20241013T095013Z
LAST-MODIFIED:20241105T095058Z
UID:40657-1730800800-1730804400@web-f1.ijs.si
SUMMARY:Emanuela Bianchi\, "Modeling and simulating heterogeneously charged particles: from materials design to biological phenomena"
DESCRIPTION:Globular proteins and recently synthesized colloids engineered with differently charged surface regions share a direction-dependent interaction characterized by a reduced bonding valence and a competition between like-charge attraction and opposite-charge repulsion. Understanding the large-scale behavior of heterogeneously charged particles is thus critical for exploring both biological processes\, such as the liquid-liquid phase separation of globular proteins\, and the assembly of target structures with specific properties at the nano- and micro-scale. Recently\, we developed a simple coarse-grained model that\, within well-defined limits\, accurately reproduces the reference electrostatic potential derived from the linearized Poisson-Boltzmann framework . This model is straightforward to implement in Monte Carlo and Molecular Dynamics (MD) simulations\, enabling the exploration of how varying parameters — such as net particle charge and surface charge pattern — affect the self-assembly of these particles.As illustrative examples\, I will present our findings on how non-uniform electrostatics at the particle surface can influence the self-assembly of ordered phases  as well as the liquid-liquid phase separation . Soft Matter\, 7\, 8313 (2011)\, J.Chem. Phys.\, 142\, 114905 (2015) Nanoscale\, 9\, 1956 (2017)\, Current Opinion in Colloid & Interface Science\, 30\, 18 (2017) arXiv:2401.10655\, Soft Matter\, 20\, 7601(2024)\nhttps://indico.ijs.si/event/2461/
URL:https://web-f1.ijs.si/event/emanuela-bianchi-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20241107T150000
DTEND;TZID=Europe/Ljubljana:20241107T160000
DTSTAMP:20260403T233200
CREATED:20240809T004152Z
LAST-MODIFIED:20240924T072833Z
UID:34370-1730991600-1730995200@web-f1.ijs.si
SUMMARY:Yannick Dengler: Scattering of dark pions
DESCRIPTION:https://indico.ijs.si/event/2168/
URL:https://web-f1.ijs.si/event/yannick-dengler-scattering-of-dark-pions/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
END:VCALENDAR