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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:20260329T010000
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BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260122T110000
DTEND;TZID=Europe/Ljubljana:20260122T120000
DTSTAMP:20260403T200932
CREATED:20251202T145925Z
LAST-MODIFIED:20260122T102113Z
UID:80466-1769079600-1769083200@web-f1.ijs.si
SUMMARY:Sofie Martins: Computing cross-sections from the lattice — A recent shift in lattice thinking paradigms?
DESCRIPTION:Extracting scattering amplitudes — and consequently cross-sections — from non-perturbative lattice techniques has seen significant advances in recent years. People have so far relied on Luescher’s method\, which relates Euclidean finite-volume effects of lattice correlators to infinite-volume Minkowskian Scattering Amplitudes. While this method has achieved enormous success\, its limitations are somewhat discouraging: the invalidity beyond the inelastic threshold limits predictions to lower-point exclusive particle-scattering processes. New lattice methods by Hansen/Bulava and Tantalo/Patella have addressed this by rethinking the computation of scattering amplitudes on the lattice in terms of spectral densities\, which we can extract from large lattices with increasing precision. These methods allow the examination of exclusive processes even above the inelastic threshold and are consequently an invaluable tool for comparing and complementing perturbative computations with lattice results.I will present preliminary results for the Hansen/Bulava method in a particularly tractable theory that models a gauge-invariant implementation of the electroweak sector.\nhttps://indico.ijs.si/event/3407/
URL:https://web-f1.ijs.si/event/sofie-martins-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260122T130000
DTEND;TZID=Europe/Ljubljana:20260122T140000
DTSTAMP:20260403T200932
CREATED:20251218T142803Z
LAST-MODIFIED:20260122T115550Z
UID:82104-1769086800-1769090400@web-f1.ijs.si
SUMMARY:Leah Rank\, "Hollow microgels: From single particle characterisation to bulk behaviour"
DESCRIPTION:Hollow microgels are elastic polymer shells easily realisable in experiments. Recent works have shown the emergence of buckling events in dilute hollow microgels under the effect of an added osmotic pressure. Here\, we perform large-scale simulations to show that these microgels at high enough packing fractions undergo spontaneous symmetry-breaking deformations ranging from single large dents to multiple indentations\, even in the absence of any externally applied stress. This self-induced buckling phenomenon is thus solely driven by interparticle crowding. We construct a phase diagram inspired by vesicle shape theories\, mapping local curvature metrics as a function of the reduced volume\, to quantify these findings\, and we also propose ways to observe the occurrence of buckling in experiments. The present results thus rationalize the deformations occurring in suspensions of micro- and nano-scale elastic shells\, offering a synthetic analogue to biological ones and allowing direct control on buckling instabilities for potential applications. Beyond materials design\, these insights may also help to describe shape regulation in natural systems such as cells and vesicles\, where similar deformations are observed.\nhttps://indico.ijs.si/event/3442/
URL:https://web-f1.ijs.si/event/lear-rank-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260129T141500
DTEND;TZID=Europe/Ljubljana:20260129T151500
DTSTAMP:20260403T200932
CREATED:20260125T214828Z
LAST-MODIFIED:20260129T140532Z
UID:85791-1769696100-1769699700@web-f1.ijs.si
SUMMARY:Urban Bren\, "Biomolecular Simulations as a Useful Tool in a Fight against Cancer"
DESCRIPTION:The lecture focuses on food safety in the context of chemical carcinogens\, which are often present in raw or thermally processed foods and\, after initial activation\, alkylate DNA\, usually guanine at position N7. Recently\, important biochemical phenomena have been discovered\, such as DNA catalysis of genetic damage\, biomolecular cooperativity\, in-vivo persistence of DNA adducts and the mutational propensity of DNA polymerases\, which still lack an adequate mechanistic explanation. To elucidate their molecular basis\, we used a range of state-of-the-art computer simulation techniques in conjunction with free energy calculations and the corresponding thermodynamic cycles. Since microwaves have been shown to catalyze numerous chemical reactions\, we are concerned about the possibility of increased reactivity of chemical carcinogens\, which also offers an explanation for why microwaves were recently classified as potentially carcinogenic by the World Health Organization. Therefore\, we considered the reactions between chemical carcinogens and DNA in the context of our recently proposed physical mechanism of microwave catalysis\, based on rotationally excited polar reaction species. Moreover\, microwave irradiation has been shown to accelerate peptide misfolding and aggregation\, processes that are generally associated with the occurrence of certain cancer types\, e.g. amyloidosis. The microwave-irradiated solution thus through rotationally excited water molecules presents a less polar and less protic medium\, thereby accelerating the harmful misfolding of peptides and their aggregation. We tested this hypothesis using molecular dynamics simulations in combination with a dedicated integrator\, which is capable of efficiently decoupling individual degrees of freedom of water molecules and connecting them with the corresponding thermostats. Furthermore\, we have used quantum chemical approaches to study the reactions between chemical carcinogens and polyphenols\, secondary metabolites from fruits and vegetables. As a general rule for preventing DNA damage\, a chemical carcinogen should react faster with a polyphenol scavenger than with DNA. Since the activation free energy represents a direct measure of reactivity\, the reaction of a chemical carcinogen with a scavenger should have a lower activation barrier than the competitive alkylation of DNA. The long-term goal is to discover natural compounds or their mixtures with high antigenotoxic activities that could\, after optimization\, serve as functional dietary supplements and thus significantly contribute to cancer prevention.\nhttps://indico.ijs.si/event/3605/
URL:https://web-f1.ijs.si/event/urban-bren-biomolecular-simulations-as-a-useful-tool-in-a-fight-against-cancer/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260130T103000
DTEND;TZID=Europe/Ljubljana:20260130T113000
DTSTAMP:20260403T200932
CREATED:20260128T140107Z
LAST-MODIFIED:20260130T101556Z
UID:86085-1769769000-1769772600@web-f1.ijs.si
SUMMARY:Aleks Smolkovič - Fast and differentiable EFT likelihoods
DESCRIPTION:The Standard Model Effective Field Theory (SMEFT) has proven to be a valuable framework for studying a broad class of models beyond the SM containing heavy degrees of freedom. The phenomenology of SMEFT can be developed systematically\, incorporating essential effects such as Renormalization Group evolution and matching onto subsequent low-energy Weak Effective Field Theories (WET)\, enabling predictions for a wide range of observables. A likelihood function for the SMEFT that compares theory predictions to experimental data can be employed to identify patterns of deviation from SM predictions\, but also to study the phenomenology of any specific model that can be matched onto SMEFT. In this talk\, we present a new open source Python package jelli – JAX-based EFT likelihoods\, which provides fast and analytically differentiable generic likelihood functions for EFT studies. We discuss a major new version of smelli – a SMEFT likelihood\, which incorporates a large number of observables\, ranging from quark and lepton flavor physics\, to Higgs physics\, electroweak precision observables\, beta decays\, and high-mass Drell-Yan tails. Running on the jelli backend\, it provides a global flavorful likelihood function for the SMEFT\, WET\, and for new physics models\, with no assumptions on the flavor structure. Thanks to its numerical efficiency and differentiability\, it opens up new avenues in exploring BSM parameter spaces.\nhttps://indico.ijs.si/event/3638/
URL:https://web-f1.ijs.si/event/aleks-smolkovic-fast-and-differentiable-eft-likelihoods/
LOCATION:F1 tea room
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260205T140000
DTEND;TZID=Europe/Ljubljana:20260205T150000
DTSTAMP:20260403T200932
CREATED:20260119T130431Z
LAST-MODIFIED:20260205T135551Z
UID:85166-1770300000-1770303600@web-f1.ijs.si
SUMMARY:Stephane Jedele\, "Enhancement of the RNA tree model"
DESCRIPTION:https://indico.ijs.si/event/3599/
URL:https://web-f1.ijs.si/event/stephane-jedele-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260212T140000
DTEND;TZID=Europe/Ljubljana:20260212T150000
DTSTAMP:20260403T200932
CREATED:20260127T151942Z
LAST-MODIFIED:20260212T134607Z
UID:85983-1770904800-1770908400@web-f1.ijs.si
SUMMARY:Toshikaze Chiba\, "Deep Learning and Large Language Models for scRNA-seq Data Analysis"
DESCRIPTION:https://indico.ijs.si/event/3637/
URL:https://web-f1.ijs.si/event/toshikaze-chiba-deep-learning-and-large-language-models-for-scrna-seq-data-analysis/
LOCATION:MPŠ Lecture Hall (Jamova)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260305T110000
DTEND;TZID=Europe/Ljubljana:20260305T120000
DTSTAMP:20260403T200932
CREATED:20260303T103839Z
LAST-MODIFIED:20260305T103720Z
UID:89438-1772708400-1772712000@web-f1.ijs.si
SUMMARY:Fabrizio Nesti: A ghost story
DESCRIPTION:https://indico.ijs.si/event/3697/
URL:https://web-f1.ijs.si/event/fabrizio-nesti-a-ghost-story/
LOCATION:F1 tea room
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260312T110000
DTEND;TZID=Europe/Ljubljana:20260312T120000
DTSTAMP:20260403T200932
CREATED:20260226T170638Z
LAST-MODIFIED:20260312T105109Z
UID:89035-1773313200-1773316800@web-f1.ijs.si
SUMMARY:Fabian Esser: Higher-dimensional SMEFT operators and UV models for neutrinoless double beta decay
DESCRIPTION:The observation of lepton number violation (LNV) would be clear evidence for physics beyond the Standard Model\, and non-zero neutrino masses particularly motivate a study of processes that violate lepton number by two units\, like e.g. neutrinoless double beta decay. In the Standard Model Effective Field Theory (SMEFT)\, a ubiquitous framework used for indirect new physics searches\, $Delta L =2$ operators appear at dimension-5 and higher odd dimensions. Focusing on dimension-9 operators\, I will present a diagram-based classification of tree-level UV models and isolate minimal two-particle models that avoid generating the dimension-5 operator or dimension-7 LNV operators at tree level. I then chart how these minimal models populate the operator landscape and organise them by the loop order at which they radiatively induce lower-dimensional LNV operators\, highlighting sce- narios in which the tree-level dimension-9 contribution can compete with or dominate loop-suppressed neutrino-mass (dimension-5) effects. Finally\, I will show representative one-loop and two- loop models\, their matching onto the SMEFT\, and their implications for neutrino masses\, charged-lepton flavour violation\, and the relative size of dimension-9 versus dimension-5 contributions to 0νββ.\nhttps://indico.ijs.si/event/3692/
URL:https://web-f1.ijs.si/event/fabian-esser/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260326T141500
DTEND;TZID=Europe/Ljubljana:20260326T151500
DTSTAMP:20260403T200932
CREATED:20260305T105353Z
LAST-MODIFIED:20260326T090552Z
UID:89642-1774534500-1774538100@web-f1.ijs.si
SUMMARY:Ana Crnković\, "Engineering protein nanopores with genetically encoded noncanonical amino acids"
DESCRIPTION:Genetic code expansion enables site-specific incorporation of noncanonical amino acids (ncAAs) into proteins\, facilitating the introduction of spectroscopic probes\, fluorescent labels\, photoreactive groups\, enhanced stability\, and novel chemical reactivity. Despite the successful incorporation of over 150 ncAAs\, the broader application of ncAAs has largely remained limited to proof-of-principle studies. In this lecture\, I will discuss key factors that govern the efficient incorporation of ncAAs to achieve high yields of target proteins\, with particular emphasis on challenging systems such as phosphoproteins and selenoproteins. In the second part\, I will highlight how selected ncAAs are utilized in our group to engineer protein nanopores for biosensing applications – a technique that detects analytes by monitoring changes in ionic current as molecules translocate through a nanopore under an applied voltage. Overall\, this lecture aims to highlight the potential of ncAAs to unlock new functionalities in various protein targets and to inspire their broader use in emerging techniques.\nhttps://indico.ijs.si/event/3701/
URL:https://web-f1.ijs.si/event/ana-crnkovic/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260409T141500
DTEND;TZID=Europe/Ljubljana:20260409T151500
DTSTAMP:20260403T200933
CREATED:20260121T104638Z
LAST-MODIFIED:20260403T000533Z
UID:85353-1775744100-1775747700@web-f1.ijs.si
SUMMARY:Jure Dobnikar\, "DNA packing in viral capsids"
DESCRIPTION:Assembly of viral capsids containing genetic material\, is a key process in viral reproduction cycle. The bacteriophages and double stranded DNA viruses assemble their capsids prior to genome packaging and actively push DNA inside by ATP-driven packaging motors. The genome is typically densely packed in the capsid and understanding its spatial configuration presents a challenging problem\, which is not completely understood despite its obvious importance.\nTo elucidate the mechanism of DNA packing\, we first explored a simple model of elastic filament confined to a sphere with three competing interactions . The simple phenomenological theory supported by extensive parallel tempering MD simulations of the wormlike chain (WLC) model show that the optimal ground state packing is not an inverse spool configuration as previously assumed; it is a more complex structure where the filament is compartmentalized into multiple domains\, resembling nested tori or topological links. While this suggests that DNA will also form multidomain structures in a viral capsid\, it is important to realize that DNA cannot be completely described by the linear elastic model. Under sufficient local torsion\, the base pairs of the double helix can locally melt creating regions with large flexibility that can easily form kinks. We incorporated this effect into a meltable WLC model and explored nonequilibrium process of pushing such kinkable chains into a capsid by molecular motors . It turns out that the kink formation crucially affects the structure: for sufficiently slow packing process we observe a coexistence of outer spool domain and a twisted nematic core – in a perfect agreement with available cryo-EM experimental observations. Our findings suggest that the nonlinear elasticity of biological molecules plays an important role in their spatial structuring in confined biological systems. \nReferences\n T. Curk\, J.D. Farrell\, J. Dobnikar\, R. Podgornik\, Spontaneous Domain Formation in Spherically Confined Elastic Filaments\, Phys. Rev. Lett. 123 047801 (2019)\n J.D. Farrell\, J. Dobnikar\, R. Podgornik\, T. Curk: Spool-nematic ordering of dsDNA and dsRNA under confinement\, Phys. Rev. Lett. 133 148101 (2024)\nhttps://indico.ijs.si/event/3601/
URL:https://web-f1.ijs.si/event/jure-dobnikar-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260416T110000
DTEND;TZID=Europe/Ljubljana:20260416T120000
DTSTAMP:20260403T200933
CREATED:20260331T135030Z
LAST-MODIFIED:20260403T180545Z
UID:92122-1776337200-1776340800@web-f1.ijs.si
SUMMARY:Rishav Roshan: Gravitational wave production during reheating: From the inflaton to primordial black holes
DESCRIPTION:We calculate the gravitational waves (GWs) produced by primordial black holes (PBHs) in the presence of the inflaton condensate in the early Universe. Combining the GW production from the evaporation process\, the gravitational scattering of the inflaton itself\, and the density fluctuations due to the inhomogeneous distribution of PBHs\, we propose for the first time a complete\, coherent analysis of the spectrum\, revealing three peaks\, one for each source. Three frequency ranges (~kHz\, GHz\, and PHz\, respectively) are expected\, each giving rise to a similar GW peak amplitude Ω_GW. We also compare our predictions with current and future GW detection experiments.\nhttps://indico.ijs.si/event/3730/
URL:https://web-f1.ijs.si/event/rishav-roshan-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260507T110000
DTEND;TZID=Europe/Ljubljana:20260507T120000
DTSTAMP:20260403T200933
CREATED:20260401T125324Z
LAST-MODIFIED:20260403T180545Z
UID:92208-1778151600-1778155200@web-f1.ijs.si
SUMMARY:Elie Hammou: Tailored PDFs for new physics searches
DESCRIPTION:https://indico.ijs.si/event/3731/
URL:https://web-f1.ijs.si/event/elie-hammou-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260514T141500
DTEND;TZID=Europe/Ljubljana:20260514T151500
DTSTAMP:20260403T200933
CREATED:20260213T000325Z
LAST-MODIFIED:20260403T000533Z
UID:87650-1778768100-1778771700@web-f1.ijs.si
SUMMARY:Andraž Stožer & Marko Gosak (TBA)
DESCRIPTION:https://indico.ijs.si/event/3643/
URL:https://web-f1.ijs.si/event/andraz-stozer-marko-gosak-tba/
LOCATION:Seminar room of physics (106) (IJS)
END:VEVENT
END:VCALENDAR