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X-ORIGINAL-URL:https://web-f1.ijs.si
X-WR-CALDESC:Events for Department of Theoretical Physics
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TZID:Europe/Ljubljana
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TZOFFSETFROM:+0100
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DTSTART:20250330T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20250508T141500
DTEND;TZID=Europe/Ljubljana:20250508T151500
DTSTAMP:20260423T024726
CREATED:20250405T000101Z
LAST-MODIFIED:20250508T124927Z
UID:56616-1746713700-1746717300@web-f1.ijs.si
SUMMARY:Angelo Rosa\, "Configurational entropy of random trees"
DESCRIPTION:In this talk\, I will illustrate two recent results of our group concerning the statistical physics of branched polymers. In the first part\, I will present a graph theoretical approach to the configurational statistics of random tree-like objects\, which is based on Prüfer labelling. The method\, in particular\, provides: (i) direct access to the exact configurational entropy as a function of the tree composition\, (ii) computable exact expressions for partition functions and important experimental observables for tree ensembles with controlled branching activity and (iii) an efficient sampling scheme for corresponding tree configurations and arbitrary static properties. Then\, in the second part\, I will introduce a field-theoretic framework for branched polymers with excluded volume interactions. By solving the corresponding partition function by mean-field methods\, I will show that the theory is in semi-quantitative agreement with Monte-Carlo computer simulations.\nhttps://indico.ijs.si/event/2878/
URL:https://web-f1.ijs.si/event/angelo-rosa-tba/
LOCATION:Seminar room of physics (106) (IJS)
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20250520T153000
DTEND;TZID=Europe/Ljubljana:20250520T163000
DTSTAMP:20260423T024726
CREATED:20250506T123546Z
LAST-MODIFIED:20250520T141232Z
UID:59737-1747755000-1747758600@web-f1.ijs.si
SUMMARY:Marko Malezic: Toward Efficient Trotter-Suzuki Schemes for Long-Time Quantum Dynamics
DESCRIPTION:Accurately simulating long-time dynamics of quantum many-body systems—whether in real or imaginary time—is a challenge in both classical and quantum computing due to the accumulation of Trotter errors. While low-order Trotter-Suzuki decompositions are straightforward to implement\, their rapidly growing error limits access to long-time observables and ground state properties. I will present a framework for constructing efficient high-order Trotter-Suzuki schemes by identifying their structure and directly optimizing their parameters over a high-dimensional space. This method enables the discovery of new schemes with significantly improved efficiency compared to traditional constructions\, such as those by Suzuki and Yoshida. I will demonstrate the effectiveness of these decompositions on the Heisenberg XXZ model\, comparing their performance and presenting the newly discovered schemes. Finally\, I will discuss ongoing efforts to extend this framework to even higher orders and apply the derived schemes to quantum hardware\, pushing the boundaries of both theoretical advancements and practical quantum computing.\nhttps://indico.ijs.si/event/2921/
URL:https://web-f1.ijs.si/event/marko-malezic/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20250529T140000
DTEND;TZID=Europe/Ljubljana:20250529T150000
DTSTAMP:20260423T024726
CREATED:20250424T114250Z
LAST-MODIFIED:20250529T121457Z
UID:58577-1748527200-1748530800@web-f1.ijs.si
SUMMARY:Anže Božič\, "Complexity of RNA sequences"
DESCRIPTION:https://indico.ijs.si/event/2913/
URL:https://web-f1.ijs.si/event/anze-bozic-complexity-of-rna-sequences/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20250529T153000
DTEND;TZID=Europe/Ljubljana:20250529T163000
DTSTAMP:20260423T024726
CREATED:20250406T185155Z
LAST-MODIFIED:20250529T140433Z
UID:56798-1748532600-1748536200@web-f1.ijs.si
SUMMARY:Motoo Suzuki: Small Instantons and the Post-Inflationary QCD Axion in a Special Product GUT
DESCRIPTION:In this talk\, after some review of axion physics\, I would like to discuss our recent work about a new framework of grand unification that is equipped with an axion solution to the strong CP problem without a domain wall problem when the Peccei–Quinn (PQ) symmetry is spontaneously broken after inflation. Our grand unified theory (GUT) is based on a symmetry breaking pattern\, SU(10) ×SU(5)1 →SU(5)V ⊃SU(3)C ×SU(2)L ×U(1)Y\, where SU(5)1 and a special embedding of SU(5)2 ⊂SU(10) are broken to a diagonal subgroup SU(5)V. The model contains a vector-like pair of PQ-charged fermions that transform as (anti-)fundamental representations under SU(10)\, so that the domain wall number is one. However\, after the GUT symmetry breaking\, the number of vector-like pairs of PQ-charged colored fermions is larger than one\, which seems to encounter the domain wall problem. This apparent inconsistency is resolved by small instanton effects on the axion potential which operate as a PQ-violating bias term and allow the decay of domain walls. We propose a domain-wall-free UV completion for an IR model where the domain wall number appears larger than one. The model gives a prediction for a dark matter axion window\, which is different from that of the ordinary post-inflationary QCD axion with domain wall number one.\nhttps://indico.ijs.si/event/2901/
URL:https://web-f1.ijs.si/event/motoo-suzuki/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (A/1-106 – Seminarska soba fizike (F5))
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