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DTSTART;TZID=Europe/Berlin:20260120T150000
DTEND;TZID=Europe/Berlin:20260120T150000
DTSTAMP:20260503T231952
CREATED:20260117T130818Z
LAST-MODIFIED:20260117T131351Z
UID:10000127-1768921200-1768921200@www.trr352.de
SUMMARY:On the asymptotic behavior at the kinetic time of a weakly interacting Fermi gas
DESCRIPTION:Describing the long-time dynamical behaviour of quantum systems is a long-standing open problem. \nWhen the coupling constant  of the interaction is small\, the dynamics of the system up to kinetic time  is conjectured to be effectively governed by the Boltzmann-Nordheim kinetic equation. \nIn this talk\, I will present a result on the two-point time correlation function of a system of lattice fermions at thermal equilibrium\, and I will explain how to approach the problem using a perturbation expansion and representing the appearing terms by Feynman diagrams. \nThis is joint work with Phan Thành Nam\, Herbert Spohn\, and Minh-Binh Tran.
URL:http://www.trr352.de/event/on-the-asymptotic-behavior-at-the-kinetic-time-of-a-weakly-interacting-fermi-gas/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Junior Coffee Breaks
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260209T160000
DTEND;TZID=Europe/Berlin:20260209T160000
DTSTAMP:20260503T231952
CREATED:20251223T121749Z
LAST-MODIFIED:20260129T191257Z
UID:10000125-1770652800-1770652800@www.trr352.de
SUMMARY:A probabilistic approach to BEC
DESCRIPTION:A gas of interacting Bosons can be represented using an ensemble of stochastic diffusions – a Brownian loop soup. In this talk\, we review the construction of this Feynman representation\, its representation of Free Energy and the 1-PRDM. We also introduce some results from the literature in the dilute and other regimes and state some conjectures.
URL:http://www.trr352.de/event/a-probabilistic-approach-to-bec/
LOCATION:Room 5612.EG.019 (CIT Sitzungsraum 2)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Junior Coffee Breaks
ORGANIZER;CN="Quirin Vogel":MAILTO:Quirin.Vogel@aau.at
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260511T160000
DTEND;TZID=Europe/Berlin:20260511T170000
DTSTAMP:20260503T231952
CREATED:20260422T191046Z
LAST-MODIFIED:20260422T191046Z
UID:10000135-1778515200-1778518800@www.trr352.de
SUMMARY:Stable matrix product state simulations with BUGs
DESCRIPTION:Tensor networks have become a standard computational tool for simulating quantum many-body dynamics. Their time evolution requires the efficient and accurate update of low-rank tensor factors. In recent years\, several new numerical schemes have been proposed for this task. All these methods can be understood within the unified framework of Basis Update and Galerkin (BUG) integrators\, in which the basis matrices are evolved by low-dimensional matrix differential equations\, while the core tensors are updated through a Galerkin projection step. \nWe begin with an introduction to matrix product states\, also known as tensor trains in the mathematical literature. Further\, it will introduce the basic ideas behind the BUG integrator. Particular emphasis will be placed on their remarkable properties like rank-adaptivity\, parallelism and the preservation of physical invariants such as norm and energy. Numerical experiments from quantum physics will demonstrate the theoretical results and explore the potential of BUG integrators for large-scale many-body quantum systems.
URL:http://www.trr352.de/event/stable-matrix-product-state-simulations-with-bugs/
LOCATION:Room 5612.03.020 (Besprechungsraum)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Junior Coffee Breaks
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