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X-WR-CALNAME:SFB TRR 352
X-ORIGINAL-URL:http://www.trr352.de
X-WR-CALDESC:Events for SFB TRR 352
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TZID:Europe/Berlin
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TZOFFSETFROM:+0100
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DTSTART:20230326T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241216T143000
DTEND;TZID=Europe/Berlin:20241216T143000
DTSTAMP:20260504T064436
CREATED:20250703T141417Z
LAST-MODIFIED:20250703T141417Z
UID:10000049-1734359400-1734359400@www.trr352.de
SUMMARY:The hypergraph removal process
DESCRIPTION:Fix some graph or uniform hypergraph F and then consider the following simple process:\nstart with a large complete (hyper)graph Kn on n vertices and iteratively remove (the edge set of) copies of F as long as possible; each selection is made uniformly among all present copies of F at that time. This process is known as the F-removal process. The determination of the termination time (how many edges are left when the process terminates) is the key question regarding this process. This question has proven to be highly challenging. Bohman\, Frieze and Lubetzky famously proved in 2015 that the triangle-removal process (F is a triangle) typically terminates with n3/2+o(1) edges. For no other (hyper)graph F has the termination of the F-removal process been established. We determine when the F-removal process ends for all “sensible” choices of F; this includes cliques\, for which a major folklore conjecture in this area predicts the termination time.\nThis is joint work with Marcus Kühn.
URL:http://www.trr352.de/event/the-hypergraph-removal-process/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241216T143000
DTEND;TZID=Europe/Berlin:20241216T143000
DTSTAMP:20260504T064436
CREATED:20250703T141233Z
LAST-MODIFIED:20250703T141233Z
UID:10000048-1734359400-1734359400@www.trr352.de
SUMMARY:Phase diagram of the loop O(n) model
DESCRIPTION:Phase transitions are natural phenomena in which a small change in an external parameter\, like temperature or pressure\, causes a dramatic change in the qualitative structure of the object. To study this\, many scientists (such as Nobel laureates Pauling and Flory) proposed the abstract framework of lattice models. The focus of this talk is on the loop O(n) model on the hexagonal lattice. Among its particular cases are percolation\, Ising model\, self-avoiding walk\, dimers\, integer-valued Lipschitz functions\, proper 4-colourings and others. The loop O(n) model has attracted a lot of attention due to its rich phase diagram that includes a large region of parameters with an expected conformally invariant scaling limit. The model is difficult to study due to the lack of monotonicity with respect to parameters: each point of the phase diagram should be treated separately. In particular\, existence of macroscopic loops has been established only recently in several sparse regions of parameters. I will present a unifying approach that applies to all n between 1 and 2. Main tools: novel graphical representation\, Benjamini—Schramm limit\, XOR argument (aka arXiv:2001.11977) and a new bound on a percolation threshold (due to Harel and Zelesko). This is joint work with Matan Harel (Northeastern).
URL:http://www.trr352.de/event/phase-diagram-of-the-loop-on-model/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241216T000000
DTEND;TZID=Europe/Berlin:20241220T235959
DTSTAMP:20260504T064436
CREATED:20250604T121603Z
LAST-MODIFIED:20250604T121603Z
UID:10000013-1734307200-1734739199@www.trr352.de
SUMMARY:Correlations of Quantum Many-Body Systems
DESCRIPTION:
URL:http://www.trr352.de/event/correlations-of-quantum-many-body-systems/
LOCATION:Department of Mathematics\, Room N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Workshops/Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241215T000000
DTEND;TZID=Europe/Berlin:20241220T235959
DTSTAMP:20260504T064436
CREATED:20250604T122049Z
LAST-MODIFIED:20250604T122049Z
UID:10000014-1734220800-1734739199@www.trr352.de
SUMMARY:Mathematical Physics and PDEs
DESCRIPTION:
URL:http://www.trr352.de/event/mathematical-physics-and-pdes/
LOCATION:Haus der bayerischen Landwirtschaft\, Rieder Str. 70\, Herrsching am Ammersee\, 82211\, Germany
CATEGORIES:Workshops/Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241212T163000
DTEND;TZID=Europe/Berlin:20241212T163000
DTSTAMP:20260504T064436
CREATED:20250703T141555Z
LAST-MODIFIED:20250703T141555Z
UID:10000050-1734021000-1734021000@www.trr352.de
SUMMARY:Landau damping
DESCRIPTION:Of great interest in plasma physics is to determine whether excited charged particles in a non-equilibrium state will relax to neutrality or transition to a nontrivial coherent state. Due to the long range interaction between particles\, the self-consistent generating electric field oscillates in time and disperses in space like a Klein-Gordon wave\, known in the physical literature as plasma oscillations or Langmuir’s oscillatory waves. Landau in his original work addresses the decay of such an electric field\, namely the energy exchange between the oscillatory electric field and charged particles\, in a linearized setting. This talk will provide an overview of the recent mathematical advances in the nonlinear setting. The talk should be accessible to graduate students and the general audience.
URL:http://www.trr352.de/event/landau-damping/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241210T160000
DTEND;TZID=Europe/Berlin:20241210T160000
DTSTAMP:20260504T064436
CREATED:20250404T185700Z
LAST-MODIFIED:20250404T190105Z
UID:10000011-1733846400-1733846400@www.trr352.de
SUMMARY:Mathematical Advances in BCS Theory of Superconductivity
DESCRIPTION:Bardeen-Cooper-Schrieffer (BCS) theory is a successful model of superconductivity. In this talk\, I will begin by providing an overview of how BCS theory connects with other models of superconductivity\, highlighting major open questions and recent developments in the field. Second\, I will explain recent results on the critical temperature in the presence of a boundary in more detail.
URL:http://www.trr352.de/event/mathematical-advances-in-bcs-theory-of-superconductivity/
LOCATION:Seminar Room\, 4th floor\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Junior Coffee Breaks
ORGANIZER;CN="Dr. Barbara Roos":MAILTO:barbara.roos@uni-tuebingen.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241204T160000
DTEND;TZID=Europe/Berlin:20241204T160000
DTSTAMP:20260504T064436
CREATED:20250703T142205Z
LAST-MODIFIED:20250703T142205Z
UID:10000051-1733328000-1733328000@www.trr352.de
SUMMARY:Rapid thermalisation of quantum dissipative many-body systems
DESCRIPTION:Quantum systems typically reach thermal equilibrium when in weak contact with a large external bath. Understanding the speed of this thermalisation is a challenging problem\, especially in the context of quantum many-body systems where direct calculations are intractable. The usual way of bounding the speed of this process is by estimating the spectral gap of the dissipative generator\, but this does not always yield a reasonable estimate for the thermalisation time. When the system satisfies instead a modified logarithmic Sobolev inequality (MLSI)\, the thermalisation time is at most logarithmic in the system size\, yielding wide-ranging applications to the study of many-body in and out-of-equilibrium quantum systems\, such as stability against local perturbations (in the generator)\, efficient preparation of Gibbs states (the equilibria of these processes)\, etc. \nIn this talk\, I will present an overview on a strategy to prove that a system satisfies a MLSI provided that correlations decay sufficiently fast between spatially separated regions on the Gibbs state of a local\, commuting Hamiltonian in any dimension. I will subsequently review the current state of the art for Davies dissipative generators thermalising to such Gibbs states.
URL:http://www.trr352.de/event/rapid-thermalisation-of-quantum-dissipative-many-body-systems/
LOCATION:Room 5610.EG.011 (CIT Sitzungsraum 1)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241128T160000
DTEND;TZID=Europe/Berlin:20241128T160000
DTSTAMP:20260504T064436
CREATED:20250704T071829Z
LAST-MODIFIED:20250829T134650Z
UID:10000052-1732809600-1732809600@www.trr352.de
SUMMARY:Semi-classical limit in Quantum mechanics: Dynamics and Beyond
DESCRIPTION:
URL:http://www.trr352.de/event/semi-classical-limit-in-quantum-mechanics-dynamics-and-beyond/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241119T161500
DTEND;TZID=Europe/Berlin:20241119T161500
DTSTAMP:20260504T064436
CREATED:20250707T133348Z
LAST-MODIFIED:20250829T140629Z
UID:10000106-1732032900-1732032900@www.trr352.de
SUMMARY:Quantum Advantage in Games of Incomplete Information
DESCRIPTION:Competitive games of complete information famously always have Nash equilibria\, but it is well-known that correlation (“advice”) can yield new equilibria\, sometimes with preferable collective properties (social welfare\, fairness\, …). While it is known that quantum correlations in the form of entanglement do not imply further correlated equilibria\, this situation changes when going to so-called Bayesian games of incomplete information\, where each player has to react to a privately known type\, while being ignorant about the type of the other players. \nIn fact\, when all players in the game share the same payoff function\, this reproduces the “nonlocal games” studied in quantum mechanics since Bell\, in which case the CHSH inequality separates classical from quantum correlation and quantum from no-signalling. \nIn the talk\, I will review\, how classical correlations\, shared quantum states and no-signalling correlations can create a hierarchy of sets of classically correlated\, quantum and belief-invariant equilibria of conflict-of-interest games\, all containing the set of Nash equilibria. I will show a simple and easy-to-analyze construction of such games based on quantum pseudo-telepathy games\, which show the quantum advantage of larger social welfare and of fairer distribution of payoff. \n[Based on work with V. Auletta\, D. Ferraioli\, A. Rai and G. Scarpa\, arXiv:1605.07896\,  and with M. Cerda (BSc thesis\, UAB 2021).]
URL:http://www.trr352.de/event/quantum-advantage-in-games-of-incomplete-information/
LOCATION:Room 5601.EG.001 (Magistrale)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241113T190000
DTEND;TZID=Europe/Berlin:20241113T190000
DTSTAMP:20260504T064436
CREATED:20250704T072528Z
LAST-MODIFIED:20250704T072528Z
UID:10000053-1731524400-1731524400@www.trr352.de
SUMMARY:Around Segal Axioms for QFT: construction and interpretations
DESCRIPTION:
URL:http://www.trr352.de/event/around-segal-axioms-for-qft-construction-and-interpretations/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Talks
ORGANIZER;CN="Jiasheng Lin":MAILTO:jiasheng.lin@imj-prg.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241113T180000
DTEND;TZID=Europe/Berlin:20241113T180000
DTSTAMP:20260504T064436
CREATED:20250704T072901Z
LAST-MODIFIED:20250704T072901Z
UID:10000054-1731520800-1731520800@www.trr352.de
SUMMARY:Lagrange\, Euler\, Hooke\, and Cauchy
DESCRIPTION:
URL:http://www.trr352.de/event/lagrange-euler-hooke-and-cauchy/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241107T160000
DTEND;TZID=Europe/Berlin:20241107T160000
DTSTAMP:20260504T064436
CREATED:20250704T073450Z
LAST-MODIFIED:20250904T103351Z
UID:10000055-1730995200-1730995200@www.trr352.de
SUMMARY:How to represent a function in a quantum computer
DESCRIPTION:Quantum Signal Processing (QSP) is an algorithmic process by which one represents a signal $f: [0\,1] \to (-1\,1)$ as the upper left entry of a product of $SU(2)$ matrices parametrized by the input variable $x \in [0\,1]$ and some ”phase factors” $\{\psi_k\}_{k \geq 0}$ depending on $f$. We show that\, after a change of variables\, QSP is actually the SU(2)-valued nonlinear Fourier transform\, and the phase factors $\{\psi_k\}_k$ correspond to the nonlinear Fourier coefficients. By exploiting a nonlinear Plancherel identity and using some basic spectral theory\, we then show that a QSP representation exists for every $f$ satisfying the log integrability condition \[ \int\limits_{0} ^1 \log (1-f(x)^2) \frac{dx}{\sqrt{1-x^2}} > – \infty \\, . \]
URL:http://www.trr352.de/event/how-to-represent-a-function-in-a-quantum-computer/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241107T000000
DTEND;TZID=Europe/Berlin:20241108T235959
DTSTAMP:20260504T064436
CREATED:20250604T122418Z
LAST-MODIFIED:20250604T122418Z
UID:10000015-1730937600-1731110399@www.trr352.de
SUMMARY:Eigenvalue estimates for Laplace and Schrödinger operators
DESCRIPTION:
URL:http://www.trr352.de/event/eigenvalue-estimates-for-laplace-and-schrodinger-operators/
LOCATION:University of Stuttgart\, Seminarraum des IADM 8.122\, Pfaffenwaldring 57\, Stuttgart\, 70569\, Germany
CATEGORIES:Workshops/Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241105T180000
DTEND;TZID=Europe/Berlin:20241105T180000
DTSTAMP:20260504T064436
CREATED:20250704T073809Z
LAST-MODIFIED:20250704T073809Z
UID:10000056-1730829600-1730829600@www.trr352.de
SUMMARY:Weyl asymptotics for Lipschitz domains
DESCRIPTION:
URL:http://www.trr352.de/event/weyl-asymptotics-for-lipschitz-domains/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241105T161500
DTEND;TZID=Europe/Berlin:20241105T161500
DTSTAMP:20260504T064436
CREATED:20250704T074153Z
LAST-MODIFIED:20250704T074153Z
UID:10000057-1730823300-1730823300@www.trr352.de
SUMMARY:Quantum Walks: Their basic properties and dynamical localization
DESCRIPTION:Quantum walks (QWs) can be viewed as quantum analogs of classical random walks. Mathematically\, a QW is described as a unitary\, local operator acting on a grid and can be written as a product of shift and coin operators. We highlight differences to classical random walks and stress their connection to quantum algorithms (see Grover’s algorithm). If the QW is assumed to be translation invariant\, applying the Fourier transform yields a multiplication operator\, whose bandstructure we briefly study. After equipping the underlying lattice with random phases\, we turn to dynamical localization. This means that the probability to move from one lattice site to another decreases on average exponentially in the distance\, independently of how many steps the QW may take. We sketch the proof of dynamical localization on the hexagonal lattice in the regime of strong disorder\, which uses a finite volume method.
URL:http://www.trr352.de/event/quantum-walks-their-basic-properties-and-dynamical-localization/
LOCATION:Room 5608.03.011 (Seminarraum (M1/M7))\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241022T160000
DTEND;TZID=Europe/Berlin:20241022T160000
DTSTAMP:20260504T064436
CREATED:20250704T074401Z
LAST-MODIFIED:20250704T074401Z
UID:10000058-1729612800-1729612800@www.trr352.de
SUMMARY:DOS of Random Schrödinger Operators with negatively correlated Cauchy Distribution
DESCRIPTION:We study the generalised Lloyd model\, that is\, a random Schrödinger operator on the lattice Zd of the form H = −∆ + λV\, λ > 0\, with Vi = ∑j Tij Wj where Wj ∼ Cauchy(0\, 1) are iid random variables. If all coeffi- cients Tij are non-negative one can find an exact formula for the density of states (DOS) with the help of supersymmetry (SUSY). However\, the case of negative coefficients remains largely unexplored. To illustrate the complexities involved\, we study a simple model where only two lattice sites are negatively correlated. This model was already considered in a recent work of Disertori and Lager (MPAG2020)\, but here we develop a novel approach based on the regularisation of the distribu- tion of V . We derive the leading order expression for the DOS and recover the asymptote for the correction as the correlation strength is sent to zero. Finally\, I present my progress in extending these results to a model of infinitely many pairs of negative correlation which are well separated and placed periodically in Zd.
URL:http://www.trr352.de/event/dos-of-random-schrodinger-operators-with-negatively-correlated-cauchy-distribution/
LOCATION:Room 5608.03.011 (Seminarraum (M1/M7))\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241010T000000
DTEND;TZID=Europe/Berlin:20241012T235959
DTSTAMP:20260504T064436
CREATED:20250604T125446Z
LAST-MODIFIED:20250604T125446Z
UID:10000016-1728518400-1728777599@www.trr352.de
SUMMARY:Mini-Workshop on Condensed Matter Physics
DESCRIPTION:
URL:http://www.trr352.de/event/mini-workshop-on-condensed-matter-physics/
LOCATION:Explorer Hotel Garmisch and LMU Munich
CATEGORIES:Workshops/Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241006T000000
DTEND;TZID=Europe/Berlin:20241010T235959
DTSTAMP:20260504T064436
CREATED:20250707T135241Z
LAST-MODIFIED:20260213T122414Z
UID:10000112-1728172800-1728604799@www.trr352.de
SUMMARY:Annual Retreat
DESCRIPTION:The CRC’s Annual Retreat was held from October 6–10\, 2024\, at the Explorer Hotel Garmisch in Farchant. Nearly 60 members\, including both established researchers and early-career scientists\, gathered for a productive few days. \nEach morning\, project teams presented brief talks and posters\, providing valuable insights into their research. The afternoons featured engaging discussions\, and participants had the opportunity to explore the beautiful surroundings of the Alps. \nOn Wednesday morning\, we recognized outstanding contributions to our field. M. Christiansen received the award for the best postdoctoral research paper\, while D. Sulz and A. Lauritsen were honored for their exceptional PhD research papers. \nWe appreciate everyone’s participation and look forward to another successful year of research ahead. \nProgram \nProgram Annual Retreat 2024\n  \nPoster \nA1_Meng_Siedentop\nA2_Pfeiffer\nA3_Chan\nA4_Triay\nA5_Phan\nA6_Lauritsen\nA7_Warzel\nA8_Lemm\nA9_Müller\nB1_Schlein\nB5_Lasser_Mendl_Schwarze\nB6_König\nB8_Teufel
URL:http://www.trr352.de/event/annual-retreat/
LOCATION:Explorer Hotel Garmisch\, Frickenstraße 22\, Farchant\, 82490\, Germany
CATEGORIES:Retreats
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240730T000000
DTEND;TZID=Europe/Berlin:20240801T235959
DTSTAMP:20260504T064436
CREATED:20250605T114343Z
LAST-MODIFIED:20250605T114343Z
UID:10000017-1722297600-1722556799@www.trr352.de
SUMMARY:Solid Math 2024
DESCRIPTION:
URL:http://www.trr352.de/event/solid-math-2024/
LOCATION:University of Tübingen\, Geschwister-Scholl-Platz\, Tübingen\, 72074\, Germany
CATEGORIES:Workshops/Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240722T000000
DTEND;TZID=Europe/Berlin:20240726T235959
DTSTAMP:20260504T064436
CREATED:20250618T103547Z
LAST-MODIFIED:20250618T103657Z
UID:10000028-1721606400-1722038399@www.trr352.de
SUMMARY:Summer School on Current Topics in Mathematical Physics
DESCRIPTION:
URL:http://www.trr352.de/event/summer-school-on-current-topics-in-mathematical-physics/
LOCATION:University of Zurich\, Rämistrasse 71\, Zürich\, 8006\, Switzerland
CATEGORIES:Schools
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240718T121500
DTEND;TZID=Europe/Berlin:20240718T121500
DTSTAMP:20260504T064436
CREATED:20250704T075338Z
LAST-MODIFIED:20250704T075530Z
UID:10000059-1721304900-1721304900@www.trr352.de
SUMMARY:Introduction to Modelling Molecular Observables and Spectral Responses
DESCRIPTION:This talk will provide a partial overview of how to model molecular observables and spectral responses. We shall start with the essential quantum mechanical concepts and formalisms that are used in theoretical chemistry and molecular physics. This will be followed by an illustration of the tools that are involved in numerical simulations in this context.
URL:http://www.trr352.de/event/introduction-to-modelling-molecular-observables-and-spectral-responses/
LOCATION:Room 03.10.011\, Boltzmannstr. 3\, Garching Forschungszentrum\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240715T150000
DTEND;TZID=Europe/Berlin:20240715T150000
DTSTAMP:20260504T064436
CREATED:20250704T080124Z
LAST-MODIFIED:20250704T080124Z
UID:10000061-1721055600-1721055600@www.trr352.de
SUMMARY:Fluctuations in the dilute Curie-Weiss model
DESCRIPTION:The dilute Curie-Weiss model is the Ising model on a (dense) Erdös-Rényi graph G(N\,p). It was introduced by Bovier and Gayrard in 1990s. There the authors showed that on the level of laws of large numbers the magnetization as well as the free energy behave as they do in the usual Curie-Weiss model (i.e. mean-field Ising model). We analyze CLTs for the these quantities and give several critical values for p at which these fluctuations change. This is joint work with Zakhar Kabluchko and Kristina Schubert.
URL:http://www.trr352.de/event/fluctuations-in-the-dilute-curie-weiss-model/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240715T150000
DTEND;TZID=Europe/Berlin:20240715T150000
DTSTAMP:20260504T064436
CREATED:20250704T075811Z
LAST-MODIFIED:20250704T075811Z
UID:10000060-1721055600-1721055600@www.trr352.de
SUMMARY:Branching Brownian motion\, branching random walks\, and the Fisher-KPP equation in spatially random environment
DESCRIPTION:Branching Brownian motion\, branching random walks\, and the F-KPP equation have been the subject of intensive research during the last couple of decades. By means of Feynman-Kac and McKean formulas\, the understanding of the maximal particles of the former two Markov processes is related to insights into the position of the front of the solution to the F-KPP equation. We will discuss some recent result on extensions of the above models to spatially random branching rates and random nonlinearities. Interestingly\, the introduction of such inhomogeneities leads to a richer and much more nuanced picture when compared to the homogeneous setting.
URL:http://www.trr352.de/event/branching-brownian-motion-branching-random-walks-and-the-fisher-kpp-equation-in-spatially-random-environment/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240711T121500
DTEND;TZID=Europe/Berlin:20240711T121500
DTSTAMP:20260504T064436
CREATED:20250706T223108Z
LAST-MODIFIED:20250706T223108Z
UID:10000062-1720700100-1720700100@www.trr352.de
SUMMARY:Augmenting Spectral Methods with Normalizing Flows and Application to Computing Molecular Excited States
DESCRIPTION:(Pseudo)spectral methods are popular for solving a wide variety of differential equations and generic optimization problems. Due to favourable approximation properties\, such as rapid convergence for smooth functions\, they are particularly popular and effective for solving time-independent Schrödinger equations. For example\, in the domain of molecular quantum physics\, spectral and pseudospectral methods are the building blocks for a variety of variational techniques to solve nuclear Schrödinger equations. Despite their many favourable approximation properties\, these methods suffer from the curse of dimensionality and have slow convergence rates for highly-oscillatory functions. This limits their applicability in a wide variety of fields. Moreover\, their effectiveness is highly dependent on the initial choice of the basis. \nIn this talk I propose increasing the expressivity of (pseudo)spectral methods by composing a chosen orthonormal basis with an optimizable measurable mapping. This gives rise to an induced sequence. I characterize necessary and sufficient conditions for this sequence to inherit the completeness of the underlying orthonormal basis. Here\, it is shown that the invertibility of the mapping is a necessary condition. Subsequently\, I discuss the approximation of Schwartz functions in the linear span of Hermite functions that are composed with invertible mappings. To this end\, I derive convergence guarantees and characterise the convergence order. Finally\, I show numerical simulations for computing the vibrational spectra of polyatomic molecules. In these simulations\, the invertible mapping was modelled using a normalizing flow\, i.e.\, an invertible neural network to augment the expressivity of a given basis. Comparisons against the use of standard bases demonstrate orders-of-magnitude increased accuracy when using normalizing flows.
URL:http://www.trr352.de/event/augmenting-spectral-methods-with-normalizing-flows-and-application-to-computing-molecular-excited-states/
LOCATION:Room 03.10.011\, Boltzmannstr. 3\, Garching Forschungszentrum\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240710T160000
DTEND;TZID=Europe/Berlin:20240710T160000
DTSTAMP:20260504T064436
CREATED:20250706T223627Z
LAST-MODIFIED:20250706T223627Z
UID:10000063-1720627200-1720627200@www.trr352.de
SUMMARY:Classifying loops of symmetry-protected states
DESCRIPTION:The classification of states of quantum lattice systems is a well -defined mathematical endeavour which started with the discovery of the quantum Hall effect. In this talk\, I will discuss the topology of a simple cl ass\, the so-called invertible states\, which I will\ndefine. It is by definition a connected set\, and we shall explore its further topological properties. Specifically\, I will be interested in what can be identified with its fundamental group; Physically\, this is about classifying cycles of physical processes\, or pumps. I will\npresent a classification of such loops of invertible state that have a local symmetry\, which can be proved to be complete. This is joint work with Wojciech De Roeck\, Martin Fraas and Tijl Jappens.
URL:http://www.trr352.de/event/classifying-loops-of-symmetry-protected-states/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240709T161500
DTEND;TZID=Europe/Berlin:20240709T161500
DTSTAMP:20260504T064436
CREATED:20250707T133530Z
LAST-MODIFIED:20250829T140653Z
UID:10000107-1720541700-1720541700@www.trr352.de
SUMMARY:A new bulk Z_2 invariant for interacting phases
DESCRIPTION:The stability of topological indices of condensed matter systems in the p resence of interactions is not expected to hold universally. In this colloquium\, I will first discuss the mathematical setup of the classification of interacting phases. I will then focus on a new Z_2 – valued index for time-reversal invariant interacting fermions on infinite lattices and prove its topological stability. I will show that it generalizes the well -known Fu-Kane-Mele index of topological insulators\, thereby proving its stability under large perturbations. This is joint work with Alex Bols and Mahsa Rahnama.
URL:http://www.trr352.de/event/a-new-bulk-z_2-invariant-for-interacting-phases/
LOCATION:Room 5610.EG.011 (CIT Sitzungsraum 1)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240709T140000
DTEND;TZID=Europe/Berlin:20240709T140000
DTSTAMP:20260504T064436
CREATED:20250707T132755Z
LAST-MODIFIED:20250707T132755Z
UID:10000103-1720533600-1720533600@www.trr352.de
SUMMARY:Algebraic description of infinite-volume lattice fermions
DESCRIPTION:The operator-algebraic description of quantum mechanical systems can be used to mathematically deal with systems\, where the usual Hilbert space description becomes inconvenient or breaks down. In this talk I will discuss how\, using this formalism\, one can describe a system of interacting lattice fermions directly in the infinite-volume limit. This will allow us to formulate and analyse properties of the bulk of the system\, such as the bulk Hall conductivity.
URL:http://www.trr352.de/event/algebraic-description-of-infinite-volume-lattice-fermions/
LOCATION:Room 5610.EG.011 (CIT Sitzungsraum 1)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Junior Coffee Breaks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240709T140000
DTEND;TZID=Europe/Berlin:20240709T140000
DTSTAMP:20260504T064436
CREATED:20250707T132616Z
LAST-MODIFIED:20250707T132616Z
UID:10000102-1720533600-1720533600@www.trr352.de
SUMMARY:What is the landscape function?
DESCRIPTION:For many problems in quantum mechanics it is important to have a good grasp of the operators modelling the system. The landscape function was introduced as a tool to compute spectral quantities of such operators. Numerical experiments led to many conjectures on what the landscape function should be able to capture. In this talk I will give an introduction to the topic and provide an overview of the progress made in the last decade.
URL:http://www.trr352.de/event/what-is-the-landscape-function/
LOCATION:Room 5610.EG.011 (CIT Sitzungsraum 1)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Junior Coffee Breaks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240708T150000
DTEND;TZID=Europe/Berlin:20240708T150000
DTSTAMP:20260504T064436
CREATED:20250706T223923Z
LAST-MODIFIED:20250706T223923Z
UID:10000064-1720450800-1720450800@www.trr352.de
SUMMARY:Metastability of the contact process on evolving scale-free networks
DESCRIPTION:We study the contact process on scale-free inhomogeneous random graphs evolving according to a stationary dynamics\, where the neighbourhood of each vertex is updated with a rate depending on its strength. We identify the full phase diagram of metastability\nexponents in dependence on the tail exponent of the degree distribution and the rate of updating.\nThe talk is based on joint work with Emmanuel Jacob (Lyon) and Amitai Linker (Santiago de Chile).
URL:http://www.trr352.de/event/metastability-of-the-contact-process-on-evolving-scale-free-networks/
LOCATION:Room 8101.02.110 (Seminarraum)\, Parkring 11-13\, Garching b. München\, 85748\, Germany
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240620T160000
DTEND;TZID=Europe/Berlin:20240620T160000
DTSTAMP:20260504T064436
CREATED:20250706T224204Z
LAST-MODIFIED:20250706T224204Z
UID:10000065-1718899200-1718899200@www.trr352.de
SUMMARY:On Lieb-Robinson bounds for long-range interacting bosons
DESCRIPTION:We prove a thermodynamically stable Lieb-Robinson bound (LRB) for bosons with long-range interaction on lattices. The condition is that the initial state admits (i) uniformly bounded density from above and (ii) no particle in the region separating the initial supports of the observables entering the LRB. Furthermore\, if the initial state has controlled density from both above and below\, then the validity threshold for decay rate of the hopping terms can be improved to $\alpha > d+ 2$. The proof is based on the weak LRBs and the thermodynamically stable bounds on particle transport obtained in recent joint works with Lemm\, Rubiliani\, and Sigal.
URL:http://www.trr352.de/event/on-lieb-robinson-bounds-for-long-range-interacting-bosons/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Talks
END:VEVENT
END:VCALENDAR