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DTSTART;TZID=Europe/Berlin:20251212T143000
DTEND;TZID=Europe/Berlin:20251212T180000
DTSTAMP:20260503T183829
CREATED:20251202T201643Z
LAST-MODIFIED:20251202T201643Z
UID:10000123-1765549800-1765562400@www.trr352.de
SUMMARY:Probability Colloquium Augsburg-Munich
DESCRIPTION:Schedule:\n\n14:30    Welcome\n15:00    Talk by   Nicos Georgiou (Sussex)\n16:00    Coffee break\n16:30    Talk by  Christian Kühn (TU Munich)\n18:00    Option for common dinner\n\n  \n\nTitles and abstracts:\nNicos Georgiou: Mean-field limit and parameter estimation for contagion dynamics on higher-order structures \nClassical models of contagion epidemics have graph based representations where the nodes represent the population and infections occur from an infected individual to a susceptible individual via a network link between them. At the same time\, healing mechanisms try to fight the epidemic at node level. The simple descriptions of these representations also underscore their limitations\, since the propagation of contagions in complex systems often involves repeated or simultaneous stimuli that individuals receive from their social contacts (such as their work or household). One may mechanistically encode these non-linear effects into contagion models by considering interactions that go beyond simple pairwise connections\, by using hypergraphs rather than graphs. In this talk we will see the role higher-order interactions can play in the behaviour of the model when a rigorous mean-field can be obtained. Furthermore\, we will discuss some inference techniques for the parameters of the epidemic (rates of infection) when only partial information on the type of infection is available and with only a single realisation of the epidemic curve as a datum. \n  \nChristian Kühn: Epidemic Dynamics: From Simple Models to Complex Systems \nIn this talk\, I am going to give an overview of various techniques to analyze contact processes and their nonlinear dynamics with a focus on moment-based methods. The main results will be (a) the existence of periodic motion in systems with waning immunity\, (b) warning signs for outbreaks in adaptive epidemic models with social distancing and quarantining\, (c) the influence of transport in multiplex networks\, and (d) the influence of multiscale group interactions to prevent epidemics. We shall also see how to locally justify moment closure expansions of the dynamics.
URL:https://www.trr352.de/event/probability-colloquium-augsburg-munich-2/
LOCATION:University of Augsburg\, Room 2004 (L1)\, Universitätsstraße 14\, Augsburg\, 86159
CATEGORIES:Colloquia
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250715T163000
DTEND;TZID=Europe/Berlin:20250715T163000
DTSTAMP:20260503T183829
CREATED:20250707T132940Z
LAST-MODIFIED:20250904T091423Z
UID:10000104-1752597000-1752597000@www.trr352.de
SUMMARY:Optimal criteria for magnetic fields that bind electrons
DESCRIPTION:This talk will provide a basic introduction to the three dimensional Dirac equation that describes an electron interacting with a magnetic field. Over the years a lot of work has gone into constructing zero energy solutions\, also known as zero modes\, for said equation.\nIn this talk I will explain the importance of zero modes e.g. I will show how they relate to the stability of the hydrogen atom. After presenting explicit examples\, I will state necessary conditions for the magnetic field so that zero modes exist. Here\, of particular interest is a sharp inequality that is optimized by a magnetic field whose field lines are interlinking circles. This inequality relates to sharp inequalities for spinors of which some more examples will be given.
URL:https://www.trr352.de/event/optimal-criteria-for-magnetic-fields-that-bind-electrons/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250213T161500
DTEND;TZID=Europe/Berlin:20250213T161500
DTSTAMP:20260503T183829
CREATED:20250707T133135Z
LAST-MODIFIED:20250829T140603Z
UID:10000105-1739463300-1739463300@www.trr352.de
SUMMARY:The Mathematics of Locality in Many-Body Quantum Systems
DESCRIPTION:In relativity\, nothing can travel faster than the speed of light. But there are often emergent speed limits\, such as the speed of sound\, that limit practical information transfer. In quantum many-body lattice models\, the existence of this emergent speed limit was first proved by Lieb and Robinson in 1972. Over 50 years later\, their result has formed the backbone of very important results in mathematical physics. I will present a modern perspective on the Lieb-Robinson Theorem and present a selection of its applications\, such as: constraining the time to prepare entangled states\, the simulatability of quantum physics on classical computers\, and the decay of the false vacuum in metastable quantum states.
URL:https://www.trr352.de/event/the-mathematics-of-locality-in-many-body-quantum-systems/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241119T161500
DTEND;TZID=Europe/Berlin:20241119T161500
DTSTAMP:20260503T183829
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:https://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
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DTSTART;TZID=Europe/Berlin:20240709T161500
DTEND;TZID=Europe/Berlin:20240709T161500
DTSTAMP:20260503T183829
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:https://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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230510T170000
DTEND;TZID=Europe/Berlin:20230510T170000
DTSTAMP:20260503T183829
CREATED:20250707T133855Z
LAST-MODIFIED:20250829T140726Z
UID:10000108-1683738000-1683738000@www.trr352.de
SUMMARY:Some avatars of the correspondence principle in semi-classical analysis
DESCRIPTION:The correspondence principle\, as stated by Niels Bohr in 1923\, is at the root of the traditional results in semi-classical analysis. It offers a natural insight into the world of semi- classical pseudodifferential operators\, Egorov Theorem\, coherent states\, Wigner measures\, etc… The aim of this talk will be to present this general setting and explain how recent re- sults of semi-classical analysis express in that frame.
URL:https://www.trr352.de/event/some-avatars-of-the-correspondence-principle-in-semi-classical-analysis/
LOCATION:Room 5301.EG.001 (Auditorium)\, Lichtenbergstr. 2a\, Garching b. München\, 85748\, Germany
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230504T163000
DTEND;TZID=Europe/Berlin:20230504T163000
DTSTAMP:20260503T183829
CREATED:20250707T134018Z
LAST-MODIFIED:20250829T140755Z
UID:10000109-1683217800-1683217800@www.trr352.de
SUMMARY:Chemists and physicists have found how to approximate Schrödinger's equation;here is how mathematicians can contribut
DESCRIPTION:Schrödinger’s equation is a beautiful piece of mathematics. It f its on just one line and is supposed to accurately describe the behavior of most atoms and molecules of our world. But it is essentially impossible to simulate accurately\, due to its very high dimensionality. In this talk I will explain how physicists and chemists have overcome this problem in an impressive way\, within a framework called “Density Functional Theory”. I will discuss the role that mathematical results have historically played in this revolution and then present more recent results.
URL:https://www.trr352.de/event/chemists-and-physicists-have-found-how-to-approximate-schrodingers-equationhere-is-how-mathematicians-can-contribut/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Colloquia
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