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X-WR-CALDESC:Events for SFB TRR 352
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250603T163000
DTEND;TZID=Europe/Berlin:20250603T163000
DTSTAMP:20260504T035842
CREATED:20250701T143532Z
LAST-MODIFIED:20250904T103339Z
UID:10000035-1748968200-1748968200@www.trr352.de
SUMMARY:Stabilization by quantum fluctuations in ultracold gases of magnetic atoms: experimental observations and theory descriptions
DESCRIPTION:Thanks to their high degree of control and tunability\, ultracold atomic gases provide a rich platform for the study of quantum many-body effects. Ultracold gases of highly magnetic atoms exhibit unique interaction properties that lead to striking behaviors\, both at the mean-field level and beyond [1]. A decade ago\, a universal stabilization mechanism driven by quantum fluctuations was discovered in these gases. This mechanism prevents the systems from collapsing when the mean-field interactions become attractive\, and instead allows exotic states of matter to arise\, including ultradilute quantum droplets\, crystallized quantum states\, and especially the so-called supersolids [2]. In my colloquium\, I will present the seminal observations of these states and how they emerged from the long-standing progress in the field. I will discuss the theoretical description of these systems via an effective mean-field theory\, including the effect of quantum fluctuations via a higher-order effective interaction. I will outline our current understanding of the properties of these states and highlight open questions. \n[1] L. Chomaz & al\, Dipolar physics: a review of experiments with magnetic quantum gases\, Reports on Progress in Physics 86\, 026401 (2023).\n[2] L. Chomaz\, Quantum-stabilized states in magnetic dipolar quantum gases\, arXiv preprint 2504.06221 (2025)
URL:https://www.trr352.de/event/stabilization-by-quantum-fluctuations-in-ultracold-gases-of-magnetic-atoms-experimental-observations-and-theory-descriptions/
LOCATION:Room A 027\, Theresienstr. 37\, Munich\, 80333\, Germany
CATEGORIES:Talks
ORGANIZER;CN="Prof. Dr. Lauriane Chomaz":MAILTO:chomaz@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250604T160000
DTEND;TZID=Europe/Berlin:20250604T160000
DTSTAMP:20260504T035842
CREATED:20250701T142959Z
LAST-MODIFIED:20250701T143753Z
UID:10000034-1749052800-1749052800@www.trr352.de
SUMMARY:DFG Funding Opportunities and Key Evaluation Criteria in DFG Proposals
DESCRIPTION:
URL:https://www.trr352.de/event/dfg-funding-opportunities-and-key-evaluation-criteria-in-dfg-proposals/
LOCATION:Room B 349\, Theresienstr. 39\, Munich\, 80333\, Germany
CATEGORIES:Talks
ORGANIZER;CN="Brit Red%C3%B6hl":MAILTO:Brit.Redoehl@dfg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250605T121500
DTEND;TZID=Europe/Berlin:20250605T121500
DTSTAMP:20260504T035842
CREATED:20250327T191902Z
LAST-MODIFIED:20260219T213308Z
UID:10000003-1749125700-1749125700@www.trr352.de
SUMMARY:Regularized Dynamical Parametric Approximation for Stiff Evolution Problems
DESCRIPTION:Evolutionary deep neural networks have emerged as a rapidly growing field of research. This talk discusses numerical integrators for such and other classes of nonlinear parametrizations u(t) = Φ(θ(t)) where the evolving parameters θ(t) are to be computed. The primary focus is on tackling the challenges posed by the combination of stiff evolution problems and irregular parametrizations\, which typically arise with neural networks\, tensor networks\, flocks of evolving Gaussians\, and in further cases of overparametrization. Regularized parametric versions of the implicit Euler method and higher-order implicit Runge–Kutta methods for the time integration of the parameters in nonlinear approximations to evolutionary partial differential equations are presented. At each time step\, an ill-conditioned nonlinear optimization problem is solved approximately with a few regularized Gauß–Newton iterations. Error bounds for the resulting parametric integrator are derived by relating the computationally accessible Gauß–Newton iteration for the parameters to the computationally inaccessible Newton iteration for the underlying non-parametric time integration scheme. Numerical experiments that are designed to show key properties of the proposed parametric integrators are discussed.
URL:https://www.trr352.de/event/regularized-dynamical-parametric-approximation-for-stiff-evolution-problems/
LOCATION:Room 03.10.011\, Boltzmannstr. 3\, Garching Forschungszentrum\, 85748\, Germany
CATEGORIES:Talks
ORGANIZER;CN="Dr. J%C3%B6rg Nick":MAILTO:joerg.nick@math.ethz.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250613T140000
DTEND;TZID=Europe/Berlin:20250613T140000
DTSTAMP:20260504T035842
CREATED:20250701T142444Z
LAST-MODIFIED:20250701T142700Z
UID:10000033-1749823200-1749823200@www.trr352.de
SUMMARY:Quantum Tomography from the Evolution of a Single Expectation
DESCRIPTION:Conventional quantum tomography assumes a high degree of control over the system in question in order to measure many observables. On the other hand\, a classical dynamical system may be reconstructed from a time series of a single observable by means of delay embeddings. Inspired by this\, we investigate the possibility of tomography of a quantum system undergoing a known homogenous time evolution when we have control over only the time of measurement. Remarkably\, full quantum state tomography is possible for every non-trivial binary measurement evolved by any quantum channel\, bar a null set. This remains true when restricted to Lindblad semigroups\, although unitary evolution–even with added simply depolarizing noise–is insufficient beyond the qubit case\, highlighting the need for non-trivial noise. We explore various further aspects of the problem\, including prior information\, expectation bounds for finite statistics\, and recovery of an infinite time series of expectation values from a finite one given only spectral properties of the evolution.
URL:https://www.trr352.de/event/quantum-tomography-from-the-evolution-of-a-single-expectation/
LOCATION:Room 5612.02.020 (Besprechungsraum)\, Boltzmannstr. 3\, Garching b. München\, 85748\, Germany
CATEGORIES:Talks
ORGANIZER;CN="Corlie Rall":MAILTO:hjalmar.rall@tum.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250613T160000
DTEND;TZID=Europe/Berlin:20250613T160000
DTSTAMP:20260504T035842
CREATED:20250706T224419Z
LAST-MODIFIED:20250829T134820Z
UID:10000066-1749830400-1749830400@www.trr352.de
SUMMARY:Magic moire materials with a twist
DESCRIPTION:I will review the mathematical analysis behind two classes of new exciting materials: Twisted bilayer graphene (TBG) and twisted semiconductors (TMDs) with an emphasis on their mathematical properties and differences. If time permits I will discuss results on these models under disorder. Joint work with Maciej Zworski\, Izak Oltman\, Martin Vogel\, and Mengxuan Yang.
URL:https://www.trr352.de/event/magic-moire-materials-with-a-twist/
LOCATION:Room C3N14\, Auf der Morgenstelle 10\, Tübingen\, 72076\, Germany
CATEGORIES:Talks
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