Theorie:Seminare+Veranstaltungen in diesem Semester

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	April 2023

Thu	13/04/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Alessio Zaccone University of Milan Finding solutions for random sphere packings, from structure to elasticity Abstract I will briefly review the problem of random close packing (or maximally random jammed packings) of spheres, starting from the statistical physics of hard sphere systems, for which analytical results were developed in the 20th century and early 21st century by, among others, Percus, Lebowitz, Stillinger and Torquato, Edwards, Parisi and others. I will then show how an analytical closed-form solution for the random close packing volume fractions in d=2 and d=3 can be built from the Percus-Yevick solution to the many-body hard sphere hierarchy in the liquid state [1]. A robust justification to the assumptions used (i.e. 1-the use of liquid state theory at jamming, and, 2-the use of the ordered close packing FCC condition as an effective boundary condition) has been provided in [2] based on new numerical calculations with the Jiao-Torquato algorithm. I will then show how the analytical solution can be extended to make predictions of RCP volume fractions for polydisperse and bidisperse hard sphere systems [2] as a function of the size polydispersity (for binary mixtures, mixture composition and the size asymmetry), in good agreement with numerical simulations with no adjustable parameters. In the final part of the talk, I will present closed-form results for the elasticity of random sphere packings [3] and recent developments for the plasticity of amorphous solids, where unexpected topological defects have been recently discovered [4]. [1] A. Zaccone, Phys. Rev. Lett. 128, 028002 (2022) [2] C. Anzivino et al., J. Chem. Phys. 158, 044901 (2023) [3] A. Zaccone & E. Scossa-Romano, Phys. Rev. B 83, 184205 (2011) [4] M. Baggioli et al., Phys. Rev. Lett. 127, 015501 (2021) If anyone is unable to join the seminar in person, email me and we will stream it on https://uni-goettingen.zoom.us/j/96249516311?pwd=Q2tURDFpcUVQaEQ3cXJSVk9wNkFPQT09 Kontakt: Peter Sollich

Thu	20/04/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Grzegorz Szamel Colorado State University Sound damping in glasses Kontakt: Peter Sollich

Thu	27/04/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Gabriel Knotz ITP Entropy bound for time reversal markers Kontakt: Peter Sollich


	May 2023

Thu	04/05/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Cai Dieball MPI Asymmetric thermal relaxation in experiments and driven systems Kontakt: Peter Sollich

Mon	08/05/23 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Karsten Stasieniuk Göttingen Spin 3/2 Dark Matter Kontakt: K.-H. Rehren

Fri	12/05/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Joerg Rottler The non-equilibrium physics of driven amorphous materials Kontakt: Peter Sollich

Mon	15/05/23 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Laila Henkes Göttingen The Casimir Effect Kontakt: K.-H. Rehren

Thu	25/05/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Mario Tagliazucchi University of Buenos Aires Modeling the phase behavior of nanoparticle superlattices with a molecular theory Kontakt: Peter Sollich


	June 2023

Thu	01/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Juliana Caspers ITP Nonlinear Langevin equation for a driven probe Kontakt: Peter Sollich

Mon	05/06/23 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Kia-Jüng Yang Göttingen IR singularities in QED Kontakt: K.-H. Rehren

Thu	08/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Moshir Harsh ITP Effective field corrections to the dynamics of chemical reaction networks with large fluctuations Kontakt: Peter Sollich

Tue	13/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
11:15	Seminar Statistical Physics Pablo de Castro ICTP-SAIFR & Institute for Theoretical Physics, São Paulo State University Collective Dynamics of Moving Organisms: The Statistical Physics of Self-Propelled Particles Kontakt: Peter Sollich

Mon	19/06/23 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Max Eckert Göttingen CANCELLED Kontakt: K.-H. Rehren

Tue	20/06/23 Seminarraum 3, A.03.101 Theoretische Physik
14:15	CMT Kaden Hazzard Rice University tba Kontakt: Prof. Dr. Heidrich-Meisner

Thu	22/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Suropriya Saha MPI f. Dynamics and Self-Organization tbc Kontakt: Peter Sollich

Thu	29/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Jianzhong Wu UC Riverside tba Kontakt: Peter Sollich

Fri	30/06/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Patrick Royall ESPCI Paris tbc Kontakt: Peter Sollich


	July 2023

Mon	03/07/23 SR9 Theoretische Physik
14:15	CMT David Luitz Universität Bonn tba Kontakt: Prof. Dr. Fabian Heidrich-Meisner

Mon	03/07/23 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Taisanul Haque Göttingen Conformal QFT in two dimensions Kontakt: K.-H. Rehren

Tue	04/07/23 Seminarraum 3, A.03.101 Theoretische Physik
14:15	Theoretisch-physikalisches Seminar - Dienstag Ayushi Singhania IFW Dresden tba Kontakt: Theoretische Physik/Prof. Heidrich-Meisner

Tue	04/07/23 Seminarraum 7, C.01.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Max Eckert Göttingen Tunneling and Vacuum Stability Kontakt: K.-H. Rehren

Thu	06/07/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Heiko Menzler University of Göttingen Delocalization in disordered quantum spin chains coupled to classical phonons Kontakt: Peter Sollich

Thu	13/07/23 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Alessio Zaccone University of Milan, Italy Topological defects as mediators of plasticity in glasses Kontakt: Peter Sollich


	August 2023

Wed	30/08/23 Theoretische Physik
17:30	Sonderveranstaltung Dr. Valerie Domcke CERN Schnappschüsse aus dem frühen Universum (Alte Mensa, Wilhelmsplatz) Kontakt: L. Covi


	September 2023

Mon	11/09/23 Seminarraum 9, C.04.101 Theoretische Physik
14:15	Aktuelle Probleme der theoretischen Festkörperphysik (Forschungsseminar M.Phy.411) Kontakt: St. Kehrein, F. Heidrich-Meisner

Mon	18/09/23 SR4, A04.101 Theoretische Physik
14:15	Sonderveranstaltung Kostas Daoulas MPI f. Polymer Res., Mainz Generic mesoscopic simulations of helical polymers: investigating the breaking of topological mirror symmetry and cooperative phenomena Abstract Helical molecules can assemble into large structures with a left- or a right-handed twist. Such chiral assemblies have special optical properties and produce colors, for example, in some insects. The mechanisms through which the molecular helicity creates handedness in large supramolecular assemblies are not yet fully understood. To explore them, it is useful to start from a simpler problem and investigate how helicity affects the global structure of single molecules. We use computer simulations to investigate [1] how the helicity of isolated homochiral polymers breaks topological mirror symmetry. Polymers are described by worm-like chains (WLC), where chiral coupling between segments promotes homochiral helical conformations. The sign and magnitude of the coupling coefﬁcient u determine the sense and strength of helicity. The corrugation of the helical molecular surface is controlled by adjusting the excluded volume via the radius R of a hard sphere placed at each WLC segment. We perform Monte Carlo sampling of polymer conformations for values of u spanning a range from achiral polymers to polymers with well-developed helices. First, we demonstrate that the coil-helix transition in our model is not a phase transition but a crossover. Second, we analyze knotted polymer conformations and demonstrate that the sense of polymer helicity, left- or right-handed, influences the handedness of molecular knots and identify a generic mechanism that underlies this effect ─ the chiral braiding. Next, we extend our model to “dynamically helical” polymers, i.e. polymers where the energy barrier for local reversals between left and right helical senses is low. [2] We demonstrate how this model can be used to study cooperative induction of chirality [3], e.g. effects of chiral biasing groups, majority rules, and sergeants-and-soldiers effects. We conclude by discussing the perspectives of our model in investigating the effects of such cooperative phenomena in helical polymers on knotting properties. References [1] Y. Zhao, J. Rothörl, P. Besenius, P. Virnau, K. Daoulas, ACS Macro Lett. 2023, 12, 234. [2] S. M. Morrow, A. J. Bissette, S. P. Fletcher, Nat. Nanotechnol. 2017, 12, 410. [3] M. M. Green, J.-W. Park, T. Sato, A. Teramoto, S. Lifson, R. L. B. Selinger, J. V. Selinger, Angew. Chem. Int. Ed 1999, 38, 3138. Kontakt: M. Müller

Tue	19/09/23 SR4, A04.101 Theoretische Physik
09:30	Sonderveranstaltung Alireza Soleimani ITP Disputation: Multiscale simulations of liquid-liquid interfaces: From lipid membrane to graphene Kontakt: Risselada

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