
Vienna Theory Lunch Seminarby Florian Ecker (TU), Christopher Lieberum (UV), Florian Lindenbauer (TU) and Maximilian Ofner (UV) Tuesdays 12:3013:45held alternately
at:
We thank our kind sponsors:

Idee: 
Nach pandemiebedingter Pause wollen wir das Vienna theory lunch
seminar wiedererwecken, das aktuelle Themen der Theoretischen
Physik, die von DiplomandInnen, DoktorandInnen und PostDocs
behandelt werden, aufgreift. 
After a break due to the pandemic we want to revive the Vienna
theory lunch seminar. The focus is on recent theoretical research
done by Master students, PhDs and PostDocs. 
Wie kann ich teilnehmen? 
Einfach erscheinen! Um per Email informiert zu werden, bitte in die Mailingliste eintragen. 
Just attend! To receive informations via email register for the Mailinglist. 
Mar 5 2024 UV 
Tim Lüders 
The functorial axiomatization of topological quantum field theory In this talk, I will give a lightning introduction to topological quantum field theory in its functorial axiomatization, due to Atiyah and Segal. We start by exploring the very basics of the mathematical discipline of category theory, which will then be used as a convenient tool to package essential properties of Feynman’s path integral into a mathematically rigorous framework. Examples of physical theories that can be described in this setting include ChernSimons theory as well as topological sigma and state sum models. I will finish the talk by mentioning several natural generalizations of the introduced mathematical structures, and what physical interest each of them carries. 
Mar 12 2024 
Rektorstag Uni Wien 


Mar 19 2024 
Mario Hudelist 
Spacetime curvatureinduced corrections to Rytov's law in optical fibers According to Rytov's law, the polarization vector of light follows a FermiWalker transport equation in optical fibers. Recent advancements in theory propose a modification to Rytov's law due to fiber bending. The aim of this talk is to further extend these predictions from flat to curved spacetime. This involves perturbatively solving Maxwell's equations under the assumption that the wavelength is significantly shorter than the fiber radius, as well as the characteristic lengthscales of the ambient spacetime. This results in a coupling of the polarization vector to the Riemann curvature tensor. 
Mar 26 2024 
Easter break 
 
Apr 02 2024 
Easter break 
 
Apr 09 2024 UV 
Andreas Schmitt 
Superconducting baryon crystal at strong magnetic field Strongly interacting matter in extreme magnetic fields occurs in heavyion collisions and neutron stars and is of theoretical interest for the phase structure of Quantum Chromodynamics. It was previously found that a socalled Chiral Soliton Lattice is formed at sufficiently large magnetic fields and baryon chemical potentials. Using chiral perturbation theory and methods from ordinary typeII superconductivity I will discuss the instability of the Chiral Soliton Lattice and the resulting transition to a 3D crystalline structure. This structure is an inhomogeneous condensate of neutral and charged pions and thus a superconductor with spatially modulated magnetic field and, due to the axial anomaly, spatially modulated baryon number. I will also speculate what this new phase implies for the QCD phase structure. 
Apr 16 2024 TU 
Paul Hotzy 
Towards the computation of realtime observables in YangMills theories on the lattice Lattice Quantum Chromodynamics (LQCD) is one of the most successful methods for making nonperturbative predictions in highenergy physics. Despite its achievements, traditional computational techniques encounter limitations — arising from the notorious sign problem — when dealing with dynamic observables in physical time or at nonvanishing chemical potential. Our recent work focuses on the complex Langevin (CL) method, which aims to circumvent these challenges by generalizing the Stochastic Quantization approach. We have significantly improved and successfully applied CL to realtime SU(N) gauge theories on a 1+3 dimensional lattice for the first time. In this talk, I present our recent advances in calculating unequaltime correlation functions directly from first principles. These developments may lay the cornerstone for future applications of CL, enabling the computation of spectral functions and transport coefficients. These quantities are of high phenomenological interest in strongly interacting systems such as the Quark Gluon Plasma (QGP). 
Apr 23 2024 UV 
Argam Ohanyan 
TBA

Apr 30 2024 TU 
David Globosits 
A Photonic Floquet Scattering Matrix for WavefrontShaping in TimePeriodic Media The physics of waves in timevarying media provides numerous opportunities for wave control that are unattainable with static media. In particular, Floquet systems with a periodic time modulation are currently of considerable interest. In my talk, I will demonstrate how the scattering properties of a finite Floquet medium can be correctly described by a static Floquet scattering matrix, which satisfies a pseudounitary relation. Using this Floquet scattering matrix, I will further show how one can identify light pulses that are optimally shaped both in their spatial and temporal degrees of freedom for the optical micromanipulation of timevarying media. 
May 07 2024 UV 
TBA 
TBA

May 14 2023 TU 
TBA 
TBA

May 21 2024  
Pentecost 


May 28 2024 UV 
TBA 
TBA

Jun 04 2024 TU 
TBA 
TBA

Jun 11 2024 UV 
TBA 
TBA

Jun 18 2024 TU 
TBA 
TBA

Jun 25 2024 UV 
Sukrut Mondkar 
Learning holographic horizons We apply machine learning to understand fundamental aspects of holo graphic duality, specifically the entropies obtained from the apparent and event horizon areas. We show that simple features of only the time series of the pressure anisotropy can predict the areas of the apparent and event horizons in the dual bulk geometry at all times. Given that simple Vaidyatype metrics constructed just from the apparent and event horizon areas can be used to approximately obtain unequal time correlation functions, we argue that the corresponding entropy functions are the measures of information that need to be extracted from simple onepoint functions to reconstruct specific aspects of correlation functions of the dual state with the best possible approximations. 
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