Vienna Theory Lunch Seminar

by Florian Ecker (TU), Christopher Lieberum (UV), Florian Lindenbauer (TU) and Maximilian Ofner (UV)

Tuesdays 12:30-13:45

held alternately at:

TU Wien (TU): Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11

University of Vienna (UV): Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall



We thank our kind sponsors:


Faculty of Physics, TU


Faculty of Physics, UV





Idee:

Idea:

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.

Das Niveau soll so gewählt werden, dass jeder Student und jede Studentin am Beginn des Masterstudiums dem Vortrag folgen kann. BachelorstudentInnen können besonders von dem Seminar profitieren, da es ihnen ermöglicht einen Eindruck in die Forschungsarbeit beider Universitäten zu erhalten. Die Vortragenden werden dabei auch ermutigt darüber zu sprechen, warum sie ein gewisses Forschungsgebiet gewählt haben. Dabei dürfen durchaus offene Fragen und Probleme behandelt werden und es ist nicht notwendig einen Vortrag über eine "perfekte", abgeschlossene Arbeit zu halten.

Damit es zu keinem "Zeitverlust" kommt, wird Mittagessen (Pizza) gratis zur Verfügung gestellt.

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.

The seminar is designed for graduate students but should also be comprehensible to advanced undergraduate students. Undergraduate students are particularly encouraged to attend so that they receive an overview of research activities conducted at both universities. Speakers are also encouraged to focus on their motivation for choosing their particular topic and to present open questions.

In order to avoid any "loss of time" we provide a free lunch (pizza).

Wie kann ich teilnehmen?

How can I join?

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
(Uni Wien)

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 Chern-Simons 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

UV

Mario Hudelist
(Uni Wien)

Space-time curvature-induced corrections to Rytov's law in optical fibers

According to Rytov's law, the polarization vector of light follows a Fermi-Walker 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 space-time. 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 length-scales of the ambient space-time. 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
(University of Southhampton)

Superconducting baryon crystal at strong magnetic field

Strongly interacting matter in extreme magnetic fields occurs in heavy-ion collisions and neutron stars and is of theoretical interest for the phase structure of Quantum Chromodynamics. It was previously found that a so-called Chiral Soliton Lattice is formed at sufficiently large magnetic fields and baryon chemical potentials. Using chiral perturbation theory and methods from ordinary type-II 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
(TU Wien)

Towards the computation of real-time observables in Yang-Mills theories on the lattice

Lattice Quantum Chromodynamics (LQCD) is one of the most successful methods for making non-perturbative predictions in high-energy 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 non-vanishing 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 real-time SU(N) gauge theories on a 1+3 dimensional lattice for the first time. In this talk, I present our recent advances in calculating unequal-time 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
(Uni Wien)

TBA

Apr 30 2024

TU

David Globosits
(TU Wien)

A Photonic Floquet Scattering Matrix for Wavefront-Shaping in Time-Periodic Media

The physics of waves in time-varying 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 pseudo-unitary 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 time-varying 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
(Harishchandra Research Institute)

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 Vaidya-type 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 one-point functions to reconstruct specific aspects of correlation functions of the dual state with the best possible approximations.



Google Calender for the Seminar

The calender can be added to your personal Google Calender, such that it automatically includes new events/changes and so on. For that, you need to import the following link as a new calender.
For a tutorial on how to include it, see Google help

Program Winter Semester 2023
Program Summer Semester 2020
Program Winter Semester 2019
Program Summer Semester 2019
Program Winter Semester 2018
Program Summer Semester 2018
Program Winter Semester 2017
Program Summer Semester 2017
Program Winter Semester 2016
Program Summer Semester 2016
Program Winter Semester 2015
Program Summer Semester 2015
Program Winter Semester 2014
Program Summer Semester 2014
Program Winter Semester 2013
Program Summer Semester 2013
Program Winter Semester 2012
Program Summer Semester 2012
Program Winter Semester 2011
Program Summer Semester 2011
Program Winter Semester 2010
Program Summer Semester 2010
Program Winter Semester 2009
Program Summer Semester 2009
Program Winter Semester 2008



Current programme of the Vienna Theory Lunch Club