CPT

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Calendar of Physics Talks Vienna

Integrable field theories in two and higher dimensions
Speaker:Alexander Schenkel (University of Trento)
Abstract:In this talk, I will explain how the relationship between 2d integrable field theories and 4d semi-holomorphic Chern-Simons theories discovered by Costello and Yamazaki admits a rigorous and conceptually clean description in terms of the homotopy theory of L∞ - algebras. In particular, through a combination of techniques from complex geometry and homotopy transfer, I will show how to extract from a semi- holomorphic Chern-Simons theory its associated integrable field theory and provide a novel perspective on Lax connections in terms of ∞- morphisms. I will conclude by illustrating how this framework scales to arbitrary dimensions and thereby provides some structural insights into the elusive topic of higher-dimensional integrability.This talk is based on joint work with M. Benini and B. Vicedo [arXiv:2601.19993] and with M. Benini, R. Cullinan and B. Vicedo [arXiv:2604.24864].
Date: Tue, 30.06.2026
Time: 14:00
Duration: 60 min
Location:Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock
Contact:S. Fredenhagen, M. Sperling

CPT and Lorentz Symmetry Tests by Rabi Spectroscopy on Hydrogen, Deuterium and possibly Antihydrogen
Speaker:Martin C. Simon (Marietta Blau Institute, Österreichische Akademie der Wissenschaften (ÖAW), Wien)
Abstract:Lorentz symmetry and the closely related combination of the three discrete symmetries Charge conjugation, Parity, and Time reversal (CPT) are cornerstones of our most fundamental theories. Any violation would indicate new physics and could shed light on outstanding puzzles such as the matter–antimatter asymmetry. Antihydrogen is a particularly favourable system for such searches. Comparison of its ground-state hyperfine splitting to the extremely well-known value of 1 420 405 751.768(1) Hz in ordinary hydrogen could provide the most stringent tests. Therefore, the ASACUSA collaboration at CERN aims to measure this quantity in a beam. The commissioning of the antihydrogen hyperfine spectrometer with hydrogen demonstrated high precision [1], motivating symmetry tests relying only on matter. These experiments were performed on hydrogen at CERN [2] and on deuterium at the Laboratoire Aime Co
Date: Tue, 30.06.2026
Time: 16:00
Location:TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B
Contact:Prof. Dr. Richard Wilhelm

Theory for precision measurements: from super resolution to new-physics searches
Speaker:Alexander Boeschoten (Laboratoire Kastler Brossel, Sorbonne Université)
Abstract:Achieving ever higher precision and accuracy in measurements is essential in many fields of physics. It leads to both technological innovation — for example in quantum-enhanced sensing — as well as to a better fundamental understanding of nature by testing the Standard Model of particle physics. Realizing and interpreting such precision experiments requires a close interplay between experiment and theory. In this talk, I will discuss how theory is essential in the design, performance, and interpretation of precision experiments. First, I will explain how quantum theory can be used to find the ultimate precision limits achievable in a measurement. In particular, I will present a general framework to calculate the Quantum Fisher information matrix for any parameter which is encoded in the modal part of light [1]. This matrix provides clear criteria for optimal joint estimations, and can b
Date: Wed, 01.07.2026
Time: 15:00
Duration: 45 min
Location:ZE 01 -1, new Building, ATI , TU Wien
Contact:Tim Langen