CPT

Calendar of Physics Talks Vienna

Laser cooling molecules
Speaker:Stefan Truppe (Fritz-Haber-Institut der Max-Planck-Gesellschaft, Department of Molecular Physics)
Abstract:The ability to cool atoms below the Doppler limit – the minimum temperature reachable by Doppler cooling – has been essential to most experiments with quantum degenerate gases, optical lattices and atomic fountains, among many other applications. Molecules can have a permanent electric dipole moment for strong and long range dipole-dipole interactions and additional degrees of freedom such as rotation and vibration. Ultracold molecules offer new and exciting applications ranging from precision measurements to test fundamental symmetries, quantum information and quantum simulation. Additionally, ultracold molecules with permanent electric dipole moments can be used to study dipolar quantum gases with interaction energies 103-104 times stronger than similar experiments with Dy or Er atoms. However, the additional degrees of freedom make it also challenging to laser cool the molecules ....
Date: Mon, 06.05.2019
Time: 15:00
Location:Lise-Meitner-HS, 1st floor Boltzmanngasse 5, 1090 Vienna
Contact:T. Juffmann

On positivity of energy in higher dimensions
Speaker:Piotr Chruściel (Univ. Wien)
Abstract:I will review the notion of total energy of asymptotically flat and asymptotically hyperbolic manifolds in general relativity, and sketch the recent proof, together with Erwann Delay, of positivity of hyperbolic energy in all dimensions.
Date: Tue, 07.05.2019
Time: 13:45
Duration: 60 min
Location:TU Wien, Wiedner Hauptstraße 8, Yellow Area, 9th floor, Seminar Room DB 09 E23
Contact:S. Fredenhagen, D. Grumiller

Nested soft-collinear subtraction for infrared singularities at NNLO
Speaker:Raoul Roentsch (CERN)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 07.05.2019
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, S. Plätzer, M. Procura

Simulation of molecular photochemistry
Speaker:Leticia González (University of Vienna)
Abstract:When molecules are irradiated by light, they are electronically excited, undergoing photophysical and photochemical processes. These processes mean that the molecule will explore different regions of the excited potential energy surfaces, which nowadays can be mapped with different theoretical methods, from the stationary and dynamical point of view. Due to the often pseudo-degeneracy of states and the involvement of potential surfaces of same or different multiplicity that can cross, breaking the Born-Oppenheimer approximation, the calculation of electronic excited states has not yet reached the maturity and accuracy which is golden standard in the electronic ground state. In this lecture, the current efforts of our group on understanding the behaviour of molecules under light irradiation will be reported.
Date: Wed, 08.05.2019
Time: 14:15
Location:Seminar room FH gelb 10, Institute for Theoretical Physics – Vienna University of Technology, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower)
Contact:Joachim Burgdörfer

Asymptotics properties of the small data solutions of the Vlasov-Maxwell system
Speaker:Leo Bigorgne (Orsay)
Abstract:The Vlasov-Maxwell system is a classical model in plasma physics. Glassey and Strauss proved global existence for the small data solutions of this system under a compact support assumption on the initial data. I will present how vector field methods can be applied to revisit this problem. In particular, it allows to remove all compact support assumptions on the initial data and obtain sharp asymptotics on the solutions. We will also discuss the null structure of the system which constitutes a crucial element of the proof.
Date: Thu, 09.05.2019
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel, D. Fajman

nEoS: Neutron Star Equation of State from hadron physics alone
Speaker: Felipe J. Llanes-Estrada (Universidad Complutense Madrid)
Abstract:We contribute a publicly available set of tables and code to provide Equations of State (EoS) for matter at neutron star densities. Our EoSes are constrained only by input from hadron physics and fundamental principles, without feedback from neutron star observations, and so without relying on General Relativity. They can therefore be used to test General Relativity itself, as well as modified gravity theories, with neutron star observables, without logical circularity. We have adapted state of the art results from NN chiral potentials for the low--density limit, pQCD results for the asymptotically high-density EoS, and use monotonicity and causality as the only restrictions for intermediate densities, for the EoS sets to remain as model-independent as is feasible today.
Date: Thu, 09.05.2019
Time: 16:00
Duration: 60 min
Location:Institute for Theoretical Physics, TU Wien, Seminar room 10th floor (yellow area), Wiedner Haupstr. 8-10, 1040
Contact:Anton Rebhan