Physik-Combo

5 Oct 2022, 10:00 → 7 Oct 2022, 16:30 Europe/Berlin

E1 05 (Leibniz-Saal) (MPI MiS Leipzig)

The Physik-Combo - a transregional training initiative of the RTG 2522 Jena Leipzig - provides in-depth research training in topical areas in the context of "Strong Dynamics and Criticality in Quantum and Gravitational Systems".

Its program consists of mini lecture series or topical reviews delivered by invited experts in the field and project talks contributed by the RTG fellows and guests.

Friends and guests from neighboring universities are welcome to participate.

The event is currently planned without possibility of online participation.

The Physik-Combo continues the tradition of the Mitteldeutsche Physik-Combo. 

Wednesday, 5 October

11:00 → 11:05 Welcome

11:05 → 12:05 Mathematical General Relativity 1

Speaker: Dejan Gajic

12:05 → 12:20 Q&A

12:20 → 14:00 Lunch break

14:00 → 15:00 Quantum fields out-of-equilibrium and information theory 1

Speaker: Stefan Flörchinger

FloerchingerComboLeipzig.pdf

15:00 → 15:15 Q&A

15:15 → 16:00 Coffee break

16:00 → 16:30 Fluidlike behavior in small atomic systems

Speaker: Lars Heyen

Heyen.pdf

16:30 → 17:00 Fermi-sea excitations in chiral one-dimensional quantum channels

Speaker: Felix Puster

Puster.pdf

Thursday, 6 October

09:00 → 10:00 Mathematical General Relativity 2

Speaker: Dejan Gajic

10:00 → 10:15 Q&A

10:15 → 10:45 Coffee break

10:45 → 11:15 Multi-messenger Bayesian analysis of binary neutron start mergers

The joint detection of the GW170817 and its electromagnetic counterparts is a milestone in multi-messenger astronomy and it can provide constraints on the neutron star equation of state.
The LIGO-Virgo data of GW170817 are analyzed using different template models focusing on the implications for neutron star matter properties.
We study AT2017gfo using semi-analytical model showing that observational data favor multi-component anisotropic geometries to spherically symmetric profiles.
By joining the GW170817 and AT2017gfo information with the NICER measurements, we constrain the radius of a neutron star of 1.4 M⊙ to 12.4±0.7 km (90% confidence level).
Finally, we explore future extreme-matter constraints delivered by postmerger gravitational-waves from binary neutron star remnants with next-generation detectors.
Postmerger remnants can probe the high-density regimes of the nuclear equation of state, allowing the inference of the maximum neutron star mass with an accuracy of 12% (90% confidence level).
Moreover, these transients can be used to infer the presence of non-nucleonic matter phases through the inference of softening of the equation of state.

Speaker: Matteo Breschi

11:15 → 11:45 GHG for Critical Phenomena simulations with bamps

We use our adapted pseudospectral code bamps, with its new hp adaptive mesh refinement, to tune close to the barrier between gravitational collapse and dispersed fields, and study the critical phenomena that emerges near that threshold. To achieve that goal and improve our previous results, we introduce adjustments to the generalised harmonic gauge formulation of General Relativity, adapting it to the specific case of near collapse simulations. In particular, we adjust the constraint violation damping scheme, taking into account the collapse of the lapse that occurs in extreme spacetimes. We also prevent coordinate singularities by carefully choosing the gauge source function. As a result of these changes, we manage to improve our threshold estimation results. In spherical symmetry, we show critical phenomena of a massless scalar field minimally coupled to the Einstein field equations. In axisymmetry, we study Brill gravitational waves in vacuum.

Speaker: Daniela Cors

11:45 → 11:50 Short break

11:50 → 12:20 Towards binary boson star simulations

Speaker: Florian Atteneder

Atteneder.pdf

12:20 → 14:00 Lunch break

14:00 → 15:00 Quantum fields out-of-equilibrium and information theory 2

Speaker: Stefan Flörchinger

15:00 → 15:15 Q&A

15:15 → 16:00 Coffee break

16:00 → 16:30 Magnetic catalysis in the (2+1)-dimensional Gross-Neveu model

Speaker: Michael Mandl

mandl_handout.pdf

16:30 → 17:00 Global conformal blocks on the plane from oscillator representations

Speaker: Tobias Hössel

Hossel.pdf

17:00 → 18:00 Fellow & PI meetings

Friday, 7 October

09:00 → 10:00 Quantum black holes 1

Speaker: Marc Casals

PhysikCombo_Leipzig_QFT_flat.pdf

10:00 → 10:15 Q&A

10:15 → 10:45 Coffee break

10:45 → 11:15 Gravitional entanglement & quantization of spacetime

Speaker: Kemal Döner

Doner.pdf

11:15 → 11:45 Hadamard property of the Unruh state on Kerr-de Sitter spacetime

Speaker: Christiane Klein

Klein.pdf

11:45 → 11:50 Short break

11:50 → 12:20 RTG General assembly

12:20 → 14:00 Lunch break

14:00 → 15:00 Quantum black holes 2

Speaker: Marc Casals

PhysikCombo_Leipzig_QFT_curved.pdf

15:00 → 15:15 Q&A