Physik-Combo

Contribution List

1. Welcome

Holger Gies (TPI, FSU Jena)

29/03/2022, 10:50

2. Energy conditions and quantum energy inequalities

Chris Fewster

29/03/2022, 11:00

3. Q&A

29/03/2022, 12:00

4. Functional methods for cosmic large-scale structure formation

Alaric Erschfeld

29/03/2022, 14:30

5. Phase Transitions in a Yukawa-QCD Model

Richard Schmieden

29/03/2022, 16:00

Despite the standard model's great success at describing
particle physics phenomenology at currently accessible energies it is not considered to provide a fundamental description of nature. One problem of the SM is the so-called hierarchy problem.

In our study we employ the functional renormalization group to gain insights on the phase transition in a Yukawa-QCD toy model. We study the...

6. Background Effective Action with Nonlinear Massive Gauge Fixing

Dimitrios Gkiatas

29/03/2022, 16:30

Non-Abelian gauge theories constitute fundamental building blocks in the description of elementary particle interactions and exhibit by construction invariance under local gauge transformations.
Quantization entails a breaking of such symmetry, which is generally restored by imposing a constraint equation (e.g. Zinn-Justin equation), as well as a natural emergence of a global symmetry called...

8. Geometry of rotating discs in Einstein-Maxwell theory and the Ehrenfest paradox

David Rumler

30/03/2022, 09:00

In 1909 Ehrenfest formulated a famous paradox concerning a rigidly rotating disc (or cylinder originally) within special relativity. It caused a lot of debate and there is no general agreement on its solution. Directly related to the paradox is the question of spatial geometry of rotating discs.
In this talk, I will discuss the charged rotating disc of dust which is a concrete, physically...

9. Singularity theorems

Chris Fewster

30/03/2022, 09:30

10. Q&A

30/03/2022, 10:30

11. Characteristic Hadamard states and semi-classical gravitational collapse

Daan Janssen

30/03/2022, 11:15

To study the influence of quantum fields on the formation of a black hole, we show how locally covariant renormalization schemes for the stress-energy tensor for linear scalar fields can be adapted to a characteristic (i.e. null-cone) treatment of the semi-classical Einstein equations. Key to this approach is understanding the singularities of Hadamard parametrices restricted to null-cones. We...

12. Wedge-local observables in integrable models with bound states

Karim Shedid

30/03/2022, 11:45

13. Black hole spectroscopy and fundamental physics implications of gravitational wave ringdown observations

Gregorio Carullo

30/03/2022, 14:30

14. GW190521: a dynamical capture of two black holes

Rossella Gamba

30/03/2022, 16:00

Gravitational waves (GWs) represent a new channel to study the universe. They can lead to new --and at times unexpected-- discoveries about the nature of compact objects, such as black holes and neutron stars. However, our ability to extract the source properties from GW data crucially depends on the waveform models we employ to perform the analysis.
In this talk I will discuss the exemplary...

15. Critical gravitational collapse with the code bamps

Daniela Cors

30/03/2022, 16:30

Critical phenomena emerges as we approach the threshold between gravitational collapse and dispersed fields. We study this phenomena associated to the gravitational field alone, in vacuum, by evolving gravitational waves. The axisymmetry of this setup allows us to verify critical phenomena beyond spherical symmetry. More importantly, widening the variety of initial data we can test the...

16. Symmetry Breaking in Hydrodynamics and Holography

Seán Gray

31/03/2022, 09:00

Symmetries are abundant in physical theories but often broken by Nature. In this talk I will discuss symmetry breaking and how is it incorporated into hydrodynamics -- an effective theory for the late time dynamics of conserved quantities. Such hydrodynamic frameworks may in turn be tested by the means of the holographic duality, the principles of which will be presented and some results shown.

17. Large charge expansion

Susanne Reffert

31/03/2022, 09:30

18. Q&A

31/03/2022, 10:30

19. Chiral symmetry for a gauge theory with one adjoint fermion on the lattice

Ivan Soler

31/03/2022, 11:15

In this talk, I will focus on how to implement chiral symmetry on the lattice through the overlap operator. We apply this approach to one flavour adjoint QCD to study whether an infra-red conformal behavior is observed or not. Our simulation shows that, quite deep in the infra-red regime, a natural length appears in terms of the chiral condensate, a strong numerical hint that the theory is not...

20. One-Particle entanglement for one dimensional spinless fermions after an interaction quantum quench

Matthias Thamm

31/03/2022, 11:45

21. New Evidence for Anyons: Collisions and Braiding

Bernd Rosenow

31/03/2022, 14:30

Fermions and bosons are fundamental realizations of quantum statistics, which governs both the symmetry of the wave function under the interchange of particle coordinates and the probability for two particles being close to each other spatially. Anyons in the fractional quantum Hall effect are an example for quantum statistics intermediate between bosons and fermions. Two recent experiments...

7. Project talk