Belgian Gravitational Wave Meeting - October 27 2020

Session

Theory / Cosmology

27 Oct 2020, 14:00

Zoom

16. BMS balance laws in Einstein GR

Ali Seraj (ULB)

27/10/2020, 14:00

In this talk, I will present the generalized BMS symmetries and their associated charges. Then I will explain the corresponding balance equations which quantify the non-conservation of these charges as a result of the gravitational waves. I will also briefly mention their relationship with the gravitational memory effect.

18. Modular invariant partition function of gravitational waves with Casimir-type boundary conditions

Martin Bonte (ULB)

27/10/2020, 14:20

I would like to present a computation I have done. It is the partition of the quantum partition function at non-zero temperature of a spin-2 field (gravitational field at linearized level) in a setup close to the usual electromagnetic Casimir computation with perfectly conducting plates. The 3D geometry is a flat manifold with boundaries at z=0 and z=L (and infinitely extended in the two other...

19. Gravitational Waves from Super-Heavy Dark Matter

Iason Blades (ULB)

27/10/2020, 14:40

As a way of an introduction, I will briefly discuss some recent work on models of the early universe in which the abundance of dark matter is set by a period of late-time thermal inflation. Such scenarios terminate in very strong phase transitions which can be detected by upcoming gravitational wave interferometers.

20. Gravitational Waves from the inhomogeneous pre-inflationary era

Cristian Joana (UCLouvain)

27/10/2020, 15:00

We use of the 3+1 formalism of numerical relativity to investigate the robustness of Starobinsky and Higgs inflation to inhomogeneous initial conditions dominated by either scalar field gradients or by the kinetic energy density. Strong Sub-Hubble fluctuations generically lead to inflation after a dynamical phase driven by an oscillatory equation of state. On the other hand, Super-Hubble...

17. Low Energy SUSY-breaking and Gravitational Waves

Alberto Mariotti (VUB)

27/10/2020, 15:20

We begin the exploration of calculable SUSY-breaking hidden sectors delivering Gravitational Wave (GW) signals from first order phase transitions (FOPT). We discuss an extensive class of models where the FOPT is tied to the breaking of R-symmetry along the pseudo-flat direction universally related to SUSY-breaking. Once a mediaton scheme is specified, the frequency of the GW peaks correlates...