Conveners
Cosmology and Astroparticles session on Zoom and in Main Auditorium.
- Julia Harz
- Camilo Garcia Cely
Daniel Figueroa
25/09/2020, 13:30
Mr
Peera Simakachorn
(UHH and DESY)
25/09/2020, 14:00
Cosmology & Astroparticle Physics
A stochastic gravitational-wave (GW) background from cosmic strings spans a broad range of frequencies. By measuring the slope of its spectrum with future GW observatories, we can infer the equation of state of the universe much earlier than the onset of Big-Bang Nucleosynthesis (BBN). In this work, we consider a variety of cosmological scenarios beyond the standard hot-Big-Bang cosmology and...
Mr
Felix Giese
(DESY/Hamburg U.)
25/09/2020, 14:12
Cosmology & Astroparticle Physics
We study the energy budget of a first-order cosmological phase transition, which is an important factor in the prediction of the resulting gravitational wave spectrum. Formerly, this analysis was based mostly on simplified models as for example the bag equation of state. Here, we present a model-independent approach that is exact up to the temperature dependence of the speed of sound in the...
Mr
Juan S. Cruz
(Technical University Munich)
25/09/2020, 14:24
Cosmology & Astroparticle Physics
We study false vacuum decay for a gauged complex scalar field in a polynomial potential with nearly degenerate minima. Radiative corrections to the profile of the nucleated bubble as well as the full decay rate are computed in the planar thin-wall approximation using the effective action. This allows to account for the inhomogeneity of the bounce background and the radiative corrections in a...
Dr
Aleksandr Chatrchyan
(Heidelberg University, Institute for theoretical physics)
25/09/2020, 14:36
Cosmology & Astroparticle Physics
Axion-like particles (ALPs) play an important role in cosmology and, among others, are well motivated dark matter candidates. In the presence of a monodromy the discrete shift symmetry of ALPs can be broken, and this talk is devoted to the rich nonlinear dynamics that becomes available in such systems. We consider coherent oscillations of the field, which trigger the resonant amplification of...
Ricardo Landim
(Techinical University of Munich)
25/09/2020, 14:48
Cosmology & Astroparticle Physics
Extra dimensions (ED) have been used as attempts to explain several phenomena in particle physics, such as the hierarchy and flavor problems. The interaction between new mediators in the bulk (vector, scalar of fermion fields) and the Standard Model (SM) particles can be naturally suppressed if one employs a single, flat ED. In this setup, the SM fields are localized in a finite width ‘fat’...
