Theoretical Cosmology meeting

10May2019 13:00 - 17:00

Event

Speakers: Matthias Bartelmann (Heidelberg University), Nicola Tamanini (AEI Potsdam) and Marjorie Schillo (Uppsala University). Location: Leuven, Belgium.

Programme

13:00 – 14:00 Matthias Bartelmann (Heidelberg University) - An analytic approach to non-linear cosmic structure formation 

14:00 – 15:00 Nicola Tamanini(AEI Potsdam) - Cosmology with gravitational wave standard sirens: current results and future prospectives 

15:30 – 16:30 Marjorie Schillo (Uppsala University) - Accelerated expansion from decaying AdS

Abstracts

Matthias Bartelmann (Heidelberg University) 

An analytic approach to non-linear cosmic structure formation 

Numerical simulations of cosmic structure formation are impressively  successful. However, they have practical and conceptual disadvantages: they  are computationally expensive and thus not very flexible; and they reproduce,  but do not explain, the universal properties of cosmic structures. I will  present a new analytic approach to cosmic structures, which is based on a non- equilibrium statistical field theory for Hamiltonian particle systems. Its  main advantage is that it avoids the notorious shell-crossing problem by  construction and thus allows to enter deeply into the non-linear regime. I  will sketch the concepts of the theory and show the results of several  applications, e.g. to the cosmological standard model, axionic dark matter,  and modified theories of gravity.

Nicola Tamanini(AEI Potsdam)  

Cosmology with gravitational wave standard sirens: current results and future prospectives 

I will introduce the concept of standard siren, reviewing the methodologies that one can apply to probe the cosmic expansion using gravitational wave observations. I will then outline the gravitational wave sources that can be used as standard sirens for both Earth-based (LIGO/Virgo) and space-based (LISA) detectors, pointing out for which of them an electromagnetic counterpart is expected to be observed. I will then discuss the constraints on the Hubble constant recently obtained from GW170817, which represents the very first standard siren ever discovered, and discuss future cosmological prospects for LIGO/Virgo. Finally I will present cosmological forecasts for LISA, which will be able to probe the expansion of the universe at high redshift.

Marjorie Schillo (Uppsala University)

Accelerated expansion from decaying AdS

I will discuss a recent construction wherein an effective de Sitter spacetime appears as a non-supersymmetric AdS vacuum decays into the
supersymmetric vacuum. Four-dimensional observers are localized on a
spherical brane which nucleates to facilitate the decay. The expansion of
the brane bubble then leads to an effective four-dimensional de Sitter
space. This construction side-steps the difficulties of constructing
scale-separated de Sitter vacua or inflating spacetimes in traditional flux
compactifications. I will discuss new developments concerning
four-dimensional phenomenology and the embedding of the scenario in string
 theory.

Location

The meeting will take place at Mgr. Sencie Instituut (MSI1), Erasmusplein 2, 3000 Leuven. >>GoogleMaps

Organisers

Thomas Van Riet

Thomas Hertog 

Bert Vercnocke

About

These meetings occur (roughly) every month and are hosted by universities across the Netherlands and Belgium, gathering the local cosmology community. Some of these talks might be of interest also for string and the Amsterdam GRAPPA groups, so we encourage you to subscribe to the THC mailing list:

and to follow our website http://cosmology.nl/ to keep up to date on THC meetings dates and programs.

source: THC@NL

Published by  D-ITP