10-17 July 2019
Ghent
Europe/Brussels timezone

A general framework for modeling the small-scale power in non-standard cosmologies

12 Jul 2019, 16:30
20m
ICC - Baeckeland 1 (Ghent)

ICC - Baeckeland 1

Ghent

Parallel talk Cosmology Cosmology

Speaker

Riccardo Murgia (SISSA)

Description

Structure formation at small cosmological scales provides an important frontier for Dark Matter (DM) research.
So far, many non-cold DM (nCDM) candidates have been proposed in order to give a better description of the structure formation and distribution at small scales, with respect to the standard cold DM (CDM) model.
The details of the small-scale power suppression depend on the DM particle nature, allowing for a direct link between DM models and astrophysical observations. However, most of the constraints currently available refer to a very specific shape of the power suppression, corresponding to thermal warm DM. Nonetheless, most of the viable particle DM candidates are not characterised by a thermal momentum distribution.
In this talk, I will discuss an efficient method for constraining both thermal and non-thermal DM scenarios with the Lyman-alpha forest, based on a simple and flexible parametrisation capable to reproduce the small-scale clustering signal of a large set of nCDM models.
I will present the first astrophysical constraints on such parametrisation, easily translatable to bounds on the fundamental nCDM properties without the need to run any specific numerical simulations.

Primary author

Presentation Materials