13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

The formation of primordial black hole dark matter

16 Dec 2015, 15:05
20m
Level 2, Room 7&8 (International Conference Centre Geneva)

Level 2, Room 7&8

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva

Speaker

Sam Young (University of Sussex)

Description

There are strong theoretical arguments which suggest that primordial black holes (PBHs) may have formed from the collapse of large over-densities during the radiation dominated epoch shortly after the end of inflation. Because these black holes can form on much smaller scales than those visible from the CMB or large-scale structure, they have historically been used to place a unique constraint on the amplitude of the small-scale primordial power spectrum. In addition to their use in constraining the early universe, PBHs also represent a viable dark matter candidate, and the conditions required for the formation of a large enough number of PBHs to constitute dark matter will be discussed. A particular focus will be on a new method using CDM isocurvature perturbations arising from non-Gaussianity in the primordial universe. Isocurvature perturbations produced in such a manner lead to extremely tight constraints on non-Gaussianity, and provides a powerful tool to distinguish between inflationary models which could lead to the formation of PBH dark matter.

Primary author

Sam Young (University of Sussex)

Co-author

Christian Byrnes (University of Sussex (GB))

Presentation Materials