APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Encieh Erfani (IASBS)
Title: Dark Matter Primordial Black Holes and their Formation
Date (JST): Wed, Aug 10, 2016, 13:30 - 14:30
Place: Seminar Room A
Related File: 1722.pdf
Abstract: Primordial Black Holes (PBHs) are gravitationally collapsed objects that may have been created by density fuctuations caused by Inflation in the early universe. A broad range of single field models of inflation are analysed in light of all relevant recent cosmological data, checking whether they can lead to the formation of long-lived PBHs as candidate for dark matter (DM).
We also study the possibility that particle production during inflation can source the required power spectrum for DM PBH formation. We consider the scalar and the gauge quanta production in inflation models and we do not assume any specifc potential for the inflaton field. We show that in the gauge production case, the non-production of DM PBHs puts stronger upper bound on the particle production parameter. Our analysis show that this bound is more stringent than the bounds from the bispectrum and the tensor-to-scalar ratio derived by gauge production in these models. In the scenario where the inflaton field coupled to a scalar field, we put an upper bound on the amplitude of the generated scalar power spectrum by non-production of PBHs.