Gravitino production by primordial black hole evaporation and constraints on the inhomogeneity of the early Universe

Details Gravitino production by primordial black hole evaporation and constraints on the inhomogeneity of the early Universe Gravitino production by primordial black hole evaporation and constraints on the inhomogeneity of the early Universe

2004-06-28

arxiv.org/abs/astro-ph/0406621v2

Class.Quant.Grav.23:1875-1882,2006

Astronomy and Astrophysics

Astrophysics

Published version. Minor changes, references added

Scientific paper

10.1088/0264-9381/23/6/004

In supergravity models, the evaporation of light Primordial Black Holes (PBHs) should be a source of gravitinos. By considering this process, new stringent limits are derived on the abundance of small black holes with initial masses less than 10^9 g. In minimal supergravity, the subsequent decay of evaporated gravitinos into cascades of non-equilibrium particles leads to the formation of elements whose abundance is constrained by observations. In gauge mediated supersymmetry breaking models, their density is required not to overclose the Universe. As a result, cosmological models with substantial inhomogeneities on small scales are excluded.

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