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• W2082497072 endingPage "6058" @default.
• W2082497072 startingPage "6040" @default.
• W2082497072 abstract "We investigate the recently proposed hybrid inflation models with two stages of inflation. We show that quantum fluctuations at the time corresponding to the phase transition between the two inflationary stages can trigger the formation of a large number of inflating topological defects. In order to study density perturbations in these models we further develop a method to calculate density perturbations in a system of two scalar fields. We show that density perturbations in hybrid inflation models of the new type can be very large on the scale corresponding to the phase transition. The resulting density inhomogeneties lead to a copious production of black holes. This could be an argument against hybrid inflation models with two stages of inflation. However, we find a class of models where this problem can be easily avoided. The number of black holes produced in these models can be made extremely small, but in general it could be sufficiently large to have important cosmological and astrophysical implications. In particular, for certain values of parameters these black holes may constitute the dark matter in the Universe. It is also possible to have hybrid models with two stages of inflation where the black hole production is not suppressed, but where the typical masses of the black holes are very small. Such models lead to a completely different thermal history of the Universe, where postinflationary reheating occurs via black hole evaporation." @default.
• W2082497072 created "2016-06-24" @default.
• W2082497072 creator A5011635269 @default.
• W2082497072 creator A5014587042 @default.
• W2082497072 creator A5019669411 @default.
• W2082497072 date "1996-11-15" @default.
• W2082497072 modified "2023-10-18" @default.
• W2082497072 title "Density perturbations and black hole formation in hybrid inflation" @default.
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• W2082497072 doi "https://doi.org/10.1103/physrevd.54.6040" @default.
• W2082497072 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10020609" @default.
• W2082497072 hasPublicationYear "1996" @default.
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