Primordial black holes from passive density fluctuations
نویسندگان
چکیده
منابع مشابه
Classicality of primordial fluctuations and Primordial Black Holes
The production of Primordial Black Holes (PBH) from inflationary perturbations provides a physical process where the effective classicality of the fluctuations does not hold for certain scales. For adiabatic perturbations produced during inflation, this range of scales corresponds to PBH with masses M ≪ 1015 g. For PBH with masses M ∼ MH(te), the horizon mass at the end of inflation, the genera...
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Primordial black holes (PBHs) could have formed in the early universe from the collapse of overdense regions through significant density fluctuations. Their detection nowadays is a great challenge as it could allow both to check the Hawking evaporation mechanism and to probe the early universe on very small scales that remain totally out of the range investigated by CMB or LSS measurements. The...
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We re-examine the constraints on the density perturbation spectrum, including its spectral index n, from the production of primordial black holes. The standard cosmology, where the Universe is radiation dominated from the end of inflation up until the recent past, was studied by Carr, Gilbert and Lidsey; we correct two errors in their derivation and find a significantly stronger constraint than...
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The emission of particles from black holes created in the early Universe has detectable astrophysical consequences. The most stringent bound on their abundance has been obtained from the absence of a detectable diffuse flux of 100 MeV photons. Further scrutiny of these bounds is of interest as they, for instance, rule out primordial black holes as a dark matter candidate. We here point out that...
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We investigate the recently proposed natural double inflation model in supergravity. Chaotic inflation first takes place by virtue of the Nambu-Goldstone like shift symmetry. During chaotic inflation, an initial value of second inflation (new inflation) is set, which is adequately far from the local maximum of the potential due to the small linear term in the Kähler potential. Then, primordial ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2013
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2012.12.052