Primordial black holes and gravitational waves in nonstandard cosmologies

Show simple item record Bhattacharya, Sukannya Mohanty, Subhendra Parashari, Priyank 2020-09-21T14:18:36Z 2020-09-21T14:18:36Z 2020-08
dc.identifier.citation Bhattacharya, Sukannya; Mohanty, Subhendra and Parashari, Priyank, "Primordial black holes and gravitational waves in nonstandard cosmologies", Physical Review D, DOI: 10.1103/PhysRevD.102.043522, vol. 102, no. 4, Aug. 2020. en_US
dc.identifier.issn 2470-0010
dc.identifier.issn 2470-0029
dc.identifier.uri 10.1103/PhysRevD.102.043522
dc.description.abstract For primordial black holes (PBHs) to form a considerable fraction of cold dark matter, the required amplitude of primordial scalar perturbations is quite large (P?(k)?10?2) if PBH is formed in radiation epoch. In alternate cosmological histories, where additional epoch of arbitrary equation of state precede radiation epoch, the dynamics of PBH formation and relevant mass ranges can be different leading to lower requirement of primordial power at smaller scales of inflation. Moreover, this alternate history can modify the predictions for the gravitational wave (GW) spectrum, which can be probed by upcoming GW observations. In this paper we show that an early kination epoch can lead to percent level abundance of PBH for a lower amplitude of P?(k) as compared to PBH formation in a standard radiation epoch. Moreover, we calculate the effect of early kination epoch on the GW spectrum for first and second orders in perturbation theory which show enhancement in the amplitude of the GW spectrum in a kination epoch with respect to that in a standard radiation epoch.
dc.description.statementofresponsibility by Sukannya Bhattacharya, Subhendra Mohanty and Priyank Parashari
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.subject Cosmology en_US
dc.subject Evolution of the Universe en_US
dc.subject Gravitation, Cosmology & Astrophysics en_US
dc.title Primordial black holes and gravitational waves in nonstandard cosmologies en_US
dc.type Article en_US
dc.relation.journal Physical Review D

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