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Imprint of PBH domination on gravitational waves generated by cosmic strings

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arxiv 2304.11844 v2 pith:A5IOKM5N submitted 2023-04-24 hep-ph astro-ph.CO

Debasish Borah , Suruj Jyoti Das , Rishav Roshan , Rome Samanta This is my paper · ORCID
classification hep-phastro-ph.CO
keywords spectrumgeneratedbreakingcosmicdominationgravitationalongoingphase
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abstract

We study the effect of an ultra-light primordial black hole (PBH) dominated phase on the gravitational wave (GW) spectrum generated by a cosmic string (CS) network formed as a result of a high-scale $U(1)$ symmetry breaking. A PBH-dominated phase leads to tilts in the spectrum via entropy dilution and generates a new GW spectrum from PBH density fluctuations, detectable at ongoing and planned near-future GW detectors. The combined spectrum has a unique shape with a plateau, a sharp tilted peak over the plateau, and a characteristic fall-off, which can be distinguished from the one generated in the combination of CS and any other matter domination or new exotic physics. We discuss how ongoing and planned future experiments can probe such a unique spectrum for different values of $U(1)$ breaking scale and PBH parameters such as initial mass and energy fraction.

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  1. Non-Standard Thermal History and Formation of Primordial Black Holes in Einstein-Gauss-Bonnet Gravity

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    A tuned Einstein-Gauss-Bonnet inflation model can create primordial black holes from asteroid-sized to tens of solar masses and secondary gravitational waves, with abundances that change dramatically in a stiff post-i...

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