Document detail
ID
oai:arXiv.org:2410.10111
Topic
Astrophysics - Cosmology and Nonga... General Relativity and Quantum Cos... High Energy Physics - TheoryAuthor
Zhou, Jing-Zhi Kuang, Yu-Ting Chang, Zhe Lü, H.Category
sciences: astrophysics
Year
2024
listing date
1/8/2025
Keywords
$n_{\text{eff}}$ waves gravitational sigwsAbstract
In June 2023, multiple pulsar timing array collaborations provided evidence for the existence of a stochastic gravitational wave background.
Scalar induced gravitational waves (SIGWs), as one of the most likely sources of stochastic gravitational waves, have received widespread attention.
When primordial curvature perturbations on small scales are sufficiently large, \acp{PBH} inevitably form, concurrently producing SIGWs with significant observable effects.
These SIGWs can serve as an additional radiation component, influencing the relativistic degrees of freedom $N_{\text{eff}}$.
Taking into account primordial non-Gaussianity, we study the energy density spectrum of SIGWs up to the third order and use the current observational data of $N_{\text{eff}}$ to constrain small-scale primordial curvature perturbations and the abundance of \acp{PBH}.
;Comment: Accepted for publication in ApJ on 2025 January 5
Zhou, Jing-Zhi,Kuang, Yu-Ting,Chang, Zhe,Lü, H., 2024, Constraints on primordial black holes from $N_{\text{eff}}$ : scalar induced gravitational waves as an extra radiation component
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