Primordial black holes and third order scalar induced gravitational waves

Abstract

The process of \acp{PBH} formation would be inevitably accompanied by \acp{SIGW}. This strong correlation between \acp{PBH} and \acp{SIGW} signals could be a promising approach to detecting \acp{PBH} in the upcoming \ac{GW} experiments, such as \ac{LISA}. We investigate the third order \acp{SIGW} during a \ac{RD} era in the case of a monochromatic primordial power spectrum ${\mathcal{P}}_{\zeta }=A_{\zeta }{k}_{\ast }\delta \left(k-k_{\ast }\right)$. For \ac{LISA} observations, the relations between \ac{SNR} and monochromatic primordial power spectrum are studied systematically. It shows that the effects of third order \acp{SIGW} extend the cutoff frequency from $2f_{\ast }$ to $3f_{\ast }$ and lead to about $200\%$ increase of the \ac{SNR} for frequency band from $10^{-5}$Hz to $1.6\times 10^{-3}$Hz corresponding to \acp{PBH} with mass range $4\times 10^{-12}{M}_{\odot }\sim 10^{-7}{M}_{\odot }$. We find that there exists a critical value $A_{\ast }=1.76\times 10^{-2}$ for the amplitude of the monochromatic primordial power spectra, such that when $A_{\zeta }>A_{\ast }$, the energy density of third order \acp{SIGW} will be larger than the energy density of second order \acp{SIGW}.

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• Ultra-Slow-Roll Inflation on the Lattice I: Backreaction and Nonlinear Effects
• Scalar induced gravitational waves in chiral scalar-tensor theory of gravity
• Multiple peaks in gravitational waves induced from primordial curvature perturbations with non-Gaussianity
• Beware of the running $n_s$ when producing heavy primordial black holes
• Primordial gravitational waves and curvature perturbations induced energy density perturbation
• Scalar-induced gravitational waves in spatially covariant gravity
• Inflationary $\alpha$-Attractor Models with Singular Derivative of Potential
• Spectrum of third-order tensor perturbations induced by excited scalar fields