Scalar induced gravity waves from ultra slow-roll Galileon inflation

Abstract

We consider the production of secondary gravity waves in Galileon inflation with an ultra-slow roll (USR) phase and show that the spectrum of scalar-induced gravitational waves (SIGWs) in this case is consistent with the recent NANOGrav 15-year data and with sensitivities of other ground and space-based missions, LISA, BBO, DECIGO, CE, ET, HLVK (consists of aLIGO, aVirgo, and KAGRA), and HLV(03). Thanks to the non-renormalization property of Galileon theory, the amplitude of the large fluctuation is controllable at the sharp transitions between SR and USR regions. We show that the behaviour of the GW spectrum, when one-loop effects are included in the scalar power spectrum, is preserved under a shift of the sharp transition scale with peak amplitude ${\Omega }_{\mathrm{GW}}{h}^2\sim \mathcal{O}(10^{-6})$, and hence it can cover a wide range of frequencies within $\mathcal{O}(10^{-9}\mathrm{Hz}-10^7\mathrm{Hz})$. An analysis of the allowed mass range for primordial black holes (PBHs) is also performed, where we find that mass values ranging from $\mathcal{O}(1M_{\odot }-10^{-18}{M}_{\odot })$ can be generated over the corresponding allowed range of low and high frequencies.

29 pages, 5 figures, Comments are welcome, Accepted for publication in Nuclear Physics B

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