PBHs and GWs from 𝕋-inflation and NANOGrav 15-year data
Jul 13, 2023
8 pages
Published in:
- JCAP 08 (2023) 067
- Published: Aug 25, 2023
e-Print:
- 2307.06757 [astro-ph.CO]
View in:
Citations per year
Abstract: (IOP)
In this paper, we propose a novel mechanism in 𝕋-inflation to enhance the power spectrum large enough to seed primordial black holes (PBHs) formation. To accomplish this, we consider the coupling function between the inflaton field and 𝕋 = TμνTμν term. PBHs formed within this scenario can contribute partially or entirely to dark matter (DM) abundance. Furthermore, the amplification in the scalar power spectrum will concurrently produce significant scalar-induced gravitational waves (SIGWs) as a second-order effect. In addition, the energy spectrum associated with SIGWs can be compatible with the recent NANOGrav 15-year stochastic gravitational wave detection and fall into the sensitivity range of other forthcoming GW observatories.Note:
- 8 pages, 7 figures, and one table, references added, accepted by JCAP
- gravitational waves and CMBR polarization
- inflation
- primordial black holes
References(119)
Figures(7)
- [1]
- [2]
- [4]
- [5]
- [6]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [15]
- [16]
- [17]
- [18]
- [20]
- [21]
- [22]
- [24]