PBHs and GWs from T2-inflation and NANOGrav 15-year data
Mansoori S.A.H. Felegray F. Talebian A. Sami M.
1 August 2023Institute of Physics
Journal of Cosmology and Astroparticle Physics
2023#2023Issue 8
In this paper, we propose a novel mechanism in T2-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 T2 = 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.
gravitational waves and CMBR polarization , inflation , primordial black holes
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Faculty of Physics, Shahrood University of Technology, P.O. Box 3619995161, Shahrood, Iran
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
Centre for Cosmology and Science Popularization (CCSP), SGT University, Haryana, Gurugram, Delhi-NCR, 122505, India
Eurasian International Centre for Theoretical Physics, Astana, Kazakhstan
Chinese Academy of Sciences, 52 Sanlihe Rd, Xicheng District, Beijing, China
Faculty of Physics
School of Astronomy
Centre for Cosmology and Science Popularization (CCSP)
Eurasian International Centre for Theoretical Physics
Chinese Academy of Sciences
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