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Paper   IPM / Astronomy / 17583
School of Astronomy
  Title:   Inflation from Multiple Pseudo-scalar Fields: Primordial Black Hole Dark Matter and Gravitational Waves
1.  A. Talebian
2.  Seyed A. Hosseini Mansoori
3.  H. Firouzjahi
  Status:   Published
  Journal: Astrophysical Journal
  Vol.:  948
  Year:  2023
  Supported by:            ipm IPM
We study a model of inflation with multiple pseudo-scalar fields coupled to a U(1) gauge field through Chern-Simons interactions. Because of parity violating interactions, one polarization of the gauge field is amplified yielding to enhanced curvature perturbation power spectrum. Inflation proceeds in multiple stages as each pseudo-scalar field rolls towards its minimum yielding to distinct multiple peaks in the curvature perturbations power spectrum at various scales during inflation. The localized peaks in power spectrum generate Primordial Black Holes (PBHs) which can furnish a large fraction of Dark Matter (DM) abundance. In addition, gravitational waves (GWs) with non-trivial spectra are generated which are in sensitivity range of various forthcoming GW observatories.

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