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Paper   IPM / Physic / 16920
School of Physics
  Title:   Non-Gaussianity and secondary gravitational waves from primordial black holes production in α-attractor inflation
1.  K. Rezazadeh
2.  Z. Teimoori
3.  K. Karami
  Status:   Preprint
  Year:  2022
  Supported by:  IPM
We study the non-Gaussianity and secondary Gravitational Waves (GWs) in the process of the Primordial Black Holes (PBHs) production from inflation. In our work, we focus on the α-attractor inflation model in which a tiny bump in the inflaton potential enhances the amplitude of the curvature perturbations at some scales, and consequently leads to the PBHs production with different mass scales. We implement the computational code BINGO which calculates the non-Gaussianity parameter in different triangle configurations. Our examination implies that in this model, the non-Gaussianity gets amplified significantly in the equilateral shape around the scales in which the power spectrum of the scalar perturbations peaks. The imprints of these non-Gaussianities can be probed in the scales corresponding to the BBN and μ-distortion events, or in smaller scales, and detection of such signatures in the future observations may confirm the idea of our model for generation of PBHs or rule it out. Moreover, we investigate the secondary GWs in this framework and show that in our model, the peak of the present fractional energy density as ΩGW0  ∼ 10−8 at different frequencies which depends on the model parameters. These results lies well within the sensitivity region of some GWs detectors at some frequencies, and therefore the observational compatibility of our model can be appraised by the forthcoming data from these detectors. We further provide some estimations for the tilts of the included GWs spectrum in the different intervals of frequency, and demonstrate that the spectrum obeys the power-law relation ΩGW0 ∼ fn in those frequency bands.

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