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Paper   IPM / Physic / 16414
School of Physics
  Title:   Charting the Landscape in Our Neighborhood from the PBHs Mass Distribution and the GWs
  Author(s): 
1.  A. Ashoorioon
2.  A. Rostami
3.  J. T. Firouzjaee
  Status:   Preprint
  Journal:
  Year:  2020
  Supported by:  IPM
  Abstract:
We explicitly construct a double field inflationary model, which satisfies the latest PLANCK constraints at the CMB scales and produces the whole dark matter energy density as primordial black holes (PBHs), in the mass range 10−17 M\odot <~MPBH <~10−13 M\odot. The PBHs are produced after the end of slow-roll inflation from the bubbles of true vacuum that nucleate during the course of inflation. Obtaining PBHs in this mass range, enforces the scale of inflation to be extremely low, 10−7 GeV <~H <~10−3  GeV, which makes the efforts to observe gravitational waves at the CMB scales futile, although it is high enough to allow for a successful nucleosynthesis. Instead, exit from the rolling metastable direction to the true vacuum of the potential may happen with a first-order phase transition (PT) that leaves behind a stochastic gravitational wave background (SGWB), which is potentially observable by LISA. We show that PBHs produced during such a first-order PT from the collision of bubble walls contribute negligibly to the PBH mass spectrum. Examining the mass distribution of PBHs and possible SGWB from the end of inflation, we may be able to gain invaluable information about the topography of the landscape in our neighborhood.

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