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We explicitly construct a double-field inflationary model, which satisfiesthe latest Planck constraints at the cosmic microwave background (CMB) scalesand produces the whole dark matter energy density as primordial black holes(PBHs), in the mass range $10^{-17}~M_{\odot}\lesssim M_{{}_{\rm PBH}}\lesssim10^{-13}~M_{\odot}$. The PBHs can be produced after the end of slow-rollinflation from the bubbles of true vacuum that nucleate during the course ofinflation. Obtaining PBHs in this mass range enforces the scale of inflation tobe extremely low, $10^{-7} \lesssim H \lesssim 10^{-3} ~{\rm GeV}$, which makesthe efforts to observe gravitational waves at the CMB scales futile, althoughit is high enough to allow for a successful big bang nucleosynthesis. We willshow that the shape of the mass distribution of the PBHs is dependent on howinflation ends and the Universe settles from the metastable direction to thetrue one. End of inflation can also be probed by examining the gravitationalwaves spectrum. In particular, we show that if exit from the rolling metastabledirection to the true vacuum of the potential happens through a first-orderphase transition after the end of slow-roll inflation, it leaves behind astochastic gravitational wave background (SGWB), which is potentiallyobservable by the Laser Interferometer Space Antenna. Examining the massdistribution of PBHs and possible SGWB from the end of inflation, we may beable to gain invaluable information about the end of inflation.

Examining the end of inflation with primordial black holes mass distribution and gravitational waves