Constraining the history of reheating with the NANOGrav 15-year data
Over the last few years, primordial black holes (PBHs) have emerged as a strong candidate
for cold dark matter. A significant number of PBHs are produced when the strength of the
primordial scalar power spectrum is enhanced on small scales (compared to the COBE
normalized values on large scales). Such primordial spectra also inevitably lead to strong
amplification of the scalar-induced, secondary gravitational waves (GWs) at higher
frequencies. The recent detection of the stochastic gravitational wave background (SGWB) …
for cold dark matter. A significant number of PBHs are produced when the strength of the
primordial scalar power spectrum is enhanced on small scales (compared to the COBE
normalized values on large scales). Such primordial spectra also inevitably lead to strong
amplification of the scalar-induced, secondary gravitational waves (GWs) at higher
frequencies. The recent detection of the stochastic gravitational wave background (SGWB) …
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