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Primordial blackholes and gravitational waves for an inflection-point model of inflation
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Primordial blackholes and gravitational waves for an inflection-point model of inflation
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In this article we provide a new closed relationship between cosmic abundance of primordial gravitational waves and primordial blackholes originated from initial inflationary perturbations for inflection-point models of inflation where inflation occurs below the Planck scale. The current Planck constraint on tensor-to-scalar ratio, running of the spectral tilt, and from the abundance of dark matter content in the universe, we can deduce a strict bound on the current abundance of primordial blackholes to be within a range, $9.99712\times 10^{-3}<\Omega_{PBH}h^{2}<9.99736\times 10^{-3}$.
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