Primordial Black Holes from Inflation with Nonminimal Derivative Coupling. (arXiv:1907.05042v1 [astro-ph.CO])

Primordial Black Holes from Inflation with Nonminimal Derivative Coupling. (arXiv:1907.05042v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Fu_C/0/1/0/all/0/1">Chengjie Fu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wu_P/0/1/0/all/0/1">Puxun Wu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yu_H/0/1/0/all/0/1">Hongwei Yu</a>

We propose a novel enhancement mechanism of the curvature perturbations in
the nonminimal derivative coupling inflation model with a coupling parameter
related to the inflaton field. By considering a special form of the coupling
parameter as a function of the inflaton, a period of ultra-slow-roll inflation
can be realized due to the gravitationally enhanced friction, and the resulting
power spectrum of the curvature perturbations has a sharp peak, which is large
enough to produce the primordial black holes. Under this mechanism, we can
easily obtain a sharp mass spectrum of primordial black holes around specific
masses such as $mathcal{O}(10)M_odot$, $mathcal{O}(10^{-5})M_odot$, and
$mathcal{O}(10^{-12})M_odot$, which can explain the LIGO events, the
ultrashort-timescale microlensing events in OGLE data, and the most of dark
matter, respectively.

We propose a novel enhancement mechanism of the curvature perturbations in
the nonminimal derivative coupling inflation model with a coupling parameter
related to the inflaton field. By considering a special form of the coupling
parameter as a function of the inflaton, a period of ultra-slow-roll inflation
can be realized due to the gravitationally enhanced friction, and the resulting
power spectrum of the curvature perturbations has a sharp peak, which is large
enough to produce the primordial black holes. Under this mechanism, we can
easily obtain a sharp mass spectrum of primordial black holes around specific
masses such as $mathcal{O}(10)M_odot$, $mathcal{O}(10^{-5})M_odot$, and
$mathcal{O}(10^{-12})M_odot$, which can explain the LIGO events, the
ultrashort-timescale microlensing events in OGLE data, and the most of dark
matter, respectively.

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