Primordial black holes in nonminimal derivative coupling inflation with quartic potential and reheating consideration

Abstract

We investigate the generation of primordial black holes (PBHs) with the aid of gravitationally increased friction mechanism originated from the nonminimal field derivative coupling (NMDC) to gravity framework, with the quartic potential. Applying the coupling parameter as a two-parted function of inflaton field and fine-tuning of five parameter assortments we can acquire ultra slow-roll phase to slow down the inflaton field due to high friction. This enables us to achieve enough enhancement in the amplitude of curvature perturbations power spectra to generate PBHs with different masses. The reheating stage is considered to obtain criteria for PBHs generation during radiation dominated era. We demonstrate that three cases of asteroid mass PBHs (10-12M⊙, 10-13M⊙, and 10-15M⊙) can be very interesting candidates for comprising 100% , 98.3% and 99.1% of the total dark matter (DM) content of the universe. Moreover, we analyse the production of induced Gravitational Waves (GWs), and illustrate that their spectra of current density parameter (ΩGW0) for all parameter Cases foretold by our model have climaxes which cut the sensitivity curves of GWs detectors, ergo the veracity of our outcomes can be tested in light of these detectors. At last, our numerical results exhibit that the spectra of ΩGW0 behave as a power-law function with respect to frequency, ΩGW0(f)∼(f/fc)n, in the vicinity of climaxes. Also, in the infrared regime f≪fc, the power index satisfies the relation n=3-2/ln(fc/f).