Scalar induced gravitational waves in inflation with gravitationally enhanced friction

Abstract

We study the scalar induced gravitational wave (GW) background in inflation with gravitationally enhanced friction (GEF). The GEF mechanism, which is realized by assuming a nonminimal derivative coupling between the inflaton field and gravity, is used to amplify the small-scale curvature perturbations to generate a sizable amount of primordial black holes. We find that the GW energy spectra can reach the detectable scopes of the future GW projects, and the power spectrum of curvature perturbations has a power-law form in the vicinity of the peak. The scaling of the GW spectrum in the ultraviolet regions is two times that of the power spectrum slope, and has a lower bound. In the infrared regions, the slope of the GW spectrum can be described roughly by a log-dependent form. These features of the GW spectrum may be used to check the GEF mechanism if the scalar induced GWs are detected in the future.

17 pages, 5 figures, 1 table

References in corpus (10)

• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• Gravitational-wave sensitivity curves
• The cosmological gravitational wave background from primordial density perturbations
• Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
• Primordial black hole dark matter from single field inflation
• No large population of unbound or wide-orbit Jupiter-mass planets
• Primordial Black Holes and Slow-Roll Violation
• A new cosmic microwave background constraint to primordial gravitational waves
• UV-Protected Inflation
• Resonant multiple peaks in the induced gravitational waves

Cited by in corpus (4)

• Gravitational Waves Induced by Scalar Perturbations with a Lognormal Peak
• Thermal History of the Early Universe and Primordial Gravitational Waves from Induced Scalar Perturbations
• Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate non-inflationary phase
• On the waveform of the scalar induced gravitational waves