2000 character limit reached
Nonlinear resonant oscillation of gravitational potential induced by ultralight axion in $f(R)$ gravity (1703.03589v2)
Published 10 Mar 2017 in astro-ph.CO, gr-qc, hep-ph, and hep-th
Abstract: We study the ultralight axion dark matter with mass around $10{-22}$ eV in $f(R)$ gravity which might resolve the dark energy problem. In particular, we focus on the fact that the pressure of the axion field oscillating in time produces oscillations of gravitational potentials. We show that the oscillation of the gravitational potential is sensitive to the model of gravity. Remarkably, we find that the detectability of the oscillation through the gravitational wave detectors can be significantly enhanced due to the nonlinear resonance between the ultralight axion and the scalaron.