4 papers
Unveiling Primordial Black Hole Relics Through Induced Gravitational Waves
Misao Sasaki, Jianing Wang
Black hole relics are of significant interest in cosmology and theoretical physics. In this work, we consider tiny primordial black holes (PBHs) ( $M_{\text {PBH }} \lesssim 10^7 \…
When Tiny Halos Stir Spacetime: Gravitational Waves from Fifth-Force Mergers
Xinpeng Wang, Yifan Lu, Zachary S. C. Picker +2
Dark matter fermions interacting via attractive fifth forces mediated by a light mediator can form dark matter halos in the very early universe. We show that bound systems composed…
Dip and non-linearity in the curvature perturbation from inflation with a transient non-slow-roll stage
Tomohiro Fujita, Ryodai Kawaguchi, Misao Sasaki +1
We consider models of inflation that contain a transient non-slow-roll stage and investigate the conditions under which a dip appears in the power spectrum of the curvature perturb…
A complete analysis of inflation with piecewise quadratic potential
Xinpeng Wang, Xiao-Han Ma, Misao Sasaki
We conduct a thorough study of the comoving curvature perturbation in single-field inflation with two stages, represented by a piecewise quadratic potential, where bo…