15 papers
Consistency relations of amplitude and phase fluctuations of gravitational waves magnified by strong gravitational lensing
Yuta Nakazono, Teruaki Suyama
We discuss the amplitude and phase fluctuations of gravitational waves due to wave optics lensing in the presence of both a strong lens and cosmological weak lenses. By applying th…
Graviton Floor
Himeka Matsuo, Asuka Ito, Kazunori Kohri +2
It has been observed that the Universe is permeated by the cosmic photon background, ranging from radio waves to gamma rays. We investigate the conversion of the photon background…
Quantum description of gravitational waves generated by a classical source
Felix Laga, Teruaki Suyama
We investigate the quantum properties of gravitational waves (GWs) generated by a classical energy-momentum tensor. Treating the GW field as a quantum field coupled to a classical…
Revisiting Constraints on Primordial Curvature Power Spectrum from PBH Abundances
Ashu Kushwaha, Teruaki Suyama
Primordial black holes (PBHs) can form in the early Universe, for instance during radiation domination, from the collapse of large-amplitude density perturbations shortly after hor…
Dark Matter Induced Scalarization as a Possible Solution to the Hyperon Puzzle
Suchana Adhikari, Teruaki Suyama
We investigate the properties of neutron stars when a massive scalar field, which could comprise all dark matter, is non-minimally coupled to the Ricci scalar. This coupling genera…
An upper limit on cosmological chiral gravitational wave background
Mohammad Ali Gorji, Ashu Kushwaha, Teruaki Suyama
Within the standard framework in which electroweak sphaleron processes relate lepton and baryon number, we derive an upper limit on the amplitude of a chiral gravitational wave bac…