208 citations · 1.2k across the 28 of their papers we have counts for
9 papers · 1 filter
One-loop thermal radiation exchange in gravitational wave power spectrum
Atsuhisa Ota, Misao Sasaki, Yi Wang
The radiation-dominated universe is a key ingredient of the standard Big Bang cosmology. Radiation comprises numerous quantum elementary particles, and the macroscopic behavior of…
Axion-like Universal Gravitational Wave Interpretation of Pulsar Timing Array Data
Kaloian D. Lozanov, Shi Pi, Misao Sasaki +2
Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of…
Universal Gravitational Waves from Interacting and Clustered Solitons
Kaloian D. Lozanov, Misao Sasaki, Volodymyr Takhistov
Causal soliton formation (e.g. oscillons, Q-balls) in the primordial Universe is expected to give rise to a universal gravitational wave (GW) background, at frequencies smaller tha…
Extra-tensor-induced origin for the PTA signal: No primordial black hole production
Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama
Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. The origin of the PTA signal can be astrophysi…
Highly asymmetric probability distribution from a finite-width upward step during inflation
Ryodai Kawaguchi, Tomohiro Fujita, Misao Sasaki
We study a single-field inflation model in which the inflaton potential has an upward step between two slow-roll regimes by taking into account the finite width of the step. We cal…
New shape of parity-violating graviton non-Gaussianity
Jinn-Ouk Gong, Maria Mylova, Misao Sasaki
We show that the general vacuum states that respect the de Sitter symmetry, known as the α-vacua, can introduce non-vanishing parity-violating tensor non-Gaussianities. This is due…