2 papers
astro-ph.CO2023
Hellings-Downs curve deformed by ultralight vector dark matter
Hidetoshi Omiya, Kimihiro Nomura, Jiro Soda
Pulsar timing arrays (PTAs) provide a way to detect gravitational waves (GWs) at nanohertz frequencies. To ensure the detection of GWs, observational data must exhibit the Hellings…
gr-qc2023
Entropy Bound and a Geometrically Nonsingular Universe
Takamasa Kanai, Kimihiro Nomura, Daisuke Yoshida
Bousso's entropy bound is a conjecture that the entropy through a null hypersurface emanating from a two-dimensional surface with a nonpositive expansion is bounded by the area of…