20 citations · 20 across the 1 of their papers we have counts for
6 papers
Analytic formula for the dynamics around inflation end and implications on primordial gravitational waves
Asuka Ito, Jiro Soda, Masahide Yamaguchi
We argue that primordial gravitational waves have a spectral break and its information is quite useful for exploring the early universe. Indeed, such a spectral break can be a fing…
Pulsar timing residual induced by ultralight vector dark matter
Kimihiro Nomura, Asuka Ito, Jiro Soda
We study the ultralight vector dark matter with a mass around . The vector field oscillating coherently on galactic scales induces oscillations of the spacet…
Accelerating Universe with a stable extra dimension in cuscuton gravity
Asuka Ito, Yuki Sakakihara, Jiro Soda
We study Kaluza-Klein cosmology in cuscuton gravity and find an exact solution describing an accelerating 4-dimensional universe with a stable extra dimension. A cuscuton which is…
Probing GHz Gravitational Waves with Graviton-magnon Resonance
Asuka Ito, Tomonori Ikeda, Kentaro Miuchi +1
A novel method for extending frequency frontier in gravitational wave observations is proposed. It is shown that gravitational waves can excite a magnon. Thus, gravitational waves…
Dressed Power-law Inflation with Cuscuton
Asuka Ito, Aya Iyonaga, Suro Kim +1
We study dressed inflation with a cuscuton and find a novel exact power-law solution. It is well known that the conventional power-law inflation is inconsistent with the Planck dat…
Searching for Bispectrum of Stochastic Gravitational Waves with Pulsar Timing Arrays
Makoto Tsuneto, Asuka Ito, Toshifumi Noumi +1
We study how to probe bispectra of stochastic gravitational waves with pulsar timing arrays. The bispectrum is a key to probe the origin of stochastic gravitational waves. In parti…