192 citations · 2.8k across the 75 of their papers we have counts for
8 papers · 1 filter
Can a spectator scalar field enhance inflationary tensor mode?
Tomohiro Fujita, Jun'ichi Yokoyama, Shuichiro Yokoyama
We consider the possibility of enhancing the inflationary tensor mode by introducing a spectator scalar field with a small sound speed which induces gravitational waves as a second…
Probing Beyond Standard Model via Hawking Radiated Gravitational Waves
Tomohiro Fujita
We propose a novel technique to probe the beyond standard model (BSM) of particle physics. The mass spectrum of unknown BSM particles can be scanned by observing gravitational wave…
Non-perturbative approach for curvature perturbations in stochastic- formalism
Tomohiro Fujita, Masahiro Kawasaki, Yuichiro Tada
In our previous paper, we have proposed a new algorithm to calculate the power spectrum of the curvature perturbations generated in inflationary universe with use of the stochastic…
Curvaton in large field inflation
Tomohiro Fujita, Masahiro Kawasaki, Shuichiro Yokoyama
We comprehensively explore the quadratic curvaton models in the chaotic inflation. In the light of the BICEP2 result , all model parameters and relevant observables…
Is there supercurvature mode of massive vector field in open inflation?
Daisuke Yamauchi, Tomohiro Fujita, Shinji Mukohyama
We investigate the Euclidean vacuum mode functions of a massive vector field in a spatially open chart of de Sitter spacetime. In the one-bubble open inflationary scenario that nat…
Void magnetic field and its primordial origin in inflation
Tomohiro Fujita
Since magnetic fields in galaxies, galactic clusters and even void regions are observed, theoretical attempts to explain their origin are strongly motivated. It is interesting to c…
Critical constraint on inflationary magnetogenesis
Tomohiro Fujita, Shuichiro Yokoyama
Recently, there are several reports that the cosmic magnetic fields on Mpc scale in void region is larger than G with an uncertainty of a few orders from the current…
Baryon Asymmetry, Dark Matter, and Density Perturbation from PBH
Tomohiro Fujita, Keisuke Harigaya, Masahiro Kawasaki +1
We investigate the consistency of a scenario in which the baryon asymmetry, dark matters, as well as the cosmic density perturbation are generated simultaneously through the evapor…