123 citations · 139 across the 2 of their papers we have counts for
4 papers
Does the detection of primordial gravitational waves exclude low energy inflation?
Tomohiro Fujita, Ryo Namba, Yuichiro Tada
We show that a detectable tensor-to-scalar ratio on the CMB scale can be generated even during extremely low energy inflation which saturates the BBN bound $ρ_{\rm…
Is the DBI scalar field as fragile as other -essence fields?
Shinji Mukohyama, Ryo Namba, Yota Watanabe
Caustic singularity formations in shift-symmetric -essence and Horndeski theories on a fixed Minkowski spacetime were recently argued. In dimensions, this singularity is the…
Consistent generation of magnetic fields in axion inflation models
Tomohiro Fujita, Ryo Namba, Yuichiro Tada +2
There has been a growing evidence for the existence of magnetic fields in the extra-galactic regions, while the attempt to associate their origin with the inflationary epoch alone…
Hamiltonian analysis of nonprojectable Hořava-Lifshitz gravity with symmetry
Shinji Mukohyama, Ryo Namba, Rio Saitou +1
We study the nature of constraints and count the number of degrees of freedom in the nonprojectable version of the extension of Hořava-Lifshitz gravity, using the standard m…