23 citations · 83 across the 9 of their papers we have counts for
4 papers · 1 filter
Ghost-free 2-form fields in cosmology: implications for gravitational parity violation
Yuki Horii, Tomoaki Murata, Tsutomu Kobayashi
We explore the possibility of parity-violating, nonminimally coupled 2-form field theories that retain the same dynamical degrees of freedom as a massive 2-form and thus are ghost-…
How does SU()-natural inflation isotropize the universe?
Tomoaki Murata, Tomohiro Fujita, Tsutomu Kobayashi
We study the homogeneous and anisotropic dynamics of pseudoscalar inflation coupled to an SU() gauge field. To see how the initially anisotropic universe is isotropized in such…
Dynamics of inflation with mutually orthogonal vector fields in a closed universe
Tomoaki Murata, Tsutomu Kobayashi
We study the dynamics of a homogeneous, isotropic, and positively curved universe in the presence of a SU(2) gauge field or a triplet of mutually orthogonal vector fields. In the S…
The isotropic attractor solution of axion-SU(2) inflation: Universal isotropization in Bianchi type-I geometry
Ira Wolfson, Azadeh Maleknejad, Tomoaki Murata +2
SU(2) gauge fields coupled to an axion field can acquire an isotropic background solution during inflation. We study homogeneous but anisotropic inflationary solutions in the prese…