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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…
Effects of Gravitational Chern-Simons during Axion-SU(2) Inflation
Leila Mirzagholi, Eiichiro Komatsu, Kaloian D. Lozanov +1
In this paper, we examine the viability of inflation models with a spectator axion field coupled to both gravitational and SU(2) gauge fields via Chern-Simons couplings. Requiring…
How attractive is the isotropic attractor solution of axion-SU(2) inflation?
Ira Wolfson, Azadeh Maleknejad, Eiichiro Komatsu
The key to the phenomenological success of inflation models with axion and SU(2) gauge fields is the isotropic background of the SU(2) field. Previous studies showed that this isot…
δN formalism
Naonori S. Sugiyama, Eiichiro Komatsu, Toshifumi Futamase
Precise understanding of nonlinear evolution of cosmological perturbations during inflation is necessary for the correct interpretation of measurements of non-Gaussian correlations…
Non-Gaussianity Consistency Relation for Multi-field Inflation
Naonori S. Sugiyama, Eiichiro Komatsu, Toshifumi Futamase
While detection of the "local form" bispectrum of primordial perturbations would rule out all single-field inflation models, multi-field models would still be allowed. We show that…
Reheating of the universe after inflation with f(phi)R gravity
Yuki Watanabe, Eiichiro Komatsu
We show that reheating of the universe occurs spontaneously in a broad class of inflation models with f(phi)R gravity (phi is inflaton). The model does not require explicit couplin…