8 citations · 16 across the 9 of their papers we have counts for
9 papers
Inflation and Reheating by Dynamical Torsion
Xiaolin Ma, Kamil Mudrunka, Kazunori Nakayama
In gravity theories with torsion, inflation can be driven by the dynamical torsion. Since it naturally has a derivative coupling to the axial current consisting of Standard Model p…
Anisotropy of Cosmic Background Photons from Annihilating/Decaying Dark Matter
Ryosuke Kasuya, Kazunori Nakayama
We provide a detailed formulation for calculating the angular power spectrum of the cosmic background photons arising from the dark matter decay or annihilation in a comprehensive…
High Frequency Spectrum of Primordial Gravitational Waves
Kamil Mudrunka, Kazunori Nakayama
During inflation long wavelength gravitational waves are produced, which form stochastic background in the present universe with very wide range of frequencies. Higher frequency gr…
Dynamical Prevention of Topological Defect Formation
Junseok Lee, Kai Murai, Kazunori Nakayama +1
Topological defects can have significant cosmological consequences, so their production must be examined carefully. It is usually assumed that topological defects are produced if t…
Inflation with Gauss-Bonnet correction: beyond slow-roll
Kamil Mudrunka, Kazunori Nakayama
If a coupling between the inflaton and the Gauss-Bonnet term is introduced, many models of inflation that were ruled out by the most recent Planck data can be made viable again. Th…
Domain walls in Nelson-Barr axion model
Kai Murai, Kazunori Nakayama
We explore a concrete realization of a Nelson-Barr model addressing the strong CP problem with suppressed unfavorable corrections. This model has a scalar field that spontaneously…
Revisiting the Minimal Nelson-Barr Model
Kai Murai, Kazunori Nakayama
We revisit the minimal Nelson-Barr model for solving the strong CP problem through the idea of spontaneous CP breaking. The minimal model suffers from the quality problem, which me…
Probing Gauss-Bonnet-Corrected Inflation with Gravitational Waves
Kamil Mudrunka, Kazunori Nakayama
The low energy effective action of quantum gravity may include the higher curvature terms such as the Gauss-Bonnet term. The inflaton dynamics may be affected by the Gauss-Bonnet t…
Misalignment production of vector boson dark matter from axion-SU(2) inflation
Tomohiro Fujita, Kai Murai, Kazunori Nakayama +1
We present a new mechanism to generate a coherently oscillating dark vector field from axion-SU(2) gauge field dynamics during inflation. The SU(2) gauge field acquires a nonzero b…