122 citations · 1k across the 49 of their papers we have counts for
6 papers · 1 filter
Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
Tomohiro Fujita, Ryo Namba, Ippei Obata
We study scalar-tensor-tensor cross correlation generated by the dynamics of interacting axion and SU(2) gauge fields during inflation. We quantize the quadra…
Axion Search with Ring Cavity Experiment
Ippei Obata, Tomohiro Fujita, Yuta Michimura
We suggest a novel experimental method to search for axion dark matter with an optical ring cavity. Our cavity measures the difference of the resonant frequencies between two circu…
Hunting for Statistical Anisotropy in Tensor Modes with B-mode Observations
Takashi Hiramatsu, Shuichiro Yokoyama, Tomohiro Fujita +1
We investigate a possibility of constraining statistical anisotropies of the primordial tensor perturbations by using future observations for the Cosmic Microwave Background (CMB)…
Footprint of Two-Form Field: Statistical Anisotropy in Primordial Gravitational Waves
Ippei Obata, Tomohiro Fujita
We study the observational signatures of two-form field in the inflationary cosmology. In our setup a two-form field is kinetically coupled to a spectator scalar field and generate…
Optical Ring Cavity Search for Axion Dark Matter
Ippei Obata, Tomohiro Fujita, Yuta Michimura
We propose a novel experiment to search for axion dark matter which differentiates the phase velocities of the left and right-handed polarized photons. Our optical cavity measures…
Statistically Anisotropic Tensor Modes from Inflation
Tomohiro Fujita, Ippei Obata, Takahiro Tanaka +1
We consider the inflationary universe with a spectator scalar field coupled to a gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that…