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- Publications
- Influence
Saichania chulsanensis (Ornithischia,Ankylosauridae) from the Upper Cretaceous of Mongolia
- K. Carpenter, S. Hayashi, +4 authors I. Obata
- Geology
- 22 August 2011
Optical Ring Cavity Search for Axion Dark Matter.
- I. Obata, Tomohiro Fujita, Y. Michimura
- Physics, Medicine
- Physical review letters
- 30 May 2018
We propose a novel experiment to search for axion dark matter that differentiates the phase velocities of the left- and right-handed polarized photons. Our optical cavity measures the difference of… Expand
Non-sphericity of ultra-light axion dark matter halos in the Galactic dwarf spheroidal galaxies
- K. Hayashi, I. Obata
- Physics
- 8 February 2019
Ultralight-axion (ULA) dark matter is one of the possible solutions to resolve small-scale problems, especially the core-cusp problem. This is because ULA dark matter can create a central soliton… Expand
Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
We study scalar-tensor-tensor cross correlation $\langle \zeta hh \rangle$ generated by the dynamics of interacting axion and SU(2) gauge fields during inflation. We quantize the quadratic action and… Expand
Chiral primordial gravitational waves from dilaton induced delayed chromonatural inflation
We study inflation driven by a dilaton and an axion, both of which are coupled to a SU(2) gauge field. We find that the inflation driven by the dilaton occurs in the early stage of inflation during… Expand
Oscillating Chiral Tensor Spectrum from Axionic Inflation
We study the axionic inflation with a modulated potential and examine if the primordial tensor power spectrum exhibits oscillatory feature, which is testable with future space-based gravitational… Expand
Axion Dark Matter Search with Interferometrie Gravitational Wave Detectors
- K. Nagano, I. Obata, T. Fujita, Y. Michimura
- Physics
- 1 February 2020
Improved sensitivity of interferometric gravitational wave detectors to ultralight vector dark matter from the finite light-traveling time
- S. Morisaki, T. Fujita, Y. Michimura, H. Nakatsuka, I. Obata
- Physics
- 6 November 2020
Recently several studies have pointed out that gravitational-wave detectors are sensitive to ultralight vector dark matter and can improve the current best constraints given by the Equivalence… Expand