Publications of Ippei Obata

Nakai, Y.; Namba, R.; Obata, I.; Qiu, Y.-C.; Saito, R.: Can we explain cosmic birefringence without a new light field beyond Standard Model? Journal of High Energy Physics 2024 (1), 57 (2024)

Nakatsuka, H.; Morisaki, S.; Fujita, T.; Kume, J.; Michimura, Y.; Nagano, K.; Obata, I.: Stochastic effects on observation of ultralight bosonic dark matter. Physical Review D 108 (9), 092010 (2023)

Nakai, Y.; Namba, R.; Obata, I.: Peaky production of light dark photon dark matter. Journal of Cosmology and Astroparticle Physics 2023 (8), 032 (2023)

Obata, I.: Implications of the cosmic birefringence measurement for the axion dark matter search. Journal of Cosmology and Astroparticle Physics 2022 (9), 062 (2022)

Fujita, T.; Nakatsuka, H.; Obata, I.; Young, S.: Inflation with two-form field: the production of primordial black holes and gravitational waves. Journal of Cosmology and Astroparticle Physics 2022 (9), 017 (2022)

Gasparotto, S.; Obata, I.: Cosmic birefringence from monodromic axion dark energy. Journal of Cosmology and Astroparticle Physics 2022 (8), 025 (2022)

Fujita, T.; Murai, K.; Obata, I.; Shiraishi, M.: Gravitational wave trispectrum in the axion-SU(2) model. Journal of Cosmology and Astroparticle Physics 2022 (1), 007 (2022)

Nagano, K.; Nakatsuka, H.; Morisaki, S.; Fujita, T.; Yuta, M.; Obata, I.: Axion dark matter search using arm cavity transmitted beams of gravitational wave detectors. Physical Review D 104 (6), 062008 (2021)

Morisaki, S.; Fujita, T.; Michimura, Y.; Nakatsuka, H.; Obata, I.: Improved sensitivity of interferometric gravitational-wave detectors to ultralight vector dark matter from the finite light-traveling time. Physical Review D 103 (5), L051702 (2021)

Hiramatsu, T.; Murai, K.; Obata, I.; Yokoyama, S.: Statistically-anisotropic tensor bispectrum from inflation. Journal of Cosmology and Astroparticle Physics 2021 (3), 47 (2021)

Fujita, T.; Obata, I.; Tanaka, T.; Yamada, K.: Resonant gravitational waves in dynamical Chern–Simons–axion gravity. Classical and Quantum Gravity 38 (4), 045010 (2020)

Michimura, Y.; Fujita, T.; Morisaki, S.; Nakatsuka, H.; Obata, I.: Ultralight vector dark matter search with auxiliary length channels of gravitational wave detectors. Physical Review D 102 (10), 102001 (2020)