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Webmaster：Ippei Obata
Affiliation：Institute of Particle and Nuclear Studies, KEK (Tsukuba, Japan)
Research Interest：Parity-violation in cosmology
Research Activities：Publication List
E-mail：iobata_at_post.kek.jp（_at_→@）
News
10 May
Submitted a paper
"Adjusting optical cavity birefringence with wavelength tunable laser for axion searches" (arXiv)
2 April
Contributed talk at LeCosPA Meets IPMU (HP) (31 March - 2 April)
Title: "Parity Violation Meets Cosmic Birefringence: Implications for fundamental physics" (Talk Slides)
4 March
Contributed talk as a LOC member at YU Workshop 2025 (HP) (4-5 March)
Title: "Axionic defects in the CMB: birefringence and gravitational waves" (Talk Slides)
27 January
invited talk at the conference "CMB B-mode - NEXT" (HP) (27-29 January, KEK)
Title:"Cosmic Birefringence" (Talk Slides)
2 December
Contributed talk at the JGRG 33 (HP) (2-6 December, Kindai University)
Title: "Can gravitational wave detectors meet the Majoron?" (Talk Slides)
21 November
Invited (contribute) talk at the online workshop "Parity Violation from Home" (HP) (19-22 November)
Title: "Parity-violating scalar trispectrum from a rolling axion during inflation" (Talk Slides)
15 November
Paper "Constraining ultralight ALP dark matter in light of cosmic birefringence" is published in PRD (Link)
30 October
Paper "Testing Gravity with Frequency-Dependent Overlap Reduction Function in Pulsar Timing Array" is published in JCAP (Link)
24 October
Contributed talk at the COSMO 2024 conference (HP) (21-25 October, Kyoto University)
Title:"Axionic defects in the CMB: birefringence and gravitational waves" (Talk Slides)
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