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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 March
Contributed talk at LVK 2026 (HP)
Title: "Probing Majoron Dark Matter with Optical Interferometry" (Talk slides)
4 March
Submitted a paper
"The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles" (arXiv)
25 February
Submitted a paper
"On the Kalb-Ramond field with non-minimal coupling to gravity" (arXiv)
21 January
Contributed talk at JGRG34 (HP)
"Cosmic Birefringence from Large Lepton Asymmetry" (Talk slides)
26 December
Submitted a paper
"Implications of Cosmic Birefringence for Multi-Field ALP Dark Matter" (arXiv)
1 December
invited talk at the confererence "ASPIRE Miniworkshop" (HP) (1 December, University of Chicago)
Title: "Axion dark matter detection with the photon's birefringence effect" (Talk Slides)
18 November
invited talk at the conference "Parity Violation from Home 2025" (HP) (18-21 November, online)
Title: "CMB Birefringence from CNB" (Talk slides)
11 November
invited talk at the conference "Axions in Japan" (HP) (10-14 November, Kavli IPMU)
Title: "Cosmic birefringence and its implications for axion cosmology" (Talk Slides)
12 August
invited talk at the conference "VIETNAM COSMOLOGY 2025" (HP) (10-16 August, ICISE, Quy Nhon)
Title:"Cosmic Birefringence and Its Implications for Physics beyond the Standard Model" (Talk Slides)
21 July
Contributed talk at the PASCOS 2025 conference (HP) (21-25 July, Durham University, UK)
Title: "Probing Majoron Dark Matter with Optical Interferometry" (Talk Slides)
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