Saito Ryo

Profile Information

Affiliation: Yamaguchi University

Degree: 理学博士(東京大学)

Researcher number: 70781392
J-GLOBAL ID: 201801012585869437
researchmap Member ID: 7000022346

Research Interests

Research Areas

Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics /

Research History

Apr, 2022 - Present

Graduate School of Sciences and Technology for Innovation, Yamaguchi University
Apr, 2017 - Mar, 2022

Assistant Professor, Graduate School of Sciences and Technology for Innovation, Yamaguchi University
Apr, 2016 - Mar, 2017

Research Assistant Professor, Yukawa Institute for Theoretical Physics, Kyoto University
Apr, 2014 - Mar, 2016

Researcher JSPS Postdoctoral Fellowship for Research Abroad, Laboratory AstroParticle and Cosmology, Université Paris Diderot
Apr, 2011 - Mar, 2014

JSPS Research Fellowships for Young Scientists (PD), Yukawa Institute for Theoretical Physics, Kyoto University

Education

Apr, 2006 - Mar, 2011

Department of Physics, School of Science, The University of Tokyo
Apr, 2002 - Mar, 2006

Department of Physics, School of Science, The University of Tokyo

Papers

Can we explain cosmic birefringence without a new light field beyond Standard Model?

Yuichiro Nakai, Ryo Namba, Ippei Obata, Yu-Cheng Qiu, Ryo Saito

Journal of High Energy Physics, 2024(1), Jan 11, 2024 Peer-reviewedCorresponding author
Ostrogradsky mode in scalar–tensor theories with higher-order derivative couplings to matter

Atsushi Naruko, Ryo Saito, Norihiro Tanahashi, Daisuke Yamauchi

Progress of Theoretical and Experimental Physics, 2023(5), Apr 13, 2023 Peer-reviewedCorresponding author
Antipodal angular correlations of inflationary stochastic gravitational wave background

Zhen-Yuan Wu, Nobuyuki Sakai, Ryo Saito

Physical Review D, 107(2), Jan 3, 2023 Peer-reviewed
Unified approach to secondary effects on the CMB B-mode polarization

Toshiya Namikawa, Atsushi Naruko, Ryo Saito, Atsushi Taruya, Daisuke Yamauchi

Journal of Cosmology and Astroparticle Physics, 2021(10) 029-029, Oct 1, 2021 Peer-reviewedCorresponding author
Dynamical analysis of screening in scalar-tensor theory

Tomohiro Nakamura, Taishi Ikeda, Ryo Saito, Norihiro Tanahashi, Chul-Moon Yoo

Physical Review D, 103(2), Jan 8, 2021 Peer-reviewed
Local-gravity test of unified models of inflation and dark energy in f(R) gravity

Mai Yashiki, Nobuyuki Sakai, Ryo Saito

Physical Review D, 102(4), Aug 5, 2020 Peer-reviewed
Is the trans-Planckian censorship a swampland conjecture?

Ryo Saito, Satoshi Shirai, Masahito Yamazaki

Physical Review D, 101(4), Feb 19, 2020 Peer-reviewedCorresponding author
Space gravitational-wave antennas DECIGO and B-DECIGO

Seiji Kawamura, Takashi Nakamura, Masaki Ando, Naoki Seto, Tomotada Akutsu, Ikkoh Funaki, Kunihito Ioka, Nobuyuki Kanda, Isao Kawano, Mitsuru Musha …

International Journal of Modern Physics D, 28(12) 1845001-1845001, Sep, 2019 Peer-reviewed
Phenomenological Consequences of the Refined Swampland Conjecture

Hajime Fukuda, Ryo Saito, Satoshi Shirai, Masahito Yamazaki

PHYSICAL REVIEW D, 99(8), Apr, 2019 Peer-reviewed
Chameleon field in a spherical shell system

Tomohiro Nakamura, Taishi Ikeda, Ryo Saito, Chul-Moon Yoo

PHYSICAL REVIEW D, 99(4), Feb, 2019 Peer-reviewed
Scalar-tensor theories and modified gravity in the wake of GW170817

David Langlois, Ryo Saito, Daisuke Yamauchi, Karim Noui

Physical Review D, 97(6), Mar 15, 2018 Peer-reviewed
Towards strong field tests of beyond Horndeski gravity theories

Jeremy Sakstein, Eugeny Babichev, Kazuya Koyama, David Langlois, Ryo Saito

PHYSICAL REVIEW D, 95(6), Mar, 2017 Peer-reviewed
Relativistic stars in beyond Horndeski theories

Eugeny Babichev, Kazuya Koyama, David Langlois, Ryo Saito, Jeremy Sakstein

CLASSICAL AND QUANTUM GRAVITY, 33(23), Dec, 2016 Peer-reviewed
Beyond Fab Four

E. Babichev, C. Charmousis, D. Langlois, R. Saito

CLASSICAL AND QUANTUM GRAVITY, 32(24) 046022, Dec, 2015 Peer-reviewedCorresponding author
Modified gravity inside astrophysical bodies

Ryo Saito, Daisuke Yamauchi, Shuntaro Mizuno, Jerome Gleyzes, David Langlois

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, (6), Jun, 2015 Peer-reviewed
Features in the CMB spectrum as an evidence of heavy physics

Ryo Saito

The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012, (210699) 648-662, 2015 Peer-reviewed
Combined features in the primordial spectra induced by a sudden turn in two-field DBI inflation

Shuntaro Mizuno, Ryo Saito, David Langlois

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, (11), Nov, 2014 Peer-reviewed
Geodesic curve-of-sight formulae for the cosmic microwave background: a unified treatment of redshift, time delay, and lensing

Ryo Saito, Atsushi Naruko, Takashi Hiramatsu, Misao Sasaki

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, (10), Oct, 2014 Peer-reviewed
Coleman-de Luccia instanton in dRGT massive gravity

Ying-li Zhang, Ryo Saito, Dong-han Yeom, Misao Sasaki

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, (2), Feb, 2014 Peer-reviewed
Localized features in non-Gaussianity from heavy physics

Ryo Saito, Yu-Ichi Takamizu

Journal of Cosmology and Astroparticle Physics, 2013(6) 031, Jun, 2013 Peer-reviewed

Misc.

Gravitational Positivity for Phenomenologists: Dark Gauge Boson in the Swampland

Katsuki Aoki, Toshifumi Noumi, Ryo Saito, Sota Sato, Satoshi Shirai, Junsei Tokuda, Masahito Yamazaki

May, 2023
「インフレーションと原始重力波」～重力波でみる「宇宙のはじまり」～

齊藤遼

数理科学, (2018年12月号), Nov, 2018 Invited
10aSE-5 Space Gravitational Wave Antenna DECIGO(21) : Its Science 1

Yokoyama Jun'ichi, Saito Ryo

Meeting abstracts of the Physical Society of Japan, 64(2) 33-33, Aug 18, 2009
21pZK-6 Non-Gaussianity in a single inflation model

Saito Ryo, Nagata Ryo, Yokoyama Jun'ichi

Meeting abstracts of the Physical Society of Japan, 62(2) 101-101, Aug 21, 2007

Books and Other Publications

宇宙と時間

(Role: Contributor, 第１章宇宙の始まり)

恒星社厚生閣, Apr 22, 2024 (ISBN: 4769917015)

Presentations

Ostrogradsky mode in scalar-tensor theories with higher-order derivative couplings to matter

Ryo Saito

The 32nd Workshop on General Relativity and Gravitation in Japan, Nov 29, 2023
Identifying the inflationary GW background in other stochastic signals

齊藤遼

「超精密かつ多スケール・多粒子観測時代における相対論的宇宙論の確立と宇宙像の探求」第1回ワークショップ, Jun 26, 2023 Invited
宇宙マイクロ波背景放射異方性の精密計算：非線形効果に対する統一的アプローチ

齊藤遼

慶應義塾大学 High Energy Physics Groupセミナー, Jun 7, 2023 Invited
Ostrogradsky mode in scalar-tensor theories with higher-order derivative couplings to matter

Mar 23, 2023
Antipodal angular correlations of inflationary gravitational-wave background

Non-linear Nature of Cosmological Perturbations and its Observational Consequences, Mar 24, 2023 Invited
Antipodal angular correlations of inflationary gravitational-wave background

Workshop on "Fundamental Cosmology: from Beginning to End", Mar 5, 2023 Invited
Angular Correlations of the Inflationary Stochastic Gravitational-wave Background

Workshop on Gravitation & Cosmology, Nov 28, 2022 Invited
Angular correlations of the inflationary stochastic gravitational-wave background

ZhenYuan Wu, Nobuyuki Sakai, Ryo Saito

The 31st Workshop on General Relativity and Gravitation in Japan, Oct 27, 2022
Unified approach to cosmic microwave background anisotropies beyond linear order

齊藤遼

九州大学宇宙物理理論研究室セミナー, Apr 22, 2022 Invited
宇宙マイクロ波背景放射異方性の精密計算：非線形効果に対する統一的アプローチ

齊藤遼

Upcoming CMB observations and Cosmology, Mar 22, 2022 Invited
Angular correlations of the inflationary stochastic gravitational wave background in the perturbed universe

齊藤遼, 呉震遠, 坂井伸之

日本物理学会第77回年次大会, Mar 17, 2022
Antipodal correlations of the inflationary primordial gravitational waves

呉震遠, 坂井伸之, 齊藤遼

日本物理学会第77回年次大会, Mar 17, 2022
Angular correlations of the inflationary stochastic gravitational wave background

Ryo Saito

Dawn of Gravitational-wave Cosmology and Theory of Gravity, Mar 3, 2022 Invited
Antipodal correlation of the inflationary primordial gravitational waves

ZhenYuan WU, Nobuyuki Sakai, Ryo Saito

The 30th Workshop on General Relativity and Gravitation in Japan, Dec 6, 2021
宇宙マイクロ波背景放射異方性の精密計算法の開発: 非線形効果に対する統一的アプローチ

齊藤遼

応用物理・物理系学会中国四国支部合同学術講演会, Jul 31, 2021
CMB Bモード偏光への非線形効果に対する統一的アプローチ

齊藤遼

日本物理学会第76回年次大会, Mar 14, 2021
宇宙マイクロ波背景放射への非線形効果、特に弱重力レンズ効果に対する新たなアプローチ

齊藤遼

立教大学理論物理学コロキウム, Jan 21, 2020 Invited
Cosmic microwave background anisotropies beyond linear order: curve-of-sight approach

Saito Ryo

6th Korea-Japan workshop on dark energy at KMI, Dec 5, 2019 Invited
“Unified Models of Inflation and Dark Energy in f(R) Gravity: constraints from solar system experiments

Mai Yashiki, Nobuyuki Sakai, Ryo Saito

6th Korea-Japan workshop on dark energy at KMI, Dec 4, 2019
“Unified Models of Inflation and Dark Energy in f(R) Gravity: constraints from solar system experiments

Mai Yashiki, Nobuyuki Sakai, Ryo Saito

JGRG29, Nov 27, 2019

Teaching Experience

Apr, 2024 - Present

統計力学III
Oct, 2023 - Present

Quantum Mechanics III (Yamaguchi University)
Apr, 2023 - Present

Logical Thinking (Yamaguchi University)
Oct, 2018 - Present

宇宙論特論 (山口大学)
Apr, 2017 - Present

統計力学演習 (山口大学)
Apr, 2017 - Present

量子力学演習 (山口大学)
Apr, 2016 - Mar, 2017

基礎数学 (摂南大学)

Professional Memberships

Research Projects

超精密かつ多スケール・多粒子観測時代における相対論的宇宙論の確立と宇宙像の探求

科学研究費助成事業, 基盤研究(B), 日本学術振興会, Apr, 2023 - Mar, 2027

成子篤, 齊藤遼, 難波亮, 山内大介
Dark Matter in Quantum Gravity

Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A), Grant-in-Aid for Transformative Research Areas (A), Japan Society for the Promotion of Science, Nov, 2020 - Mar, 2025
Next-generation relativistic cosmology in the era of precision observations

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2022

Naruko Atsushi
Tests of gravity through the fifth force

Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2022

Saito Ryo
宇宙進化に対する小スケール揺らぎの影響とその観測的検証

特別研究員奨励費, 日本学術振興会, Apr, 2011 - Mar, 2014

齊藤遼
重力波を用いた原始ブラックホールの新しい検証方法の研究

特別研究員奨励費, 日本学術振興会, Apr, 2009 - Mar, 2011

齊藤遼

Social Activities

山口高校の探求活動サポート

Consultant

山口高校, Jul 8, 2022 - Mar 31, 2023
山口高校の探求活動サポート

Consultant

山口高校, Aug 21, 2020 - Mar 5, 2021
現代科学が解き明かす宇宙のすがた

Lecturer

岩国高校, Oct, 2019
現代科学が解き明かす宇宙のすがた

Lecturer

防府高校, Nov, 2017
現代科学が解き明かす宇宙のすがた - 宇宙のはじまりと進化 -

Lecturer

萩高校サテライトセミナー, Jun, 2017

Profile Information

Research Interests

Research Areas

Research History

Education

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Misc.

Books and Other Publications

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