Education and Positions

• Senior Visiting Scientist, Kavli IPMU, The University of Tokyo, Japan (2021~present)
• Research Fellow, ASIAA (2021~present)
• Associate Research Fellow, ASIAA (2017~2021)
• Visiting Scientist, Kavli IPMU, The University of Tokyo, Japan (2017~2021)
• Project Researcher, Kavli IPMU, The University of Tokyo, Japan (2014~2016)
• Postdoctoral Fellow, Institute for the Early Universe, Ewha Womans University, Korea (2009~2013)
• Postdoctoral Fellow, Shanghai Astronomical Observatory, China (2008~2009)
• Doctor in Physics, Nagoya University, Japan (2005~2008)
• Master in Physics, Nagoya University, Japan (2003~2005)
• Bachelor in Physics, Kwansei Gakuin University, Japan (1999~2003)

Honors & Awards

• Career Development Award, Academia Sinica (2019~2023)
• The PASJ Excellent Paper Award, The Astronomical Society of Japan (Okumura et al. 2016, PASJ, 68, 38) (2018)
• PRD Editor's Suggestion, American Physical Society (Saito et al. 2014, PRD, 90, 123522) (2014)

Committees Served

• Chair, Computing Committee, ASIAA (2020~2022)

Research Interests

Observational cosmology, Large-scale structure of the Universe, Analysis of large data set and simulations, Galaxy redshift surveys, Gravitational lensing, Dark matter and Dark energy, Modified gravity theory

Publications

Complete List of Publications

My Publications from ADS

Journal Papers affiliated with ASIAA

1. Chaurasiya N; More S; Ishikawa S; Masaki S; Kashino D; Okumura T, "Galaxy-dark matter connection of photometric galaxies from the HSC-SSP Survey: Galaxy-galaxy lensing and the halo model" , MNRAS: 527(3), 5265-5292, Jan, 2024 [SCI] ( ADS | Fulltext )
2. Ishikawa S; Okumura T; Nishimichi T, "MOCK OBSERVATORY: Two thousand light-cone mock catalogues of luminous red galaxies from the Hyper Suprime-Cam Survey for the cosmological large-scale analysis" , MNRAS: 529(2), 1839-1851, Apr, 2024 [SCI] ( ADS | Fulltext )
3. Saga S; Shiraishi M; Akitsu K; Okumura T, "Imprints of primordial magnetic fields on intrinsic alignments of galaxies" , Phys Rev D: 109(4), id.43520, Feb, 2024 [SCI] ( ADS | Fulltext )
4. Akitsu K; Li Y; Okumura T, "Gravitational wave fossils in nonlinear regime: Halo tidal bias and intrinsic alignments from gravitational wave separate universe simulations" , Phys Rev D: 107(6), id.63531, March, 2023 [SCI] ( ADS | Fulltext )
5. Akitsu K; Li Y; Okumura T, "Quadratic shape biases in three-dimensional halo intrinsic alignments" , JCAP: 2023(8), id.068 (21 pp), Aug, 2023 [SCI] ( ADS | Fulltext )
6. Okumura T; Taruya A, "First Constraints on Growth Rate from Redshift-space Ellipticity Correlations of SDSS Galaxies at 0.16 < z < 0.70" , ApJL: 945(2), L30 (7pp), March, 2023 [SCI] ( ADS | Fulltext )
7. Osato K; Okumura T, "Clustering of emission line galaxies with IllustrisTNG I.: Fundamental properties and halo occupation distribution" , MNRAS: 519(2), 1771-1791, Feb, 2023 [SCI] ( ADS | Fulltext )
8. Saga S; Okumura T; Taruya A; Inoue T, "Relativistic distortions in galaxy density-ellipticity correlations: gravitational redshift and peculiar velocity effects" , MNRAS: 518(4), 4976-4990, Feb, 2023 [SCI] ( ADS | Fulltext )
9. Shiraishi M; Okumura T; Akitsu K, "Statistical anisotropy in galaxy ellipticity correlations" , JCAP: 2023(8), id.13 (27pp), Aug, 2023 [SCI] ( ADS | Fulltext )
10. Chuang Y-T; Okumura T; Shirasaki M, "Distinguishing between ΛCDM and f(R) gravity models using halo ellipticity correlations in simulations" , MNRAS: 515(3), 4464-4470, Sep, 2022 [SCI] ( ADS | Fulltext )
11. Okumura T; Taruya A, "Tightening geometric and dynamical constraints on dark energy and gravity: Galaxy clustering, intrinsic alignment, and kinetic Sunyaev-Zel'dovich effect" , Phys Rev D: 106(4), id.43523, Aug, 2022 [SCI] ( ADS | Fulltext )
12. Tonegawa M; Okumura T, "First Evidence of Intrinsic Alignments of Red Galaxies at z > 1: Cross Correlation between CFHTLenS and FastSound Samples" , ApJL: 924(1), id.L3 (7pp), Jan, 2022 [SCI] ( ADS | Fulltext )
13. Akitsu K; Li Y; Okumura T, "Cosmological simulation in tides: power spectra, halo shape responses, and shape assembly bias" , JCAP: 2021(04), id.41 (35pp), Apr, 2021 [SCI] ( ADS | Fulltext )
14. Ishikawa S; Okumura T; Oguri M; Lin S-C, "Halo-model Analysis of the Clustering of Photometric Luminous Red Galaxies at 0.10 ≤ z ≤1.05 from the Subaru Hyper Suprime-Cam Survey" , ApJ: 922(1), id.23 (13pp), Nov, 2021 [SCI] ( ADS | Fulltext )
15. Okumura T; Hayashi M; Chiu I-N; Lin Y-T; Osato K; Hsieh B-C; Lin S-C, "Angular clustering and host halo properties of [OII] emitters at z>1 in the Subaru HSC survey" , PASJ: 73(4), 1186-1207, Aug, 2021 [SCI] ( ADS | Fulltext )
16. Shiraishi M; Akitsu K; Okumura T, "Alcock-Paczynski effects on wide-angle galaxy statistics" , Phys Rev D: 103(1), id.123534, Jun, 2021 [SCI] ( ADS | Fulltext )
17. Shiraishi M; Okumura T; Akitsu K, "Minimum variance estimation of statistical anisotropy via galaxy survey" , JCAP: 2021(03), id.39 (20pp), Mar, 2021 [SCI] ( ADS | Fulltext )
18. Shiraishi M; Taruya A; Okumura T; Akitsu K, "Wide-angle effects on galaxy ellipticity correlations" , MNRAS: 503(1), L6–L10, May, 2021 [SCI] ( ADS | Fulltext )
19. Agrawal A; Okumura T; Futamase T, "Standard candles and sirens rescue H0" , ApJ: 904(2), id.169 (6pp), Dec, 2020 [SCI] ( ADS | Fulltext )
20. Chiu I-N; Okumura T; Oguri M; Agrawal A, ...; Umetsu K; Lin Y-T, "A clustering-based self-calibration of the richness-to-mass relation of CAMIRA galaxy clusters out to z ≍ 1.1 in the Hyper Suprime-Cam survey" , MNRAS: 498(2), 2030-2053, Oct, 2020 [SCI] ( ADS | Fulltext )
21. Matsumoto J; Okumura T; Sasaki M, "New measures to test modified gravity cosmologies" , JCAP: 07, id. 059 (16pp.), Jul, 2020 [SCI] ( ADS | Fulltext )
22. Okumura T; Taruya A, "Anisotropies of galaxy ellipticity correlations in real and redshift space: Angular dependence in linear tidal alignment model" , MNRAS: 493(1), L124-128 (5 pp.), Mar, 2020 [SCI] ( ADS | Fulltext )
23. Okumura T; Taruya A; Nishimichi T, "Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations" , MNRAS: 494(1), 694-702 (9pp.), May, 2020 [SCI] ( ADS | Fulltext )
24. Shiraishi M; Okumura T; Sugiyama NS; et al., "Minimum Variance Estimation of Galaxy Power Spectrum in Redshift Space" , MNRAS: 498(1), L77-L81, Oct, 2020 [SCI] ( ADS | Fulltext )
25. Taruya A; Okumura T, "Improving geometric and dynamical constraints on cosmology with intrinsic alignments of galaxies" , ApJL: 891(2), id.L42 (6pp.), Mar, 2020 [SCI] ( ADS | Fulltext )
26. Agrawal A; Okumura T; Futamase T, "Constraining neutrino mass and dark energy with peculiar velocities and lensing dispersions of Type Ia supernovae" , Phys Rev D: 100(6), id. 063534 (8 pp.), Sep, 2019 [SCI] ( ADS | Fulltext )
27. Okumura T; Taruya A; Nishimichi T, "Intrinsic alignment statistics of density and velocity fields at large scales: Formulation, modeling, and baryon acoustic oscillation features" , Phys Rev D: 100(10), id. 103507 (22 pp.), Nov, 2019 [SCI] ( ADS | Fulltext )
28. Arroja F; Okumura T; Bartolo N; et al., "Large-scale structure in mimetic Horndeski gravity" , JCAP: 05, id. 050, May, 2018 [SCI] ( ADS | Fulltext )
29. Okumura T; Nishimichi T; Umetsu K; et al., "Splashback radius of nonspherical dark matter halos from cosmic density and velocity fields" , Phys Rev D: 98(2), id. 023523 (18 pp.), July, 2018 [SCI] ( ADS | Fulltext )
30. Osato K; Nishimichi T; Oguri M; Takada M; Okumura T, "Strong orientation dependence of surface mass density profiles of dark haloes at large scales" , MNRAS: 477(2), 2141-2153, June, 2018 [SCI] ( ADS | Fulltext )
31. Sugiyama NS; Okumura T; Spergel DN, "A direct measure of free electron gas via the Kinematic Sunyaev-Zel'dovich effect in Fourier-space analysis" , MNRAS: 475(3), 3764-3785, April, 2018 [SCI] ( ADS | Fulltext )
32. Sugiyama NS; Shiraishi M; Okumura T, "Limits on statistical anisotropy from BOSS DR12 galaxies using bipolar spherical harmonics" , MNRAS: 473(2), 2737-2752, Jan, 2018 [SCI] ( ADS | Fulltext )
33. Suyu SH; Chang T-C; Courbin F; Okumura T, "Cosmological distance indicators" , Space Sci Rev: 214(5), id. 91 (34 pp.), Aug, 2018 [SCI] ( ADS | Fulltext )
34. Tonegawa M; Okumura T; Totani T; et al., "The Subaru FMOS galaxy redshift survey (FastSound). V. Intrinsic alignments of emission line galaxies at z ~ 1.4" , PASJ: 70(3), 41, June, 2018 [SCI] ( ADS | Fulltext )
35. Umetsu K; Sereno M; Tam S-L; Chiu I-N; ...; Okumura T; ...; Higuchi Y; et al., "The Projected Dark and Baryonic Ellipsoidal Structure of 20 CLASH Galaxy Clusters" , ApJ: 806(2), id. 104 (26 pp.), June, 2018 [SCI] ( ADS | Fulltext )
36. Okumura T; Takada M; More S; et al., "Reconstruction of halo power spectrum from redshift-space galaxy distribution: cylinder-grouping method and halo exclusion effect" , MNRAS: 469(1), 459-475, July, 2017 [SCI] ( ADS | Fulltext )
37. Shiraishi M; Sugiyama NS; Okumura T, "Polypolar spherical harmonic decomposition of galaxy correlators in redshift space: Toward testing cosmic rotational symmetry" , Phys Rev D: 95(6), 063508, March, 2017 [SCI] ( ADS | Fulltext )
38. Sugiyama NS; Okumura T; Spergel DN, "Will kinematic Sunyaev-Zel'dovich measurements enhance the science return from galaxy redshift surveys?" , JCAP: 01, 057, Jan, 2017 [SCI] ( ADS | Fulltext )
39. Okumura T; Hikage C; Totani T; et al., "The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z ˜ 1.4" , PASJ: 68(3), id.38 (24 pp), June, 2016 [SCI] ( ADS | Fulltext )
40. Tonegawa M; Okumura T; Totani T; et al., "The Subaru FMOS galaxy redshift survey (FastSound). V. Intrinsic alignments of emission line galaxies at z ~ 1.4" , PASJ: 68(3), id.38 (24 pp. ), June, 2016 [SCI] ( ADS | Fulltext )
41. Okumura T; Seljak U; Desjacques V, "Distribution function approach to redshift space distortions. Part III: halos and galaxies" , JCAP: Issue 11, id. 014, Nov, 2012 [SCI] ( ADS | Fulltext )
42. Okumura T; Jing YP; Li Cheng, "Intrinsic Ellipticity Correlation of SDSS Luminous Red Galaxies and Misalignment with Their Host Dark Matter Halos" , ApJ: 694(1), 214-221, March, 2009 [SCI] ( ADS | Fulltext )
43. Okumura T; Matsubara T; Eisenstein DJ; et al., "Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies" , ApJ: 676(2), 889-898, April, 2008 [SCI] ( ADS | Fulltext )