Okumura, Teppei 奥村哲平

Research Fellow

photo of Okumura, Teppei
PDF version of CV
Office: ASMAB 1214
Email: tokumura _replace_to_@_ asiaa.sinica.edu.tw
pubLON 3990914/teppei-okumura/
ORCID 0000-0002-8942-9772
ADS My Publications from ADS
Complete List of Publications

Research Interests

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

Positions

Education

Honors & Awards

Committees Served

Journal Papers affiliated with ASIAA(59)

  1. Osato K; Okumura T, "Clustering of emission line galaxies with IllustrisTNG ─ II. Cosmology challenge with anisotropic correlation functions and ELG─halo connections", MNRAS: 551(1), id.stag1439 (16 pp), Sep, 2026 [SCI] ( ADS | Fulltext )
  2. Minato K; Taruya A; Okumura T; Shiraishi M, "Probing dipolar power asymmetry with galaxy clustering and intrinsic alignments", Phys Rev D: 114(4), id.043534 (16 pp), Aug, 2026 [SCI] ( ADS | Fulltext )
  3. Mikura Y; Okumura T; Sasaki M, "Imprints of gravitational-wave polarizations on projected tidal tensor in three dimensions", JCAP: 2026(4), id.061 (29 pp), Apr, 2026 [SCI] ( ADS | Fulltext )
  4. Moon J-S; Okumura T, "Galaxy Spin Alignment with Tidal Fields in the SDSS-IV MaNGA Survey", ApJ: 995(1), id.L8 (11 pp), Dec, 2025 [SCI]
  5. Roy Choudhury S; Okumura T; Umetsu K, "Cosmological Constraints on Nonphantom Dynamical Dark Energy with DESI Data Release 2 Baryon Acoustic Oscillations: A 3σ+ Lensing Anomaly", ApJL: 994(1), id. L26, Nov, 2025 [SCI]
  6. Okumura T, "Evidence for Intrinsic Galaxy Alignments in Ellipticity Autocorrelations Out to 100 h‑1 Mpc from SDSS Galaxies with DESI Imaging", ApJ: 990(1), id.L19 (7 pp), Sep, 2025 [SCI]
  7. Shim J; Pen U-L; Yu H-R; Okumura T, "Probing vector chirality in the early Universe", Phys Rev Lett: 135(14), 141002, Sep, 2025 [SCI]
  8. Pu S-Y; Okumura T; Chen C-C; Nishimichi T; Akitsu K, "Constraining cosmology with N-body simulations for future spectroscopic galaxy surveys at 2≤z≤3", Phys Rev D: 112(4), id.L041302 (8 pp), Aug, 2025 [SCI]
  9. Shim J; Okumura T; Taruya A, "Improving cosmological constraints via galaxy intrinsic alignment in full-shape analysis", Phys Rev D: 111(12), id.123551 (21 pp), Jun, 2025 [SCI]
  10. Ishikawa S; Okumura T; Hayashi M; Takeuchi TT, "A new constraint on galaxy-halo connections of [O II] emitters via HOD modelling with angular clustering and luminosity functions from the Subaru HSC survey", MNRAS: 539(3), pp. 2323-2346 (24 pp), May, 2025 [SCI]
  11. Masaki S; Shiraishi M; Nishimichi T; Okumura T; Yokoyama S, "First confirmation of anisotropic halo bias from statistically anisotropic matter distributions", Phys Rev D: 111(10), id.L101301 (6 pp), May, 2025 [SCI]
  12. Shim J; Okumura T; Taruya A, "Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments", ApJL: 985(1), id.L14 (6 pp), May, 2025 [SCI]
  13. Taruya A; Kurita T; Okumura T, "Improving redshift-space power spectra of halo intrinsic alignments from perturbation theory", Phys Rev D: 111(10), id.103518 (22 pp), May, 2025 [SCI]
  14. Inoue T; Okumura T; Saga S; Taruya A, "Testing local position invariance with odd multipoles of galaxy clustering statistics", Phys Rev D: 111(8), id.L081303 (7 pp), Apr, 2025 [SCI]
  15. Tonegawa M; Okumura T; Hayashi M, "Intrinsic alignments and spin correlations of [O II] emitters at z = 1.2 and z = 1.5 from the HSC narrow-band survey", PASJ: 77(2), id.389 (14pp), Apr, 2025 [SCI]
  16. Inoue T; Okumura T; Saga S; Taruya A, "Information content in anisotropic cosmological fields: Impact of different multipole expansion scheme for galaxy density and ellipticity correlations", Phys Rev D: 111(2), id.023507 (21 pp), Jan, 2025 [SCI]
  17. Roy Choudhury S; Okumura T, "Updated Cosmological Constraints in Extended Parameter Space with Planck PR4, DESI Baryon Acoustic Oscillations, and Supernovae: Dynamical Dark Energy, Neutrino Masses, Lensing Anomaly, and the Hubble Tension", ApJL: 976(1), id. L11 (10pp), Nov, 2024 [SCI]
  18. Okumura T; Sasaki M, "Extracting parity-violating gravitational waves from projected tidal force tensor in three dimensions", JCAP: 2024(10), id.060 (25 pp.), Oct, 2024 [SCI]
  19. Van Kampen E; Bakx T; De Breuck C; Chen C-C; Dannerbauer H; Magnelli B; Montenegro-Montes FM; Okumura T; Pu S-Y; Rybak M; Saintonge A; Cicone C; Hatziminaoglou E; Hilhorst J; Klaassen P; Lee M; Lovell CC; Lundgren A; Di Mascolo L; Mroczkowski T; Sommovigo L; Booth M; Cordiner MA; Ivison R; Johnstone D; Liu D; Maccarone TJ; Smith M; Thelen AE; Wedemeyer S, "Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Surveying the distant Universe", Open Research Europe: 4, 122, June, 2024 [SCI]
  20. Okumura T; Taruya A; Kurita T; Nishimichi T, "Nonlinear redshift space distortion in halo ellipticity correlations: Analytical model and N-body simulations", Phys Rev D: 109(10), id.103501 (26 pp), May, 2024 [SCI]
  21. 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]
  22. 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]
  23. 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]
  24. 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]
  25. Shiraishi M; Okumura T; Akitsu K, "Statistical anisotropy in galaxy ellipticity correlations", JCAP: 2023(8), id.13 (27pp), Aug, 2023 [SCI]
  26. Arai, Shun; Aoki, Katsuki; Chinone, Yuji; Kimura, Rampei; Kobayashi, Tsutomu; Miyatake, Hironao; Yamauchi, Daisuke; Yokoyama, Shuichiro; Akitsu, Kazuyuki; Hiramatsu, Takashi; Hirano, Shin'ichi; Kase, Ryotaro; Katsuragawa, Taishi; Kobayashi, Yosuke; Namikawa, Toshiya; Nishimichi, Takahiro; Okumura, Teppei; Shiraishi, Maresuke; Shirasaki, Masato; Sunayama, Tomomi; Takahashi, Kazufumi; Taruya, Atsushi; Tokuda, Junsei, "Cosmological gravity probes: Connecting recent theoretical developments to forthcoming observations", Progress of Theoretical and Experimental Physics: 2023(7), id.072E01 (105 pp.), July, 2023 [SCI]
  27. 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]
  28. 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]
  29. 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]
  30. 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]
  31. 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]
  32. 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]
  33. 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]
  34. 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]
  35. 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]
  36. Shiraishi M; Akitsu K; Okumura T, "Alcock-Paczynski effects on wide-angle galaxy statistics", Phys Rev D: 103(1), id.123534, Jun, 2021 [SCI]
  37. Shiraishi M; Taruya A; Okumura T; Akitsu K, "Wide-angle effects on galaxy ellipticity correlations", MNRAS: 503(1), L6–L10, May, 2021 [SCI]
  38. 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]
  39. Shiraishi M; Okumura T; Akitsu K, "Minimum variance estimation of statistical anisotropy via galaxy survey", JCAP: 2021(03), id.39 (20pp), Mar, 2021 [SCI]
  40. Agrawal A; Okumura T; Futamase T, "Standard candles and sirens rescue H0", ApJ: 904(2), id.169 (6pp), Dec, 2020 [SCI]
  41. 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]
  42. 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]
  43. Matsumoto J; Okumura T; Sasaki M, "New measures to test modified gravity cosmologies", JCAP: 07, id. 059 (16pp.), Jul, 2020 [SCI]
  44. 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]
  45. 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]
  46. 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]
  47. 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]
  48. 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]
  49. Suyu SH; Chang T-C; Courbin F; Okumura T, "Cosmological distance indicators", Space Sci Rev: 214(5), id. 91 (34 pp.), Aug, 2018 [SCI]
  50. 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]
  51. 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]
  52. 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]
  53. 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]
  54. Arroja F; Okumura T; Bartolo N; et al., "Large-scale structure in mimetic Horndeski gravity", JCAP: 05, id. 050, May, 2018 [SCI]
  55. 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]
  56. 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]
  57. 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]
  58. 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]
  59. 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]