Searching for gravitational wave backgrounds with LCGT

• Project/Area Number: 24540269
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyoto University
• Principal Investigator: Seto Naoki 京都大学, 理学(系)研究科(研究院), 助教 (80462191)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 重力波 / 連星 / 三体系 / 宇宙論 / 一般相対論

Outline of Final Research Achievements

As for gravitational wave backgrounds, I studied 1) the information that can be extracted from inflation background and 2) possibility of detecting line-like gravitational wave background by the correlation analysis. I also examined astrophysical systems (e.g. binaries) that emit gravitational waves. In particular, I studied hierarchical triple systems.

Research Products

• [Journal Article] Prospects of eLISA for Detecting Galactic Binary Black Holes Similar to GW150914 (2016)
  • Author(s): N. Seto
  • Journal Title: MNRAS in press Volume: - Issue: 1 Pages: 1-1
  • DOI: 10.1093/mnrasl/slw060
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Search for an emission line of a gravitational wave background (2015)
  • Author(s): Atsushi Nishizawa and Naoki Seto
  • Journal Title: PRD Volume: 91 Issue: 12 Pages: 122001-122001
  • DOI: 10.1103/physrevd.91.122001
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Probability distribution function for inclinations of merging compact binaries detected by gravitational wave interferometers (2015)
  • Author(s): N. Seto
  • Journal Title: MNRAS Volume: 446 Pages: 2887-2994
  • Peer Reviewed
• [Journal Article] Pre-merger localization of eccentric compact binary coalescences with second-generation gravitational-wave detector networks (2014)
  • Author(s): K. Kyutoku, N. Seto
  • Journal Title: MNRAS Volume: 441 Pages: 1934-1942
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Highly Eccentric Kozai Mechanism and Gravitational-Wave Observation for Neutron-Star Binaries (2013)
  • Author(s): N. Seto
  • Journal Title: Phys. Rev. Lett Volume: 111 Issue: 6 Pages: 1106-1106
  • DOI: 10.1103/physrevlett.111.061106
  • Peer Reviewed
• [Journal Article] Analyses on a relativistic hierarchical resonance with the Hamiltonian approach (2013)
  • Author(s): N. Seto
  • Journal Title: MNRAS Volume: 430 Issue: 1 Pages: 558-570
  • DOI: 10.1093/mnras/sts656
  • Peer Reviewed
• [Journal Article] Geometrical aspects of parameter estimation of a stochastic gravitational wave background: Beyond the Fisher analysis (2012)
  • Author(s): N. Seto and K. Kyutoku
  • Journal Title: PRD Volume: 80 Issue: 4 Pages: 42002-42002
  • DOI: 10.1103/physrevd.86.042002
  • Peer Reviewed
• [Journal Article] Enhanced exploration for primordial black holes using pulsar timing arrays (2012)
  • Author(s): Kazumi kashiyama and Naoki Seto
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 426 Issue: 2 Pages: 1369-1373
  • DOI: 10.1111/j.1365-2966.2012.21935.x
  • Peer Reviewed
• [Presentation] スペース重力波アンテナDECIGO計画（69)：DECIGOのサイエンス (2016)
  • Author(s): 瀬戸直樹 DECIGOワーキンググループ
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学(仙台市)
  • Year and Date: 2016-03-21
• [Presentation] スペース重力波アンテナDECIGO計画（60)：DECIGOのサイエンス (2015)
  • Author(s): 瀬戸直樹他 DECIGOワーキンググループ
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-03-23
• [Presentation] DECIGO計画(50): DECIGOのサイエンス (2014)
  • Author(s): 瀬戸直樹 ＤＥＣＩＧＯワーキンググループ
  • Organizer: 日本物理学会
  • Place of Presentation: 東海大学（平塚市）
• [Presentation] スペース重力波アンテナDECIGO計画(39)：サイエンス (2012)
  • Author(s): 瀬戸直樹 他
  • Organizer: 日本物理学会
  • Place of Presentation: 京都産業大