Nonperturbative aspects of string field theory

• Project/Area Number: 24340051
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nara Women's University
• Principal Investigator: TAKAHASHI Tomohiko 奈良女子大学, 自然科学系, 准教授 (10324956)
• Co-Investigator(Kenkyū-buntansha): KISHIMOTO Isao 新潟大学, 人文社会・教育科学系, 准教授 (60399433)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000); Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2013: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
• Keywords: 弦理論 / 弦の場の理論 / Dブレーン / タキオン凝縮 / 単位弦場 / 素粒子論 / ゲージ対称性 / 古典解

Outline of Final Research Achievements

We exactly calculate vacuum energy and gauge invariant overlaps of identity-based tachyon vacuum solutions and identity-based marginal solutions in open string field theory. First, by numerical analysis of the theory expanded around the identity-based solutions, we expect the values of the physical quantities for them. Next, we consider a modified KBc algebra in the theory on this background.　By use of the algebra, classical solutions on the background are constructed and observables for them, including energy densities and gauge invariant overlaps, are calculable. Finally, these results are applied to evaluate observables analytically for the identity-based solutions.

Research Products

• [Journal Article] Open String Fields as Matrices (2015)
  • Author(s): Isao Kishimoto, Toru Masuda, Tomohiko Takahashi, Shoko Takemoto
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 033B05 Issue: 3 Pages: 1-8
  • DOI: 10.1093/ptep/ptv023
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Comments on observables for identity-based marginal solutions in Berkovits’ superstring field theory (2014)
  • Author(s): Isao Kishimoto, Tomohiko Takahashi
  • Journal Title: Journal of High Energy Physics Volume: 07 Issue: 7 Pages: 031-031
  • DOI: 10.1007/jhep07(2014)031
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Observables for identity-based tachyon vacuum solutions (2014)
  • Author(s): Isao Kishimoto, Toru Masuda, Tomohiko Takahashi
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 103B02 Issue: 10 Pages: 1-15
  • DOI: 10.1093/ptep/ptu136
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Numerical Solutions of Open String Field Theory in Marginally Deformed Backgrounds (2013)
  • Author(s): Isao Kishimoto, Tomohiko Takahashi
  • Journal Title: Progress of Theor. Exp. Phys. Volume: 093B06 Issue: 9 Pages: 1-21
  • DOI: 10.1093/ptep/ptt072
  • Peer Reviewed
• [Journal Article] Gauge invariant overlaps for identity-based marginal solutions (2013)
  • Author(s): Isao Kishimoto, Tomohiko Takahashi
  • Journal Title: Progress of Theor. Exp. Phys. Volume: 093B07 Issue: 9 Pages: 1-9
  • DOI: 10.1093/ptep/ptt073
  • Peer Reviewed
• [Journal Article] Tachyon vacuum of bosonic open string field theory in marginally deformed backgrounds (2013)
  • Author(s): S. Inatomi, I. Kishimoto, T. Takahashi
  • Journal Title: Progress of Theoretical and Experimantal Physics Volume: Vol.2013,No.2 Issue: 2 Pages: 23B02-0
  • DOI: 10.1093/ptep/pts070
  • Peer Reviewed
• [Journal Article] On nontrivial solutions around a marginal solutions in cubic superstring field theory (2012)
  • Author(s): S. Inatomi, I. Kishimoto, T. Takahashi
  • Journal Title: Journal of High Energy Physics Volume: 12 Issue: 12 Pages: 73-73
  • DOI: 10.1007/jhep12(2012)071
  • Peer Reviewed
• [Presentation] 多重ブレーン解とChan-Paton因子について (2015)
  • Author(s): 岸本功、増田暢、高橋智彦、竹本祥子
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学早稲田キャンパス
  • Year and Date: 2015-03-23
• [Presentation] 単位弦場に基づくタキオン真空解の物理量 (2014)
  • Author(s): 岸本功、高橋智彦、増田暢
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 佐賀大学本庄キャンパス
  • Year and Date: 2014-09-18
• [Presentation] Observables for identity-based tachyon vacuum solutions (2014)
  • Author(s): Tomohiko Takahashi
  • Organizer: String Field Theory and Related Aspects VI
  • Place of Presentation: SISSA, Trieste, Italy
  • Year and Date: 2014-08-01
  • Invited
• [Presentation] 単位弦場に基づくマージナル変形解周りの弦の場の理論の数値解 (2013)
  • Author(s): 岸本功、高橋智彦
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学東広島キャンパス
  • Year and Date: 2013-03-27
• [Presentation] マージナル変形された背景上の超弦の場の理論における古典解について (2013)
  • Author(s): 稲冨晶子、岸本功、高橋智彦
  • Organizer: 日本物理学会第68回秋季大会
  • Place of Presentation: 広島大学東広島キャンパス
  • Year and Date: 2013-03-27
• [Presentation] Tachyon Vacuum in Marginally Deformed Backgrounds (2012)
  • Author(s): Tomohiko Takahashi
  • Organizer: String Field Theory and Related Aspects (SFT2012)
  • Place of Presentation: the Israel Institute for Advanced Studies, Jerusalem, Israel
  • Year and Date: 2012-10-08
• [Presentation] Nontrivial Solutions around Identity-Based Marginal Solutions in Cubic Superstring Field Theory (2012)
  • Author(s): Isao Kishimoto
  • Organizer: String Field Theory and Related Aspects (SFT2012)
  • Place of Presentation: the Israel Institute for Advanced Studies, Jerusalem, Israel
  • Year and Date: 2012-10-08
• [Presentation] マージナル変形された背景上のタキオン真空解 (2012)
  • Author(s): 稲冨晶子、岸本功、高橋智彦
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 京都産業大学
  • Year and Date: 2012-09-12
• [Presentation] マージナル変形された背景上でのオーバラップの解析
  • Author(s): 岸本 功、高橋 智彦
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 高知大学朝倉キャンパス
• [Presentation] 単位超弦場に基づくマージナル変形解のオーバラップ
  • Author(s): 岸本 功、高橋 智彦
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
• [Remarks]
  • URL: http://asuka.phys.nara-wu.ac.jp/