• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Studies on the quantum gravity effects in the early universe and black holes via string field theory and D-branes

Research Project

Project/Area Number 21740198
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionGunma National College of Technology

Principal Investigator

KOBAYASHI Shinpei  群馬工業高等専門学校, 一般教科(自然科学), 准教授 (70513901)

Project Period (FY) 2009 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords宇宙物理 / 素粒子論 / 量子重力 / 非可換幾何学 / 超弦理論 / 弦理論
Research Abstract

We investigated a three-dimensional gravitational theory on a noncommutative space which has a cosmological constant term only as a model which includes quantum gravity effects. We obtained various solutions that correspond to bubbles of spacetimes or interpolates zero metric and Minkowski metric and so on. All solutions we obtained are non-perturbative in the noncommutative parameter, therefore they are thought to be closely related to quantum gravity.We also investigated the fuzzy disc, which is a disc-shaped region in a noncommutative plane. We showed that one can introduce a concept of angles to the fuzzy disc, by using the phase operator and phase states known in quantum optics. As an application, we constructed fan-shaped soliton solutions of a scalar field theory on a fuzzy disc, which might correspond to a fan-shaped D-brane. We also applied this concept to an experimental test of noncommutativity by laser physics.

Report

(5 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (18 results)

All 2013 2012 2011 2010 2009 Other

All Journal Article (7 results) (of which Peer Reviewed: 4 results) Presentation (11 results) (of which Invited: 1 results)

  • [Journal Article] Angles in FuzzyDisc and Angular Noncommutative Solitons2013

    • Author(s)
      小林晋平, 浅川嗣彦
    • Journal Title

      Journal of High Energy Physics

      Volume: 04 Pages: 22-22

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Angles in Fuzzy Disc and Angular Noncommutative Solitons2013

    • Author(s)
      Shinpei Kobayashi, Tsuguhiko Asakawa
    • Journal Title

      Journal of HIgh Energy Physics

      Volume: 未定

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fuzzy Objects in Noncommutative Geometry and Their Applications2013

    • Author(s)
      Shinpei Kobayashi, Tsuguhiko Asakawa
    • Journal Title

      Proceedings of the 22th Workshop on General Relativity and Gravitation

      Volume: 1

    • Related Report
      2012 Annual Research Report
  • [Journal Article] Fuzzy Objects and Noncommutative Solitons2013

    • Author(s)
      Shinpei Kobayashi, Tsuguhiko Asakawa
    • Journal Title

      Proceedings of the 13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity

      Volume: 1

    • Related Report
      2012 Annual Research Report
  • [Journal Article] Noncommutative Solitons of Gravity2010

    • Author(s)
      浅川嗣彦, 小林晋平
    • Journal Title

      Classical and Quantum Gravity

      Volume: 第27巻 Pages: 105014-105014

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Noncommutative Solitons of Gravity2010

    • Author(s)
      浅川嗣彦、小林晋平
    • Journal Title

      Classical and Quantum Gravity VOL.27

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Emergence of Spacetimes and Noncommutativity2010

    • Author(s)
      小林晋平、浅川嗣彦
    • Journal Title

      Proceedings of the nineteenth workshop on General Relativity and Gravitation in Japan

      Pages: 185-188

    • Related Report
      2009 Annual Research Report
  • [Presentation] Fuzzy Objects in Noncommutative Gravity and Their Applications2012

    • Author(s)
      小林晋平
    • Organizer
      JGRG22
    • Place of Presentation
      University of Tokyo
    • Year and Date
      2012-11-12
    • Related Report
      2012 Final Research Report
  • [Presentation] Fuzzy Disc andNoncommutative Solitons2012

    • Author(s)
      小林晋平, 浅川嗣 彦
    • Organizer
      日本物理学会 2012 年秋季大会
    • Place of Presentation
      京都産業大学
    • Year and Date
      2012-09-12
    • Related Report
      2012 Final Research Report
  • [Presentation] Angles in Fuzzy Disc and Angular Noncommutative Solitons2012

    • Author(s)
      小林晋平, 浅川嗣彦
    • Organizer
      離散的手法による場と時空のダイ ナミクス研究会(招待講演)
    • Year and Date
      2012-08-30
    • Related Report
      2012 Final Research Report
  • [Presentation] Fuzzy Objects and Noncommutative Solitons2012

    • Author(s)
      小林晋平, 浅川嗣彦
    • Organizer
      The 13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Stockholm University
    • Place of Presentation
      Sweden
    • Year and Date
      2012-06-05
    • Related Report
      2012 Final Research Report
  • [Presentation] Noncommutative Solitons and Phase Operator2012

    • Author(s)
      小林晋平
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西学院大学西宮上ヶ原キャンパス
    • Year and Date
      2012-03-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] 非可換空間上の重力理論におけるソリトン解について2011

    • Author(s)
      小林晋平
    • Organizer
      KEK THEORY2011
    • Place of Presentation
      (震災のため以下のwebページのみでの発表http://resesrch.kek.jp/group/riron/workshop/theory2011/poster2011.html)
    • Year and Date
      2011-03-15
    • Related Report
      2010 Annual Research Report
  • [Presentation] Emergence of Spacetimes and Noncommutativity2009

    • Author(s)
      小林晋平、浅川嗣彦
    • Organizer
      The 19^<th> workshop on General Relativity and Gravitation in Japan
    • Place of Presentation
      立教大学池袋キャンパス
    • Year and Date
      2009-11-30
    • Related Report
      2009 Annual Research Report
  • [Presentation] Fuzzy Objects and Noncommutative Solitons

    • Author(s)
      Shinpei Kobayashi
    • Organizer
      The 13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity
    • Place of Presentation
      Stockholm University, Stickholem, Sweden
    • Related Report
      2012 Annual Research Report
  • [Presentation] Fuzzy Disc and Noncommutative Solitons

    • Author(s)
      小林晋平
    • Organizer
      日本物理学会2012年度秋季大会
    • Place of Presentation
      京都産業大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] Angles in Fuzzy Disc and Angular Noncommutative Solitons

    • Author(s)
      小林晋平
    • Organizer
      「離散的手法による場と時空のダイナミクス」研究会
    • Place of Presentation
      理化学研究所(和光)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Fuzzy Objects in Noncommutative Geometry and Their Applications

    • Author(s)
      Shinpei Kobayashi
    • Organizer
      JGRG22 (RESCEU Symposium on General Relativity and Graviation)
    • Place of Presentation
      Koshiba Hall, The University of Tokyo, Tokyo, JAPAN
    • Related Report
      2012 Annual Research Report

URL: 

Published: 2009-04-01   Modified: 2019-07-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi