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Exploring the origin of the Universe with nonclassicality of primordial gravitational waves

Research Project

Project/Area Number 19K03827
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKyushu University (2020-2022)
Osaka University (2019)

Principal Investigator

Kanno Sugumi  九州大学, 理学研究院, 准教授 (70827427)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords原始重力波 / グラビトン / エンタングルメント / 量子性 / 量子生 / 重力子 / ノイズ / 量子情報
Outline of Research at the Start

初期宇宙の理論であるインフレーション理論は、宇宙の構造や宇宙背景放射の温度揺らぎを、量子揺らぎから説明することに成功しました。本研究の目的は、初期の宇宙が本当に量子揺らぎから始まったのかを検証する方法を見つけることです。そのために、量子情報理論で発展したハンブリー・ ブラウンとトゥイスの干渉計を宇宙論に応用し、透過性の高い原始重力波の量子性の検証に的を絞ります。さらに、将来の干渉計による検証可能性を調べます。原始重力波の量子性の検証に成功すれば、インフレーション理論の証明を与えるだけでなく、未だに存在が確認されていない重力子の発見にもつながります。

Outline of Final Research Achievements

We considered the possible detection of nonclassicality of primordial gravitational waves (PGWs) by applying Hanbury-Brown and Twiss (HBT) interferometry to cosmology. We characterized the nonclassicality of PGWs in terms of sub-Poissonian statistics that can be measured by the HBT interferometry. We showed that the presence of classical sources during inflation makes it possible to detect nonclassical PGWs with the HBT interferometry. It turned out that PGWs with frequencies higher than 10 kHz enable us to detect their nonclassicality.
As another method to detect the nonclassical PGW, we proposed an experiment that the entanglement between two macroscopic mirrors suspended at the end of an equal-arm interferometer is destroyed by the noise of gravitons through bremsstrahlung. We estimated that the decoherence time induced by the noise of gravitons in squeezed states stemming from inflation is approximately 20 seconds for 40 km long arms and 40 kg mirrors.

Academic Significance and Societal Importance of the Research Achievements

原始重力波の量子性をハンブリー・ブラウンとトゥイス干渉計を用いて、直接的に観測できる振動数領域を予言した。また原始重力波の量子であるグラビトンが、巨視的量子物体に対するノイズになることでデコヒーレンスを起こし、そのデコヒーレンス時間を測定することで、グラビトンを間接的に観測する方法を提案した。これらの観測方法が将来実現できれば、私たちの宇宙の起源が確かに量子揺らぎであったことが明らかになる。原始重力波の量子性の検出に成功すれば、未だに存在が確認されていないグラビトンの発見にもつながり、量子重力理論研究への波及効果が期待できる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (26 results)

All 2023 2022 2021 2020 2019 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results,  Open Access: 11 results) Presentation (13 results) (of which Int'l Joint Research: 8 results,  Invited: 11 results) Remarks (2 results)

  • [Journal Article] Squeezed quantum states of graviton and axion in the universe2022

    • Author(s)
      Sugumi Kanno, Jiro Soda
    • Journal Title

      International Journal of Modern Physics D

      Volume: 31 Issue: 13 Pages: 2250098-2250098

    • DOI

      10.1142/s0218271822500985

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Graviton non-gaussianity in α-vacuum2022

    • Author(s)
      Sugumi Kanno, Misao Sasaki
    • Journal Title

      Journal of High Energy Physics

      Volume: 8 Issue: 8 Pages: 210-210

    • DOI

      10.1007/jhep08(2022)210

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conversion of squeezed gravitons into photons during inflation2022

    • Author(s)
      Sugumi Kanno, Jiro Soda, Kazushige Ueda
    • Journal Title

      Physical Review D

      Volume: 106 Issue: 8 Pages: 83508-83508

    • DOI

      10.1103/physrevd.106.083508

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anisotropic warm inflation2022

    • Author(s)
      Sugumi Kanno, Ann Nakato, Jiro Soda, Kazushige Ueda
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 6 Pages: 63503-63503

    • DOI

      10.1103/physrevd.107.063524

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impact of quantum entanglement induced by magnetic fields on primordial gravitational waves2022

    • Author(s)
      Sugumi Kanno, Ann Nakato, Jiro Soda, Kazushige Ueda
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 6 Pages: 63503-63503

    • DOI

      10.1103/physrevd.107.063503

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Harvesting quantum coherence from axion dark matter2022

    • Author(s)
      Kanno Sugumi、Matsumura Akira、Soda Jiro
    • Journal Title

      Modern Physics Letters A

      Volume: 37 Issue: 05 Pages: 2250028-2250028

    • DOI

      10.1142/s0217732322500286

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Indirect detection of gravitons through quantum entanglement2021

    • Author(s)
      Kanno Sugumi、Soda Jiro、Tokuda Junsei
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 8 Pages: 1-7

    • DOI

      10.1103/physrevd.104.083516

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Noise and decoherence induced by gravitons2021

    • Author(s)
      Kanno Sugumi、Soda Jiro、Tokuda Junsei
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 4 Pages: 044017-044017

    • DOI

      10.1103/physrevd.103.044017

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Polarized Initial States of Primordial Gravitational Waves2020

    • Author(s)
      Kanno Sugumi、Soda Jiro
    • Journal Title

      Symmetry

      Volume: 12 Issue: 4 Pages: 672-672

    • DOI

      10.3390/sym12040672

    • NAID

      120007026369

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detecting nonclassical primordial gravitational waves with Hanbury-Brown--Twiss interferometry2019

    • Author(s)
      Sugumi Kanno, Jiro Soda
    • Journal Title

      Physical Review D

      Volume: 99 Issue: 8 Pages: 0840101-7

    • DOI

      10.1103/physrevd.99.084010

    • NAID

      120006715551

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonclassical primordial gravitational waves from the initial entangled state2019

    • Author(s)
      Sugumi Kanno
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 12 Pages: 12353601-12

    • DOI

      10.1103/physrevd.100.123536

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Graviton nongaussianity in α-vacuum2023

    • Author(s)
      Sugumi Kanno
    • Organizer
      Testing Gravity 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 原始揺らぎの量子性は観測できるか?2023

    • Author(s)
      菅野 優美
    • Organizer
      Kagoshima Workshop on Particles, Fields and Strings 2023
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Exploring the Early Universe with Gravitons2022

    • Author(s)
      Sugumi Kanno
    • Organizer
      1001 Space Nights Online Seminar of ISSIBJ
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] エンタングルメントを用いたグラビトンの間接検出2022

    • Author(s)
      菅野 優美
    • Organizer
      日本物理学会2022年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Graviton nongaussianity in α-vacuum2022

    • Author(s)
      Sugumi Kanno
    • Organizer
      Non-linear aspects of cosmological gravitational waves
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Graviton nongaussianity in α-vacuum2022

    • Author(s)
      Sugumi Kanno
    • Organizer
      9th Korea-Japan Workshop on Dark Energy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Squeezed quantum coherent states of axions2022

    • Author(s)
      Sugumi Kanno
    • Organizer
      Workshop on Very Light Dark Matter 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Indirect detection of gravitons through quantum decoherence2022

    • Author(s)
      Sugumi Kanno
    • Organizer
      KEK IPNS-IMSS-QUP Joint workshop
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The exploration of new areas of cosmology2021

    • Author(s)
      Sugumi Kanno
    • Organizer
      2021 Joint workshop of TYL/FJPPL and FKPPL
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 初期宇宙とグラビトン探索2021

    • Author(s)
      菅野 優美
    • Organizer
      素粒子物理学の進展
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 原始揺らぎの量子性は観測できるか?2021

    • Author(s)
      菅野 優美
    • Organizer
      第34回 理論懇シンポジウム
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Noise and decoherence induced by gravitons2021

    • Author(s)
      Sugumi Kanno
    • Organizer
      Recent progress in theoretical physics based on quantum information theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ブラウン運動とグラビトン2020

    • Author(s)
      菅野 優美
    • Organizer
      九大ー理研ジョイントワークショップ
    • Related Report
      2020 Research-status Report
    • Invited
  • [Remarks] 九州大学 宇宙物理理論研究室

    • URL

      https://cosmologykyushu.wixsite.com/index

    • Related Report
      2022 Annual Research Report
  • [Remarks] Sugumi Kanno Web Site

    • URL

      http://cosmos.phy.tufts.edu/~sugumi/

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2024-01-30  

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