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2017 年度 実施状況報告書

Modified Supergravity Models of Cosmological Inflation and Particle Production in Early Universe

研究課題

研究課題/領域番号 26400252
研究機関首都大学東京

研究代表者

Sergei V.Ketov  首都大学東京, 理工学研究科, 准教授 (70347269)

研究期間 (年度) 2014-04-01 – 2019-03-31
キーワードinflation / modified gravity / supergravity / dark energy / string theory
研究実績の概要

During the relevant fiscal year FY2017 we continued our efforts towards a unified theoretical description of cosmological inflation, dark energy and dark matter in
the early Universe, and their connection/relation to high-energy physics beyond the Standard Model of elementary particles, in the context of supergravity theory. In the FY2017 we achieved a peak of our publication activity referring to the results of the conducted research (6 refereed publications in the high-ranking international peer-reviewed journals of physics, in the Q1 and Q2 categories, according to the Web of Science). We have already achieved four out of five our main research objectives in this research project.

現在までの達成度 (区分)
現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

We reached the main objectives of our research project started four years ago, as regards (i) viable description of cosmological inflation in supergravity theory, (ii) unification of cosmological inflation and dark energy
(represented by a de Sitter vacuum) in supergravity, (iii) spontaneous supersymmetry breaking after inflation, in the context of high-scale (broken) supersymmetry, (iv) derivation of Starobinsky-like cosmological inflation from higher dimensions, and (v) exploring realisations of inflation and dark energy in type-IIA superstrings compactified on rigid Calabi-Yau three-folds. Our results appeared in six original research papers, with Q1 or Q2 ranking (Web of Science). A limited progress was achieved in a viable description of reheating and particle production after inflation, based on our models.

今後の研究の推進方策

During the last (fifth) year of our research project we are going to concentrate on a theoretical investigation of reheating and particle production in the early Universe after inflation, by using the inflationary supergravity models we constructed earlier, with the spontaneous supersymmetry breaking mechanism we proposed. The dark matter, presumably described by gravitino as the lightest supersymmetric partner of the known elementary particles, will be in the focus of our research, including production of other particles in the early Universe, based on our original scenario. We are also planning to study primordial black holes as (possible) part of dark matter. Our plans include presentations of our research results at major international conferences in cosmology during the next FY2018 too.

次年度使用額が生じた理由

The 225,000 yen left from the previous FY2017 will be used during the next fiscal year FY2018 towards joint research with our collaborators in Japan and overseas, and attending international conferences for presentation of our research results.

  • 研究成果

    (6件)

すべて 2018 2017

すべて 雑誌論文 (6件) (うち国際共著 6件、 査読あり 6件、 オープンアクセス 1件)

  • [雑誌論文] Removing instability of inflation in Polonyi-Starobinsky supergravity by adding FI term2018

    • 著者名/発表者名
      Y. Aldabergenov, S.V. Ketov
    • 雑誌名

      Mod. Phys. Lett. A

      巻: 91 ページ: 1850032, 1-8

    • DOI

      10.1142/S0217732318500323

    • 査読あり / 国際共著
  • [雑誌論文] Inflation from higher dimensions2017

    • 著者名/発表者名
      Hiroshi Nakada, Sergei V. Ketov
    • 雑誌名

      Physical Reviews

      巻: D96 ページ: 123530: 1-13

    • DOI

      10.1103/PhysRevD.96.123530

    • 査読あり / 国際共著
  • [雑誌論文] No inflation in type IIA strings on rigid CY spaces2017

    • 著者名/発表者名
      Yuki Wakimoto, Sergei V. Ketov
    • 雑誌名

      Progress of Theoretical and Experimental Physics

      巻: 2017 ページ: 083E02:1-13

    • DOI

      10.1093/ptep/ptx094

    • 査読あり / オープンアクセス / 国際共著
  • [雑誌論文] Higgs mechanism and cosmological constant in N=1 supergravity with inflaton in a vector multiplet2017

    • 著者名/発表者名
      Yermek Aldabergenov, Sergei V. Ketov
    • 雑誌名

      European Physical Journal

      巻: C77 ページ: 233: 1-6

    • DOI

      10.1140/epjc/s10052-017-4807-8

    • 査読あり / 国際共著
  • [雑誌論文] Inflation from (R+gamma R^n -2Lambda) gravity in higher dimensions2017

    • 著者名/発表者名
      Sergei V. Ketov, Hiroshi Nakada
    • 雑誌名

      Physical Reviews

      巻: D95 ページ: 103507: 1-7

    • DOI

      10.1103/PhysRevD.95.103507

    • 査読あり / 国際共著
  • [雑誌論文] Energy conditions in Starobinsky supergravity2017

    • 著者名/発表者名
      Andrea Addazi, Sergei V. Ketov
    • 雑誌名

      Journal of Cosmology and Astroparticle Physics

      巻: 1703 ページ: 061: 1-9

    • DOI

      10.1088/1475-7516/2017/03/061

    • 査読あり / 国際共著

URL: 

公開日: 2018-12-17  

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