Construction of Models reproducing History of Universe based on Modified Gravity Theories

2015 Fiscal Year Final Research Report

• Project/Area Number: 23540296
• 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: Nagoya University
• Principal Investigator: Nojiri Shin'ichi 名古屋大学, 理学(系)研究科(研究院), 教授 (00432229)
• Project Period (FY): 2011-04-28 – 2016-03-31
• Keywords: 暗黒エネルギー / 修正重力理論 / インフレーション

Outline of Final Research Achievements

I have investigated many kinds of modified gravity theories, that is, F(R) gravity, Galileon models, massive gravity, bi-gravity, domain wall model, Born-Infeld gravity, mimetic model, unimodular gravity, etc.I have extended them so that the models could describe the evolution of the universe, and found constraints on the models. Then I found that most of the model can reproduce the evolution of the universe if we give some constraints on the parameters of the models, We should note, however, that there is no model which could be completely natural. Furthermore I have also found that it could be difficult to satisfy the consistencies as a quantum theory.

Free Research Field

素粒子的宇宙論