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oai:ir.soken.ac.jp:00003338 2023-06-20T14:33:11Z 1:281 1:284

Space-time evolution and CMB anisotropies from quantum gravity Space-time evolution and CMB anisotropies from quantum gravity 湯川, 哲之 HAMADA, Ken-ji HORATA, Shinichi YUKAWA, Tetsuyuki metadata only access © 2006 The American Physical Society We propose an evolutional scenario of the universe which starts from quantum states with conformal invariance, passing through the inflationary era, and then makes a transition to the conventional Einstein space-time. The space-time dynamics is derived from the renormalizable higher-derivative quantum gravity on the basis of a conformal gravity in four dimensions. Based on the linear perturbation theory in the inflationary background, we simulate evolutions of gravitational scalar, vector, and tensor modes, and evaluate the spectra at the transition point located at the beginning of the big bang. The obtained spectra cover the range of the primordial spectra for explaining the anisotropies in the homogeneous cosmic microwave background. American Physical Society 2006-12-01 eng journal article https://ir.soken.ac.jp/records/3338 https://doi.org/10.1103/PhysRevD.74.123502 10.1103/PhysRevD.74.123502 15507998 Physical Review D - Particles, Fields, Gravitation and Cosmology Physical Review D - Particles, Fields, Gravitation and Cosmology 74 12