From conformal field theory spectra to CMB multipoles in quantum gravity cosmology

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.083533· OSTI ID:21409586

Hamada, Ken-ji ^[1]; Horata, Shinichi; Yukawa, Tetsuyuki ^[2]

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1. Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801 (Japan) and Department of Particle and Nuclear Physics, Graduate University for Advanced Studies (Sokendai), Tsukuba 305-0801 (Japan)
2. Hayama Center for Advanced Studies, Graduate University for Advanced Studies (Sokendai), Hayama 240-0193 (Japan)

We study the inflation process of the Universe based on the renormalizable quantum gravity formulated as a conformal field theory. We show that the power-law conformal field theory spectrum approaches that of the Harrison-Zel'dovich-Peebles-type as the amplitude of gravitational potential gradually reduces during the inflation. The non-Gaussanity parameter is preserved within an order of unity due to the diffeomorphism invariance. Sharp falloff of the angular power spectrum of cosmic microwave background at large scale is understood as a consequence of the existence of dynamical scale of the quantum gravity {Lambda}{sub QG}({approx_equal}10{sup 17} GeV). The angular power spectra are computed and compared with the WMAP5 and ACBAR data with a quality of {chi}{sup 2}/dof{approx_equal}1.1.

• OSTI ID: 21409586
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 8; Other Information: DOI: 10.1103/PhysRevD.81.083533; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
CONFORMAL INVARIANCE
COSMOLOGY
INFLATIONARY UNIVERSE
MULTIPOLES
QUANTUM FIELD THEORY
QUANTUM GRAVITY
RELICT RADIATION
SPECTRA
UNIVERSE
COSMOLOGICAL MODELS
ELECTROMAGNETIC RADIATION
FIELD THEORIES
INVARIANCE PRINCIPLES
MATHEMATICAL MODELS
MICROWAVE RADIATION
RADIATIONS