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Title: Renormalization-group running cosmologies: A scale-setting procedure

Abstract

For cosmologies including scale dependence of both the cosmological and the gravitational constant, an additional consistency condition dictated by the Bianchi identities emerges, even if the energy-momentum tensor of ordinary matter stays individually conserved. For renormalization-group (RG) approaches it is shown that such a consistency relation ineluctably fixes the RG scale (which may have an explicit as well as an implicit time dependence), provided that the solutions of the RG equation for both quantities are known. Hence, contrary to the procedures employed in the recent literature, we argue that there is no more freedom in identification of the RG scale in terms of the cosmic time in such cosmologies. We carefully set the RG scale for the RG evolution phrased in a quantum-gravity framework based on the hypothetical existence of an infrared fixed point, for the perturbative regime within the same framework, as well as for an evolution within quantum field theory in a curved background. In the latter case, the implications of the scale setting for the particle spectrum are also briefly discussed.

Authors:
; ; ;  [1]
  1. Rudjer Boskovic Institute, P.O. Box 180, HR-10002 Zagreb (Croatia)
Publication Date:
OSTI Identifier:
20709585
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 71; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevD.71.124041; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGY; ENERGY-MOMENTUM TENSOR; EVOLUTION; FIELD EQUATIONS; MATHEMATICAL SOLUTIONS; QUANTUM GRAVITY; RENORMALIZATION; TIME DEPENDENCE

Citation Formats

Babic, A, Guberina, B, Horvat, R, and Stefancic, H. Renormalization-group running cosmologies: A scale-setting procedure. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.71.124041.
Babic, A, Guberina, B, Horvat, R, & Stefancic, H. Renormalization-group running cosmologies: A scale-setting procedure. United States. https://doi.org/10.1103/PhysRevD.71.124041
Babic, A, Guberina, B, Horvat, R, and Stefancic, H. Wed . "Renormalization-group running cosmologies: A scale-setting procedure". United States. https://doi.org/10.1103/PhysRevD.71.124041.
@article{osti_20709585,
title = {Renormalization-group running cosmologies: A scale-setting procedure},
author = {Babic, A and Guberina, B and Horvat, R and Stefancic, H},
abstractNote = {For cosmologies including scale dependence of both the cosmological and the gravitational constant, an additional consistency condition dictated by the Bianchi identities emerges, even if the energy-momentum tensor of ordinary matter stays individually conserved. For renormalization-group (RG) approaches it is shown that such a consistency relation ineluctably fixes the RG scale (which may have an explicit as well as an implicit time dependence), provided that the solutions of the RG equation for both quantities are known. Hence, contrary to the procedures employed in the recent literature, we argue that there is no more freedom in identification of the RG scale in terms of the cosmic time in such cosmologies. We carefully set the RG scale for the RG evolution phrased in a quantum-gravity framework based on the hypothetical existence of an infrared fixed point, for the perturbative regime within the same framework, as well as for an evolution within quantum field theory in a curved background. In the latter case, the implications of the scale setting for the particle spectrum are also briefly discussed.},
doi = {10.1103/PhysRevD.71.124041},
url = {https://www.osti.gov/biblio/20709585}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 12,
volume = 71,
place = {United States},
year = {2005},
month = {6}
}