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Title: Conformal-frame (in)dependence of cosmological observations in scalar-tensor theory

We provide the correspondence between the variables in the Jordan frame and those in the Einstein frame in scalar-tensor gravity and consider the frame-(in)dependence of the cosmological observables. In particular, we show that the cosmological observables/relations (redshift, luminosity distance, temperature anisotropies) are frame-independent. We also study the frame-dependence of curvature perturbations and find that the curvature perturbations are conformal invariant if the perturbation is adiabatic and the entropy perturbation between matter and the Brans-Dicke scalar is vanishing. The relation among various definitions of curvature perturbations in the both frames is also discussed, and the condition for the equivalence is clarified.
Authors:
 [1] ;  [2]
  1. Department of Physics, College of Humanities and Sciences, Nihon University, Tokyo 156-8550 (Japan)
  2. Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)
Publication Date:
OSTI Identifier:
22282613
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; BRANES; COSMOLOGY; DISTANCE; ENTROPY; GRAVITATION; LUMINOSITY; PERTURBATION THEORY; RED SHIFT; SCALARS; TENSORS