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Title: Rastall’s cosmology and its observational constraints

The Rastall’s theory is a modification of General Relativity touching one of the cornestone of gravity theory: the conservation laws. In Rastall’s theory, the energy-momentum tensor is not conserved anymore, depending now on the gradient of the Ricci curvature. In this sense, this theory can be seen as a classical implementation of quantum effects in a curved background space-time. We exploit this structure in order to reproduce some results of an effective theory of quantum loop cosmology. Later, we propose a model for the dark sector of the universe. In this case, the corresponding ΛCDM model appears as the only model consistent with observational data.
Authors:
; ;  [1] ;  [2]
  1. Departamento de Física - Universidade Federal do Espirito Santo (Brazil)
  2. Université de Niamey (Niger)
Publication Date:
OSTI Identifier:
22391032
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1647; Journal Issue: 1; Conference: Conference on Cosmology and Gravitation in the Southern Cone, Valparaiso (Chile), 27-31 May 2013; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CONSERVATION LAWS; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; COSMOLOGY; DIAGRAMS; ENERGY-MOMENTUM TENSOR; GENERAL RELATIVITY THEORY; GRAVITATION; LIMITING VALUES; LOOP QUANTUM GRAVITY; MODIFICATIONS; SPACE-TIME; UNIVERSE