Rastall cosmology

Abstract

We review the difficulties of the generalized Chaplygin gas model to fit observational data, due to the tension between background and perturbative tests. We argue that such issues may be circumvented by means of a self-interacting scalar field representation of the model. However, this proposal seems to be successful only if the self-interacting scalar field has a non-canonical form. The latter can be implemented in Rastall's theory of gravity, which is based on a modification of the usual matter conservation law. We show that, besides its application to the generalized Chaplygin gas model, other cosmological models based on Rastall's theory have many interesting and unexpected new features.

Latex file, 10 pages, 1 figure in eps format. Proceedings of the conference IWARA2011, 09-12 october 2011, Joao Pessoa, Brasil

References in corpus (3)

• Le Chatelier-Braun principle in cosmological physics
• WMAP5 constraints on the unified model of dark energy and dark matter
• Matter power spectrum for the generalized Chaplygin gas model: The relativistic case

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• A New Model of Quintessence Compact Stars in Rastall Theory of Gravity
• Non-trivial class of anisotropic compact stellar model in Rastall gravity
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• Cosmological consequences in the framework of generalized Rastall theory of gravity
• To conserve, or not to conserve: A review of nonconservative theories of gravity
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• Neutral regular black hole solution in generalized Rastall gravity
• Quasinormal Modes of Non-Linearly Charged Black Holes surrounded by a Cloud of Strings in Rastall Gravity
• Bouncing solutions in Rastall's theory with a barotropic fluid
• The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion
• The criteria of the anisotropic quark star models in Rastall gravity
• Cosmic evolution of dark energy in a generalized Rastall gravity
• Generalized Rastall's gravity and its effects on compact objects
• Abelian-Higgs strings in Rastall gravity
• Higher dimensional power-Maxwell charged black holes in Einstein and Rastall gravity
• A thermodynamics revision of Rastall gravity
• Rapidly rotating compact stars in Rastall's gravity
• More on the fact that Rastall = GR
• Null Fluid collapse in Rastall theory of gravity
• $4$-index theory of gravity and its relation with the violation of the energy-momentum conservation law
• Lemaitre-Tolman-Bondi Static Universe in Rastall-like Gravity
• $\kappa (R,T)$ gravity
• Charged analog of anisotropic dark energy star in Rastall gravity
• Primordial Black Hole Formation in Rastall Gravity: Shifted Collapse Threshold and Exponential Abundance Sensitivity
• Neutrino Interactions with perturbed Rastall Gravity: A Novel Approach to Reducing the Hubble Tension
• Light propagation around a Kerr-like black hole immersed in an inhomogeneous anisotropic plasma in Rastall gravity: Analytical solutions to the equations of motion
• Singularity Avoidance in Gravitational Collapse of an Inhomogeneous Fluid in Rastall Gravity