On Friedmann-Lema\^ıtre-Robertson-Walker cosmologies in non-standard gravity

Abstract

The present thesis is focused on the study of FLRW cosmology in modified gravities and with scalar fields. The mystery of dark energy has made that the last decade, many efforts in theoretical physics have been focused on the explanation of the current acceleration of the Universe expansion. On the other hand, an early accelerated epoch, known as inflation, is also required in the standard cosmological model in order to fit the observational data. Here, we study the possibility to explain both effects under the same mechanism, by means of scalar fields or modified gravity. In this sense, F(R) and Gauss-Bonnet gravities are studied. This analysis is also extended to Hořava-Lifshitz gravity, a theory that seems to be power counting renormalizable, in spite of it contains other serious problems that are also discussed in the thesis.

PhD thesis, March 2011, University of Barcelona. 176 pages. Language: English. Preface in Spanish and Catalan. 13 chapters

References in corpus (84)

• Dynamics of dark energy
• Quantum Gravity at a Lifshitz Point
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Disappearing cosmological constant in f(R) gravity
• Extra force in $f(R)$ modified theories of gravity
• Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
• Extended Theories of Gravity and their Cosmological and Astrophysical Applications
• Dark energy in modified Gauss-Bonnet gravity: late-time acceleration and the hierarchy problem
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Membranes at Quantum Criticality
• Conditions for the cosmological viability of f(R) dark energy models
• Can dark energy evolve to the Phantom?
• Modified f(R) gravity unifying R^m inflation with \LambdaCDM epoch
• Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints
• Dark energy cosmology from higher-order, string-inspired gravity and its reconstruction
• Horava-Lifshitz Cosmology
• Future of the universe in modified gravitational theories: Approaching to the finite-time future singularity
• Construction of cosmologically viable f(G) gravity models
• The Cosmology of f(R) Gravity in the Metric Variational Approach
• String-inspired Gauss-Bonnet gravity reconstructed from the universe expansion history and yielding the transition from matter dominance to dark energy
• The Cosmology of Modified Gauss-Bonnet Gravity
• Limit to General Relativity in f(R) theories of gravity
• The Newtonian Limit of F(R) gravity
• Solar system and equivalence principle constraints on f(R) gravity by chameleon approach
• Chiral Primordial Gravitational Waves from a Lifshitz Point
• Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
• The future evolution and finite-time singularities in $F(R)$-gravity unifying the inflation and cosmic acceleration
• Dark Energy: the equation of state description versus scalar-tensor or modified gravity
• The new form of the equation of state for dark energy fluid and accelerating universe
• Cosmologies with Energy Exchange
• Reconstructing the universe history, from inflation to acceleration, with phantom and canonical scalar fields
• The (pseudo)issue of the conformal frame revisited
• A f(R) gravity without cosmological constant
• de Sitter space and the equivalence between f(R) and scalar-tensor gravity
• The Black Hole and Cosmological Solutions in IR modified Horava Gravity
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• The evolution of density perturbations in f(R) gravity
• Classification of cosmological milestones
• Holographic dark energy with varying gravitational constant
• Dynamics of Nonlocal Cosmology
• Dark energy from modified F(R)-scalar-Gauss-Bonnet gravity
• Static spherically symmetric perfect fluid solutions in $f(R)$ theories of gravity
• Quantum phantom cosmology
• A Trouble with Hořava-Lifshitz Gravity
• Avoidance of future singularities in loop quantum cosmology
• Coupled oscillators as models of quintom dark energy
• On the evolution of density perturbations in f(R) theories of gravity
• Classifying and avoiding singularities in the alternative gravity dark energy models
• The oscillating dark energy: future singularity and coincidence problem
• Viability of f(R) Theories with Additional Powers of Curvature
• Two-Field Quintom Models in the w-w' Plane
• On the way from matter-dominated era to dark energy universe
• Viscous Ricci Dark Energy
• Thermodynamics in $F(R)$ gravity with phantom crossing
• The phase space view of f(R) gravity
• Stability of the Einstein static universe in modified Gauss-Bonnet gravity
• On the Stability of a class of Modified Gravitational Models
• Modified gravity as an alternative for Lambda-CDM cosmology
• Initial and final de Sitter universes from modified $f(R)$ gravity
• Can higher curvature corrections cure the singularity problem in f(R) gravity?
• Can f(R) Modified Gravity Theories Mimic a LCDM Cosmology?
• On the co-existence of matter dominated and accelerating solutions in f(G)-gravity
• Delicate f(R) gravity models with disappearing cosmological constant and observational constraints on the model parameters
• Phantom field dynamics in loop quantum cosmology
• On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?
• Cosmological evolution in vector-tensor theories of gravity
• Strings at future singularities
• Crossing of the w=-1 barrier in viscous modified gravity
• Consistency of $f(R)=\sqrt{R^2-R_0^2}$ Gravity with the Cosmological Observations in Palatini Formalism
• New "Bigs" in cosmology
• Relaxing a large cosmological constant
• Natural Phantom Dark Energy, Wiggling Hubble Parameter $H(z)$ and Direct $H(z)$ Data
• Dark Energy Fluid with Time-Dependent, Inhomogeneous Equation of State
• Hamiltonian Analysis of Non-Relativistic Covariant RFDiff Horava-Lifshitz Gravity
• The solution of the cosmological constant problem from the inhomogeneous equation of state - a hint from modified gravity?
• Stability of cosmological solutions in F(R) Horava-Lifshitz gravity
• Reconstructing the properties of dark energy from recent observations
• Exponential Potentials and Attractor Solution of Dilatonic Cosmology
• A primer on problems and prospects of dark energy
• Can Phantom-Dominated Universe Decelerate Also in Future ?
• A Universe Dominated by Dilaton Field
• Scalar-Tensor theories and current Cosmology
• Entropy Bounds in Spherical Space