Aspects of Infrared Modifications of Gravity

Abstract

In the first part of the thesis, and after an introduction to certain models of modified gravity, we study consistent Lagrangians for Lorentz invariant (massive and massless) spin-2 and spin-3/2 particles in flat space. The second part of the dissertation is devoted to non-linear extensions for the spin-2 case, focusing on unimodular gravity and bigravity. Both theories lead to modifications of General Relativity at large distances and we will study exact solutions, causal structure of those solutions, and perturbation theory (specially for the Lorentz breaking case). Some comments on quantization of these theories can be found in an appendix.

Ph.D. Thesis, 168 pages, 12 figures

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Cited by in corpus (20)

• Spin-2 spectrum of defect theories
• Scale-invariant alternatives to general relativity
• Lorentz Breaking Massive Gravity in Curved Space
• Nonpropagation of scalar in the deformed Hořava-Lifshitz gravity
• Propagations of massive graviton in the deformed Hořava-Lifshitz gravity
• The bigravity black hole and its thermodynamics
• Bigravity in Kuchar's Hamiltonian formalism. 1. The general case
• TDiff and Weyl Invariant Massive Spin-2: Linear Theory
• Bigravity in Kuchar's Hamiltonian formalism. 2. The special case
• Completing Lorentz violating massive gravity at high energies
• Hamiltonian Analysis of the Higgs Mechanism for Graviton
• No Conformal Anomaly in Unimodular Gravity
• First Order formulation of Unimodular Gravity
• Geometrothermodynamics of black holes in Lorentz non-invariant massive gravity
• On higher spin analogues of linearized Topologically Massive Gravity and linearized "New Massive Gravity"
• Critical gravity as van Dam-Veltman-Zakharov discontinuity in anti de Sitter space
• Horava-Lifshitz Gravity And Ghost Condensation
• Ultralocal energy density in massive gravity
• Weyl and transverse diffeomorphism invariant spin-2 models in D=2+1
• Canonical formalism of bigravity