Aspects of Infrared Modifications of Gravity
arXiv:0809.3744
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
References in corpus (16)
- Improved constraints on non-Newtonian forces at 10 microns
- Spontaneous Lorentz and Diffeomorphism Violation, Massive Modes, and Gravity
- Non-Local Modification of Gravity and the Cosmological Constant Problem
- Cascading DGP
- Lorentz-violating graviton masses: getting around ghosts, low strong coupling scale and VDVZ discontinuity
- How (Not) to Palatini
- Strong coupling in brane-induced gravity in five dimensions
- Schwarzschild solution in brane induced gravity
- Effective Field Theory of Gravity: Leading Quantum Gravitational Corrections to Newtons and Coulombs Law
- Vector field theories in cosmology
- Electromagnetically Interacting Massive Spin-2 Field: Intrinsic Cutoff and Pathologies in External Fields
- Modified Gravity: living without Birkhoff I. DGP
- General Massive Spin-2 on de Sitter Background
- Transverse Symmetry and Spin-3/2 Fields
- Massive Gravity in Ads and Minkowski Backgrounds
- On the problem of uniqueness of energy-momentum tensor of gravitational field