TL;DR
This paper reviews theoretical features of gravitational theories that violate Lorentz symmetry, discussing mechanisms like spontaneous breaking, Nambu-Goldstone modes, and potential Higgs mechanisms in gravity.
Contribution
It provides a concise overview of the theoretical landscape of Lorentz-violating gravity, highlighting key features and mechanisms involved.
Findings
Evasion of no-go theorems in Lorentz-violating gravity
Connections between Lorentz and diffeomorphism breaking
Potential for Higgs mechanism in gravitational theories
Abstract
Gravitational theories with Lorentz violation must account for a number of possible features in order to be consistent theoretically and phenomenologically. A brief summary of these features is given here. They include evasion of a no-go theorem, connections between spontaneous Lorentz breaking and diffeomorphism breaking, the appearance of massless Nambu-Goldstone modes and massive Higgs modes, and the possibility of a Higgs mechanism in gravity.
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Taxonomy
TopicsNoncommutative and Quantum Gravity Theories · Black Holes and Theoretical Physics · Algebraic and Geometric Analysis