Lorentz and Diffeomorphism Violations in Linearized Gravity
classification
🌀 gr-qc
astro-ph.HEhep-ph
keywords
diffeomorphismgravitylinearizedlorentzviolationsarbitraryclassificationconstructed
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Lorentz and diffeomorphism violations are studied in linearized gravity using effective field theory. A classification of all gauge-invariant and gauge-violating terms is given. The exact covariant dispersion relation for gravitational modes involving operators of arbitrary mass dimension is constructed, and various special limits are discussed.
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Without Lorentz invariance, double Wick rotations connect inequivalent field theories in flat spacetime, with criteria for when propagating modes, unitarity, and renormalizability fail to translate.
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