Explicit Diffeomorphism Breaking, No-go Conditions, and the Gravity Sector of the SME

2022/07/17 by Bluhm, Robert
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2207.08250

Abstract

A brief recap is given of issues that can occur when fixed nondynamical backgrounds that explicitly break diffeomorphism invariance are included in gravity theories. Implications for the Standard-Model Extension (SME) are summarized, including recent results showing how the SME can be modified to accommodate such fixed nondynamical backgrounds.

Related

• The SME with gravity and explicit diffeomorphism breaking
• Background Fields and Gravity
• Cosmic Backgrounds in the Gravitational Standard-Model Extension
• Gravity with background fields and diffeomorphism breaking
• Reduced geometry and its role in explicit spacetime symmetry violation