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

    https://doi.org/10.1142/9789811275388_0035Cited by:0 (Source: Crossref)
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    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 are summarized, including recent results showing how the Standard-Model Extension can be modified to accommodate such fixed nondynamical backgrounds.