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gr-qc2024
Cosmology with explicit and spontaneous background fields
Carlos M. Reyes, César Riquelme, Alex Soto
We study a general class of effective backgrounds that break diffeomorphism invariance and their potential roles in cosmology. Specifically, we examine both explicit and spontaneou…
gr-qc2024
Reduced geometry and its role in explicit spacetime symmetry violation
Carlos M. Reyes, César Riquelme, Marco Schreck +1
The incompatibility of explicit diffeomorphism violation with Riemannian geometry within the gravitational Standard-Model Extension (SME) is revisited. We review two methods of how…