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gr-qc2026
New constraints on modified gravity with dimension-six operators from gravitational waves
Justo López-Sarrión, Carlos M. Reyes, César Riquelme +1
The present article deals with gravitational-wave propagation affected by higher-derivative terms that break spacetime symmetries. Two dimension-6 contributions of the gravitationa…
gr-qc2026
Gödel-symmetric backgrounds and explicit spacetime symmetry breaking
César Riquelme, Carlos M. Reyes, A. F. Santos
Explicit breaking of diffeomorphism symmetry with nondynamical background fields in gravitational theories can lead to inconsistencies between the equations of motion and the under…