3 papers
gr-qc2026
Almost Universal Metrics
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
A metric is called universal if every symmetric conserved rank-two tensor constructed locally from the metric, the curvature, and covariant derivatives of the curvature is proporti…
gr-qc2026
FLRW-Cosmology in Scalar-Vector-Tensor Theories of Gravity
Metin Gürses, Yaghoub Heydarzade
We generalize our previous theorem for FLRW spacetimes within the framework of generic metric gravity theories. In earlier work, we proved that, in the absence of matter fields, th…
gr-qc2024
Geometric Perfect Fluids and Dark Side of the Universe
Metin Gürses, Yaghoub Heydarzade, Ãetin Åentürk
Recently we showed that in FLRW cosmology, the contribution from higher curvature terms in any generic metric gravity theory to the energy-momentum tensor is of the perfect fluid f…