3 papers
astro-ph.CO2026
The silent dark sector: a field-theory approach to unified dark fluids with vanishing speed of sound
Javier de Cruz Pérez, Darío Jaramillo-Garrido, Antonio L. Maroto +1
We introduce a novel class of field-theory models that provide a unified description of the dark sector as a single perfect fluid with vanishing sound speed. These models also admi…
gr-qc2023
TDiff in the Dark: Gravity with a scalar field invariant under transverse diffeomorphisms
Darío Jaramillo-Garrido, Antonio L. Maroto, Prado Martín-Moruno
We reflect on the possibility of having a matter action that is invariant only under transverse diffeomorphisms. This possibility is particularly interesting for the dark sector, w…
gr-qc2023
Graviton-photon oscillation in a cosmic background for a general theory of gravity
José A. R. Cembranos, Miguel González Ortiz, Prado Martín-Moruno
Graviton-photon oscillation is the conversion of gravitational waves to electromagnetic waves and vice versa in the presence of a background electromagnetic field. We investigate t…