4 papers
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…
Using non-DESI data to confirm and strengthen the DESI 2024 spatially-flat CDM cosmological parameterization result
Chan-Gyung Park, Javier de Cruz Perez, Bharat Ratra
We use a combination of Planck cosmic microwave background (CMB) anisotropy data and non-CMB data that include Pantheon+ type Ia supernovae (SNIa), Hubble parameter [], growt…
Updated observational constraints on spatially-flat and non-flat CDM and XCDM cosmological models
Javier de Cruz Perez, Chan-Gyung Park, Bharat Ratra
We study 6 LCDM models, with 4 allowing for non-flat geometry and 3 allowing for a non-unity lensing consistency parameter . We also study 6 XCDM models with a dynamical dark…
A unified TDiff invariant field theory for the dark sector
David Alonso-López, Javier de Cruz Pérez, Antonio L. Maroto
In this work we present a unified model for the cosmological dark sector. The theory is based on a simple minimally coupled scalar field whose action only contains a canonical kine…