219 citations · 916 across the 11 of their papers we have counts for
11 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…
Running vacuum in the Universe: phenomenological status in light of the latest observations, and its impact on the and tensions
Joan Sola Peracaula, Adria Gomez-Valent, Javier de Cruz Perez +1
A substantial body of phenomenological and theoretical work over the last few years strengthens the possibility that the vacuum energy density (VED) of the universe is dynamical, a…
Running vacuum in Brans-Dicke theory: a possible cure for the and tensions
Javier de Cruz Perez, Joan Sola Peracaula
Extensions of the gravitational framework of Brans-Dicke (BD) are studied by considering two different scenarios: i) `BD-CDM', in which a rigid cosmological constant, , is in…
Possible signals of vacuum dynamics in the Universe
Joan Sola Peracaula, Javier de Cruz Perez, Adria Gomez-Valent
We study a generic class of time-evolving vacuum models which can provide a better phenomenological account of the overall cosmological observations as compared to the CDM. Amon…
Dynamical dark energy: scalar fields and running vacuum
Joan Sola, Adria Gomez-Valent, Javier de Cruz Perez
Recent analyses in the literature suggest that the concordance CDM model with rigid cosmological term, const., may not be the best description of the cosmic acceleration. Th…
Dynamical dark energy versus const. in light of observations
Joan Sola Peracaula, Javier de Cruz Perez, Adria Gomez-Valent
After about two decades of the first observational papers confirming the accelerated expansion of the universe, we are still facing the question whether the cause of it is a rigid…
First evidence of running cosmic vacuum: challenging the concordance model
Joan Sola, Adria Gomez-Valent, Javier de Cruz Perez
Despite the fact that a rigid -term is a fundamental building block of the concordance CDM model, we show that a large class of cosmological scenarios with dynamical vacuum e…
Hints of dynamical vacuum energy in the expanding Universe
Joan Sola, Adria Gomez-Valent, Javier de Cruz Perez
Recently there have been claims on model-independent evidence of dynamical dark energy. Herein we consider a fairly general class of cosmological models with a time-evolving cosmol…