Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Peracaula, Joan Sola"'
The cosmological constant term (CC), $\Lambda$, is a pivotal ingredient in the standard model of cosmology or $\Lambda$CDM, but it is a rigid quantity for the entire cosmic history. This is unnatural and inconsistent. Different theoretical and phenom
Externí odkaz:
http://arxiv.org/abs/2411.06582
Autor:
Peracaula, Joan Solà
The possibility that the vacuum energy density (VED) could be time dependent in the expanding Universe is intuitively more reasonable than just a rigid cosmological constant for the entire cosmic history. The framework of the running vacuum model (RV
Externí odkaz:
http://arxiv.org/abs/2410.20382
Publikováno v:
2024 ApJ 975 64
The idea of composite dark energy (DE) is quite natural since on general grounds we expect that the vacuum energy density (associated with the cosmological term $\Lambda$) may appear in combination with other effective forms of DE, denoted X. Here we
Externí odkaz:
http://arxiv.org/abs/2404.18845
Autor:
Peracaula, Joan Solà
Publikováno v:
International Journal of Modern Physics A, 2024
The possibility that the vacuum energy density (VED), $\rho_{\rm vac}$, could be time dependent in the expanding Universe is intuitively more reasonable than just a rigid cosmological constant for the entire cosmic history. The dynamics of $\rho_{\rm
Externí odkaz:
http://arxiv.org/abs/2308.13349
In the context of a string-inspired running vacuum model (RVM) of cosmology with anomalies and torsion-induced axion-like fields, we discuss quantum corrections to the corresponding energy density, in approximately de Sitter eras, during which the Hu
Externí odkaz:
http://arxiv.org/abs/2307.13130
We discuss the potential alleviation of both the Hubble and the growth of galactic structure data tensions observed in the current epoch of Cosmology in the context of the so-called Stringy Running Vacuum Model (RVM) of Cosmology. This is a gravitati
Externí odkaz:
http://arxiv.org/abs/2305.15774
Publikováno v:
Universe 2023, Volume 9, Issue 6, 262
A substantial body of phenomenological and theoretical work over the last few years strengthens the possibility that the vacuum energy density (VED) of the universe is dynamical, and in particular that it adopts the `running vacuum model' (RVM) form,
Externí odkaz:
http://arxiv.org/abs/2304.11157
Publikováno v:
Physics of the Dark Universe 43 (2024) 101406
Extensions of the gravitational framework of Brans-Dicke (BD) are studied by considering two different scenarios: i) `BD-$\Lambda$CDM', in which a rigid cosmological constant, $\Lambda$, is included, thus constituting a BD version of the vanilla conc
Externí odkaz:
http://arxiv.org/abs/2302.04807
Phenomenological work in the last few years has provided significant support to the idea that the vacuum energy density (VED) is a running quantity with the cosmological evolution and that this running helps to alleviate the cosmological tensions aff
Externí odkaz:
http://arxiv.org/abs/2301.05205
Autor:
Rezaei, Mehdi, Peracaula, Joan Sola
Publikováno v:
Eur. Phys. J. C (2022) 82:765
We perform a comparative study of different types of dynamical dark energy models (DDES) using the cosmographic method. Among the models being examined herein we have the Running Vacuum models (RVMs), which have demonstrated considerable ability to f
Externí odkaz:
http://arxiv.org/abs/2207.14250