Cosmological constant and vacuum energy: old and new ideas
J Sola - Journal of Physics: Conference Series, 2013 - iopscience.iop.org
The cosmological constant (CC) term in Einstein's equations, Λ, was first associated to the
idea of vacuum energy density. Notwithstanding, it is well-known that there is a huge, in fact …
idea of vacuum energy density. Notwithstanding, it is well-known that there is a huge, in fact …
Running Vacuum in the Universe: Phenomenological Status in Light of the Latest Observations, and Its Impact on the σ8 and H0 Tensions
J Solà Peracaula, A Gómez-Valent, J de Cruz Pérez… - Universe, 2023 - mdpi.com
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 …
strengthens the possibility that the vacuum energy density (VED) of the universe is …
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the CDM
J Sola - International Journal of Modern Physics A, 2016 - World Scientific
Next year we will celebrate 100 years of the cosmological term, Λ, in Einstein's gravitational
field equations, also 50 years since the cosmological constant problem was first formulated …
field equations, also 50 years since the cosmological constant problem was first formulated …
Dark energy and gravity
T Padmanabhan - General Relativity and Gravitation, 2008 - Springer
I review the problem of dark energy focussing on cosmological constant as the candidate
and discuss what it tells us regarding the nature of gravity. Section 1 briefly overviews the …
and discuss what it tells us regarding the nature of gravity. Section 1 briefly overviews the …
Interaction in the dark sector: A phenomenological approach
ZC Santana Júnior, MO Costa, RFL Holanda, R Silva - Physical Review D, 2024 - APS
The nongravitational interaction between the dark components of the Universe could lead to
the variation of dark matter energy density standard evolution law. When we assume this …
the variation of dark matter energy density standard evolution law. When we assume this …
Hubble expansion and structure formation in time varying vacuum models
We investigate the properties of the FLRW flat cosmological models in which the vacuum
energy density evolves with time, Λ (t). Using different versions of the Λ (t) model, namely …
energy density evolves with time, Λ (t). Using different versions of the Λ (t) model, namely …
Dynamical vacuum energy in the expanding Universe confronted with observations: a dedicated study
A Gómez-Valent, J Sola… - Journal of Cosmology and …, 2015 - iopscience.iop.org
Despite the many efforts, our theoretical understanding of the ultimate nature of the dark
energy component of the universe still lags well behind the astounding experimental …
energy component of the universe still lags well behind the astounding experimental …
Cosmologies with energy exchange
JD Barrow, T Clifton - Physical Review D—Particles, Fields, Gravitation, and …, 2006 - APS
We provide a simple mathematical description of the exchange of energy between two fluids
in an expanding Friedmann universe with zero spatial curvature. The evolution can be …
in an expanding Friedmann universe with zero spatial curvature. The evolution can be …
Expansion history with decaying vacuum: a complete cosmological scenario
We propose a novel cosmological scenario with the space–time emerging from a pure initial
de Sitter stage and subsequently evolving into the radiation, matter and dark energy …
de Sitter stage and subsequently evolving into the radiation, matter and dark energy …
Complete cosmic history with a dynamical Λ<? format?>=<? format?> Λ (H) term
In the present mainstream cosmology, matter and space-time emerged from a singularity
and evolved through four distinct periods: early inflation, radiation, dark matter, and late-time …
and evolved through four distinct periods: early inflation, radiation, dark matter, and late-time …