The cosmological constant problem and running vacuum in the expanding universe

J Sola Peracaula - … Transactions of the Royal Society A, 2022 - royalsocietypublishing.org
It is well known that quantum field theory (QFT) induces a huge value of the cosmological
constant (CC), Λ, which is outrageously inconsistent with cosmological observations. We …

Renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem

C Moreno-Pulido, J Solà Peracaula - The European Physical Journal C, 2022 - Springer
The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued
with theoretical conundrums related not only with the renormalization procedure itself, but …

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 …

First evidence of running cosmic vacuum: challenging the concordance model

J Solà, A Gómez-Valent… - The Astrophysical …, 2017 - iopscience.iop.org
Despite the fact that a rigid ${\rm {\Lambda}} $-term is a fundamental building block of the
concordance ΛCDM model, we show that a large class of cosmological scenarios with …

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 …

Equation of state of the running vacuum

C Moreno-Pulido, JS Peracaula - The European Physical Journal C, 2022 - Springer
Recent studies of quantum field theory in FLRW spacetime suggest that the cause of the
speeding up of the universe is the running vacuum (RV), see Moreno-Pulido and Solà …

Brans–Dicke cosmology with a Λ-term: a possible solution to ΛCDM tensions

JS Peracaula, A Gómez-Valent… - … and Quantum Gravity, 2020 - iopscience.iop.org
We present a full-fledged analysis of Brans–Dicke cosmology with a cosmological constant
and cold dark matter (BD-ΛCDM for short). We extend the scenarios where the current …

Possible signals of vacuum dynamics in the Universe

J Solà Peracaula, J de Cruz Pérez… - Monthly Notices of the …, 2018 - academic.oup.com
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 Λ …

Hints of dynamical vacuum energy in the expanding Universe

J Sola, A Gomez-Valent… - The Astrophysical …, 2015 - iopscience.iop.org
Recently there have been claims of model-independent evidence of dynamical dark energy.
Herein we consider a fairly general class of cosmological models with a time-evolving …

Gravitational and chiral anomalies in the running vacuum universe and matter-antimatter asymmetry

S Basilakos, NE Mavromatos, J Solà Peracaula - Physical Review D, 2020 - APS
We present a model for the Universe in which quantum anomalies are argued to play an
important dual role: they are responsible for generating matter-antimatter asymmetry in the …