Running Vacuum from Dynamical Spacetime Cosmology

S. Banerjee, D. Benisty, E. I. Guendelman

Research output: Contribution to journalArticle

Abstract

Running Dark Energy and Dark Matter models are candidates to resolve the Hubble constant tension. However the model does
not consider a Lagrangian formulation directly. In this paper we formulate an action principle where the Running Vacuum Model (RVM) is obtained from an action principle, with a scalar field model for the whole dark components. The Dynamical Spacetime vector field χµ is a Lagrange multiplier that forces the kinetic term of the scalar field to behave as the modified dark matter. When we replace the vector field by a derivative of a scalar the model predicts diffusion interactions between the dark components with a different correspondence to the RVM. We test the models with the Cosmic Chronometers, Type Ia Supernova, Quasars, Gamma ray Bursts and the Baryon Acoustic Oscillations data sets. We find that ΛCDM is still the best model. However this formulation suggests an action principle for the RVM model and other extensions.
Original languageEnglish GB
Journalarxiv gr-qc
StatePublished - 2020

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