Running cosmological constant with observational tests

Abstract

We investigate the running cosmological constant model with dark energy linearly proportional to the Hubble parameter, $\Lambda =\sigma H+{\Lambda }_0$, in which the $\Lambda$CDM limit is recovered by taking $\sigma =0$. We derive the linear perturbation equations of gravity under the Friedmann-Lemaïtre-Robertson-Walker cosmology, and show the power spectra of the CMB temperature and matter density distribution. By using the Markov chain Monte Carlo method, we fit the model to the current observational data and find that $\sigma H_0/{\Lambda }_0\lesssim 2.63\times 10^{-2}$ and $6.74\times 10^{-2}$ for $\Lambda (t)$ coupled to matter and radiation-matter, respectively, along with constraints on other cosmological parameters.

12 pages, 5 figures, version accepted by PLB

References in corpus (32)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Dynamics of dark energy
• Efficient Computation of CMB anisotropies in closed FRW models
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
• Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
• The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• Evolution of the Scale Factor with a Variable Cosmological Term
• On the possible running of the cosmological "constant"
• Cosmologies with Energy Exchange
• Hubble expansion & Structure Formation in Time Varying Vacuum Models
• Dark Energy and QCD Ghost
• Decaying Vacuum Energy and Deflationary Cosmology in Open and Closed Universes
• A New Perspective on Cosmic Coincidence Problems
• Interpreting Cosmological Vacuum Decay
• A cosmological constant from the QCD trace anomaly?
• Notes on Ghost Dark Energy
• Friedmann cosmology with decaying vacuum density
• Gluonic vacuum, q-theory, and the cosmological constant
• Decay of cosmological constant as Bose condensate evaporation
• The Running of the Cosmological and the Newton Constant controlled by the Cosmological Event Horizon
• Observational constraints on late-time Lambda(t) cosmology
• Decaying Lambda cosmology, varying G and holography
• A cosmological concordance model with dynamical vacuum term
• Evolution of density perturbations in decaying vacuum cosmology
• Evolution of density perturbations in decaying vacuum cosmology: The case of non-zero perturbations in the cosmological term
• Cosmological dark energy from the cosmic QCD phase transition and colour entanglement

Cited by in corpus (7)

• Possible signals of vacuum dynamics in the Universe
• Constraints on running vacuum model with $H(z)$ and $f{\sigma }_8$
• Consistency of nonlinear interacting ghost dark energy with recent observations
• Constraints on a special running vacuum model
• Running vacuum model in non-flat universe
• Observational constraints on running vacuum model
• Matter density perturbation and power spectrum in running vacuum model