Probing dynamics of dark energy with latest observations

Abstract

We examine the validity of the $\Lambda$CDM model, and probe for the dynamics of dark energy using latest astronomical observations. Using the $Om(z)$ diagnosis, we find that different kinds of observational data are in tension within the $\Lambda$CDM framework. We then allow for dynamics of dark energy and investigate the constraint on dark energy parameters. We find that for two different kinds of parametrisations of the equation of state parameter $w$, a combination of current data mildly favours an evolving $w$, although the significance is not sufficient for it to be supported by the Bayesian evidence. A forecast of the DESI survey shows that the dynamics of dark energy could be detected at $7\sigma$ confidence level, and will be decisively supported by the Bayesian evidence, if the best fit model of $w$ derived from current data is the true model.

4.5 pages, 3 figures, 1 table; references added

References in corpus (9)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• The trouble with $H_0$
• Two new diagnostics of dark energy
• PolyChord: nested sampling for cosmology
• Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
• Tension between the power spectrum of density perturbations measured on large and small scales
• A litmus test for Lambda
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in Fourier space

Cited by in corpus (18)

• Can interacting dark energy solve the $H_0$ tension?
• Constraining Dark Energy Dynamics in Extended Parameter Space
• A Vacuum Phase Transition Solves $H_0$ Tension
• Beyond $\Lambda$CDM with Low and High Redshift Data: Implications for Dark Energy
• Baryon acoustic oscillation, Hubble parameter, and angular size measurement constraints on the Hubble constant, dark energy dynamics, and spatial curvature
• Constraints on dark energy dynamics and spatial curvature from Hubble parameter and baryon acoustic oscillation data
• Observational Constraints on Oscillating Dark-Energy Parametrizations
• Inflation in a closed universe
• Bayesian Evidence against Harrison-Zel'dovich spectrum in tension cosmology
• The cosmological impact of future constraints on $H_0$ from gravitational-wave standard sirens
• Cosmology With Low-Redshift Observations: No Signal For New Physics
• Strong Bounds on Sum of Neutrino Masses in a 12 Parameter Extended Scenario with Non-Phantom Dynamical Dark Energy ($w(z)\ge -1$)
• Implications of an extended dark energy model with massive neutrinos
• No evidence for dynamical dark energy in two models
• First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
• Dynamic properties of cyclic cosmologies
• Constraints on power law cosmology from cosmic chronometer, standard ruler, and standard candle data
• Phantom Dirac-Born-Infeld Dark Energy