Probing interaction in the dark sector

Abstract

A phenomenological attempt at alleviating the so-called coincidence problem is to allow the dark matter and dark energy to interact. By assuming a coupled quintessence scenario characterized by an interaction parameter $\epsilon$, we investigate the precision in the measurements of the expansion rate $H(z)$ required by future experiments in order to detect a possible deviation from the standard $\Lambda$CDM model ($\epsilon =0$). We perform our analyses at two levels, namely: through Monte Carlo simulations based on $\epsilon$CDM models, in which $H(z)$ samples with different accuracies are generated and through an analytic method that calculates the error propagation of $\epsilon$ as a function of the error in $H(z)$. We show that our analytical approach traces simulations accurately and find that to detect an interaction {using $H(z)$ data only, these must reach an accuracy better than 1%.

4 pages, 3 figures, LaTeX

References in corpus (5)

• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Interacting models may be key to solve the cosmic coincidence problem
• Observational constraints on late-time Lambda(t) cosmology
• Coupled quintessence with a possible transient accelerating phase

Cited by in corpus (6)

• Echo of interactions in the dark sector
• Bayesian Comparison of Interacting Scenarios
• Bayesian comparison of nonstandard cosmologies using type Ia supernovae and BAO data
• Interacting Tsallis holographic dark energy: Cosmic behaviour, statefinder analysis and ${\omega }_D-{\omega }_D^{\prime }$ pair in the non-flat universe
• Observational constraints on dark energy cosmological model parameters
• On detecting interactions in the dark sector with H(z) data