Year: 2013
Type: article
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 specific class of coupled quintessence models, characterized by a constant interaction parameter $ϵ$, 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 $\ensuremath{\Lambda}\mathrm{CDM}$ model ($ϵ=0$). We perform our analysis at two levels, namely, through Monte Carlo simulations based on $ϵ\mathrm{CDM}$ models, in which $H(z)$ samples with different accuracies are generated and through an analytic method that calculates the error propagation of $ϵ$ 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%.
Authors: P. C. Ferreira, J. C. Carvalho, J. S. Alcaniz
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2323193228