The Effect of Interacting Dark Energy on Mass-Temperature Relation in Galaxy Clusters

TL;DR

This paper investigates how interactions between dark matter and dark energy influence the mass-temperature relation in galaxy clusters, deriving a modified virial theorem and testing it against observational data to constrain interaction parameters.

Contribution

It derives a modified virial theorem for five interacting dark energy models and applies it to galaxy clusters, providing new constraints on interaction constants based on observational data.

Findings

Interaction affects the normalization of the mass-temperature relation

Energy transfer occurs from dark matter to dark energy in studied models

Derived constraints on interaction constants consistent with observations

Abstract

There are a variety of cosmological models for dark matter and dark energy in which a possible interaction is considered between these two significant components of the universe. We focus on five suggested models of interacting dark matter and dark energy and derive the modified virial theorem for them by developing a previous approach. It provides an opportunity to study the evolution of this modified virial theorem with time and interacting constants for different interacting models. Then we use this obtained virial condition to investigate the modified mass-temperature relation in galaxy clusters via three various methods. It reveals that the effect of interaction between dark matter and dark energy merely appears in the normalization factor of $M\propto T^{\frac{3}{2}}$. This relation also leads to a new constraint on the constants of interacting models, which only depends on the concentration parameter and density profile of the cluster. Then we use five observational data sets to check some proposed figures for the constants of interaction which have been resulted from other observational constraints. Finally, by fitting the observational results to the modified mass-temperature relation, we obtain values for interacting constants of three models and four specific cases of the two remained models. In agreement with many other observational outcomes, we find that according to observational data for masses and temperatures of the galaxy clusters, energy transfer occurs from dark matter to dark energy in the seven investigated models.