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Signature of the interaction between dark energy and dark matter in galaxy clusters

E. Abdalla, L. R. Abramo, L. Sodre, B. Wang

Abstract

We investigate the influence of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. We obtain the general Layser-Irvine equation in the presence of interactions, and find how, in that case, the virial theorem stands corrected. Using optical, X-ray and weak lensing data from 33 relaxed galaxy clusters, we put constraints on the strength of the coupling in the dark sector. We find that this coupling is small but positive, indicating that dark energy can be decaying into dark matter.

Signature of the interaction between dark energy and dark matter in galaxy clusters

Abstract

We investigate the influence of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. We obtain the general Layser-Irvine equation in the presence of interactions, and find how, in that case, the virial theorem stands corrected. Using optical, X-ray and weak lensing data from 33 relaxed galaxy clusters, we put constraints on the strength of the coupling in the dark sector. We find that this coupling is small but positive, indicating that dark energy can be decaying into dark matter.

Paper Structure

This paper contains 5 sections, 14 equations, 1 figure.

Table of Contents

  1. Introduction
  2. PHENOMENOLOGY OF COUPLED DARK ENERGY AND DARK MATTER MODELS
  3. LAYZER-IRVINE EQUATION IN THE PRESENCE OF COUPLING
  4. MASS ESTIMATION AND LIMITS ON THE COUPLING
  5. CONCLUSIONS

Figures (1)

  • Figure 1: Normalized probability distribution functions for the tests $f_1$ (top panel), $f_2$ (middle panel) and $f_3$ (bottom panel.) The shadowed regions on the top and middle panels indicate the 67% and 95% C.L. limits.