Reconstruction of the dark matter-vacuum energy interaction

Yuting Wang*, Gong Bo Zhao, David Wands, Levon Pogosian, Robert G. Crittenden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

An interaction between the vacuum energy and dark matter is an intriguing possibility which may offer a way of solving the cosmological constant problem. Adopting a general prescription for momentum exchange between the two dark components, we reconstruct α(a), the temporal evolution of the coupling strength between dark matter and vacuum energy, in a nonparametric Bayesian approach using combined observational data sets from the cosmic microwave background, supernovae and large scale structure. An evolving interaction between the vacuum energy and dark matter removes some of the tensions between different data sets. However, it is not preferred over ΛCDM in the Bayesian sense, as improvement in the fit is not sufficient to compensate for the increase in the volume of the parameter space.

Original languageEnglish
Article number103005
JournalPhysical Review D
Volume92
Issue number10
DOIs
Publication statusPublished - 30 Nov 2015

Keywords

  • RCUK
  • STFC
  • ST/H002774/1
  • ST/L005573/1

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