Instability in interacting dark sector: An appropriate Holographic Ricci dark energy model

Abstract

In this paper we investigate the consequences of phantom crossing considering the perturbative dynamics in models with interaction in their dark sector. By mean of a general study of gauge-invariant variables in comoving gauge, we relate the sources of instabilities in the structure formation process with the phantom crossing. In order to illustrate these relations and its consequences in more detail, we consider a specific case of an holographic dark energy interacting with dark matter. We find that in spite of the model is in excellent agreement with observational data at background level, however it is plagued of instabilities in its perturbative dynamics. We reconstruct the model in order to avoid these undesirable instabilities, and we show that this implies a modification of the concordance model at background. Also we find drastic changes on the parameters space in our model when instabilities are avoided.

32 pages, 6 figures. Minor corrections, references added, accepted in JCAP

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Cited by in corpus (4)

• Fractional dark energy
• A note on interacting holographic dark energy with a Hubble-scale cutoff
• Constraints on interacting dark energy revisited: implications for the Hubble tension
• Ricci-Cubic Holographic Dark Energy: Confronting Observations, Stability and the Cosmic Coincidence Problem