Massive gravitons dark matter scenario revisited

TL;DR

This paper revisits the massive graviton dark matter scenario, analyzing its evolution and interactions, and clarifies its behavior without phantom phases and its connection to cosmic acceleration.

Contribution

It provides a detailed reexamination of MGCDM, clarifying its equations of state and interaction effects, offering new insights into its viability as an alternative to dark energy.

Findings

No phantom phase in the evolution toward the past

Past acceleration arises from interaction between massive graviton and cold dark matter

Clarifies the behavior of native and effective equations of state

Abstract

We reexamine the massive graviton dark matter scenario (MGCDM) which was recently considered as an alternative to dark energy models. When introducing the native and effective equations of state (EoS), it is shown that there is no phantom phase in the evolution toward the far past. Also we show that the past accelerating phase arises from the interaction between massive graviton and cold dark matter.