Constraints on coupling constant between dark energy and dark matter

TL;DR

This paper explores the constraints on the interaction strength between dark energy modeled as Chaplygin gas and dark matter, revealing that the coupling constant can vary freely, with implications for phantom energy existence.

Contribution

It demonstrates that the coupling constant between dark matter and Chaplygin gas is unrestricted, challenging previous restrictions and exploring conditions for phantom energy.

Findings

Coupling constant can be positive or negative, with no strict bounds.

Restrictions like 0<c<1 are special cases, not general.

Supports the possibility of phantom energy under certain conditions.

Abstract

We have investigated constraints on the coupling between dark matter and the interacting Chaplygin gas. Our results indicate that the coupling constant $c$ between these two entities can take arbitrary values, which can be either positive or negative, thus giving arbitrary freedom to the inter-conversion between Chaplygin gas and dark matter. Thus our results indicate that the restriction $0<c<1$ on the coupling constant occurs as a very special case. Our analysis also supports the existence of phantom energy under certain conditions on the coupling constant.