On exotic objects made of dark energy and dark matter: Mass-to-radius profiles and tidal Love numbers

TL;DR

This paper explores the structural and tidal properties of exotic spherical objects composed of dark matter and dark energy using specific equations of state, providing insights into their mass, radius, and deformability characteristics.

Contribution

It introduces a detailed analysis of dark matter and dark energy mixed objects using the 2-fluid formalism and computes their physical and tidal properties for the first time.

Findings

Mass-to-radius profiles vary with different equations of state.

Tidal Love numbers differ significantly between single fluid and 2-fluid configurations.

Compactness and deformability metrics are characterized for these exotic objects.

Abstract

We investigate some properties of exotic spherical configurations made of dark matter and dark energy. For the former we adopt a polytropic equation-of-state, while for the latter we adopt the Extended Chaplygin gas equation-of-state. Solving the Tolman-Oppenheimer-Volkoff equations, within the 2-fluid formalism, we compute the factor of compactness, the mass-to-radius relationships, as well as the tidal Love numbers and dimensionless deformabilities. A comparison between single fluid objects and 2-fluid configurations is made as well.