Dark energy and dark matter from nonlocal ghost-free gravity theory

TL;DR

This paper introduces a class of nonlocal ghost-free gravity models that can produce de Sitter or Anti-de Sitter backgrounds, simulate dark matter, and transition between general relativity and strongly coupled infrared phases.

Contribution

It proposes a novel nonlocal gravity framework that is ghost-free, capable of generating various cosmological backgrounds, and includes a mechanism for dark matter simulation.

Findings

Models generate de Sitter and Anti-de Sitter backgrounds with arbitrary cosmological constants.

They interpolate between Einstein gravity and infrared strongly coupled phases.

The models feature two propagating massless graviton modes.

Abstract

We suggest a class of generally covariant ghost-free nonlocal gravity models generating de Sitter or Anti-de Sitter background with an arbitrary value of the effective cosmological constant and featuring a mechanism of dark matter simulation. These models interpolate between the general relativistic phase on a flat spacetime background and their strongly coupled infrared (Anti)-de Sitter phase with two propagating massless graviton modes.