New proposal for non-linear ghost-free massive $F(R)$ gravity: cosmic acceleration and Hamiltonian analysis

TL;DR

This paper introduces a new ghost-free massive $F(R)$ gravity model, develops its Hamiltonian formulation, and demonstrates its potential to explain cosmic acceleration, including in the presence of cold dark matter.

Contribution

It presents a novel ghost-free massive $F(R)$ gravity theory, with a Hamiltonian analysis and cosmological implications, extending previous models.

Findings

The theory is shown to be ghost-free.

Cosmic acceleration is possible within this framework.

The model accommodates cold dark matter effects.

Abstract

We propose new version of massive $F(R)$ gravity which is natural generalization of convenient massive ghost-free gravity. Its Hamiltonian formulation in scalar-tensor frame is developed. We show that such $F(R)$ theory is ghost-free. The cosmological evolution of such theory is investigated. Despite the strong Bianchi identity constraint the possibility of cosmic acceleration (especially, in the presence of cold dark matter) is established. Ghost-free massive $F(R,T)$ gravity is also proposed.