Cosmic acceleration via derivative matter couplings

TL;DR

This paper proposes a modified gravitational theory with derivative matter couplings that naturally explains late-time cosmic acceleration through an effective cosmological constant, aligning with observations and maintaining well-behaved limits.

Contribution

It introduces a new gravitational model with derivative matter couplings that achieves de Sitter expansion and an effective cosmological constant without exotic matter.

Findings

Achieves de Sitter expansion with baryonic matter

Maintains separate conservation of matter components

Well-behaved Newtonian limit

Abstract

A gravitational theory with derivative matter coupling is proposed which adopt de Sitter expansion at late times with ordinary baryonic matter. Matter components are conserved separately in the cosmological background and the Newtonian limit is well behaved. Also Conformal transformation of the theory to Jordan frame showing an effective cosmological constant explaining the nature of de Sitter acceleration.