Parameterized post Newtonian approximation in a teleparallel model of dark energy with a boundary term

TL;DR

This paper investigates how a non-minimally coupled scalar field in a teleparallel gravity model influences the parameterized post-Newtonian parameters, revealing the impact of boundary term coupling on gravitational predictions.

Contribution

It introduces a novel coupling of scalar fields to both scalar torsion and boundary terms in teleparallel gravity, analyzing their effects on PPN parameters.

Findings

Coupling to boundary term alters PPN parameters.

Different coupling scenarios produce distinct PPN parameter values.

The model's predictions differ from standard teleparallel gravity without boundary coupling.

Abstract

We study the parameterized post-Newtonian approximation in teleparallel model of gravity with a scalar field. The scalar field is non-minimally coupled to the scalar torsion as well as to the boundary term introduced in [1]. We show that, in contrast to the case where the scalar field is only coupled to the scalar torsion, the presence of the new coupling affects the parameterized post-Newtonian parameters. These parameters for different situations are obtained and discussed.