Dilaton Gravity with a Non-minmally Coupled Scalar Field

TL;DR

This paper explores two-dimensional dilaton gravity coupled with a massless scalar field in an unusual way, presenting new solutions with black-hole characteristics and comparing them to existing models.

Contribution

It introduces novel forms of coupling between dilaton gravity and scalar fields and analyzes their black-hole solutions, expanding the understanding of such models.

Findings

New black-hole solutions with unusual couplings

Comparison with existing dilaton gravity models

Insights into scalar field effects on black-hole behavior

Abstract

We discuss the two-dimensional dilaton gravity with a scalar field as the source matter. The coupling between the gravity and the scalar, massless, field is presented in an unusual form. We work out two examples of these couplings and solutions with black-hole behaviour are discussed and compared with those found in the literature.