Dilaton Gravity with a Non-minimally Coupled Scalar Field

Cern-th/95-259 Dilaton Gravity with a Non-minimally Coupled Scalar Field

A Solvable Model of Two-Dimensional Dilaton-Gravity Coupled to a Massless Scalar Field

We present a solvable model of two-dimensional dilaton-gravity coupled to a massless scalar field. We locally integrate the field equations and briefly discuss the properties of the solutions. For a particular choice of the coupling between the dilaton and the scalar field the model can be interpreted as the two-dimensional effective theory of 2+1 cylindrical gravity minimally coupled to a mass...

Scalar Hair Theorem for a Charged Spherical Black Hole

This paper shows that no scalar hair can exist for a spherically symmetric charged black hole. This is true for minimally as well as non-minimally coupled scalar fields. If, however, the scalar field is coupled nonminimally to the matter lagrangian also, nontrivial scalar hair may exist. One example of the latter may be found in dilaton gravity.

Conformal Anomaly in 4D Gravity-Matter Theories Non-minimally Coupled with Dilaton

Abstract The conformal anomaly for 4D gravity-matter theories, which are non-minimally coupled with the dilaton, is systematically studied. Special care is taken for: rescaling of fields, treatment of total derivatives, hermiticity of the system operator and choice of measure. Scalar, spinor and vector fields are taken as the matter quantum fields and their explicit conformal anomalies in the g...

If-ufrj/99 Hawking Radiation in the Dilaton Gravity with a Non-minimally Coupled Scalar Field

We discuss the two-dimensional dilaton gravity with a scalar field as the source matter where the coupling with gravity is given, besides the minimal one, through an external field. This coupling generalizes the conformal anomaly in the same way as those found in recent literature, but with a diferent motivation. The modification to the Hawking radiation is calculated explicity and show an addi...