Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-04-11
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex file, 9 pages, no figure. To appear in the "Prof. Jos\'e Pl\'{\i}nio Baptista Festschrift"
Scientific paper
We study Einstein gravity coupled to a massless scalar field in a static spherically symmetric space-time in four dimensions. Black hole solutions exist when the kinetic energy of the scalar field is negative, that is, for a phantom field. These ``scalar black holes'' have an infinite horizon area and zero temperature. They are related through a conformal transformation with similar objects in the Jordan frames of scalar-tensor theories of gravity. The thermodynamical properties of these solutions are discussed. It is proved that any \ssph \bhs with an infinite horizon area have zero Hawking temperature.
Bronnikov Kirill A.
Fabris Julio Cesar
Pinto-Neto Nelson
Rodrigues Manuel Eleuterio
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