Spherically symmetric systems of fields and black holes. V. Predynamical properties of causal structure

1985 ◽  
Vol 31 (10) ◽  
pp. 2452-2458 ◽  
Author(s):  
P. Hajicek
Keyword(s):  
Black Holes ◽  
Causal Structure ◽  
Spherically Symmetric ◽  
Symmetric Systems

scholarly journals SPHERICALLY SYMMETRIC TRAPPING HORIZONS, THE MISNER–SHARP MASS AND BLACK HOLE EVAPORATION

2009 ◽  
Vol 24 (28n29) ◽  
pp. 5261-5285 ◽  
Author(s):  
ALEX B. NIELSEN ◽  
DONG-HAN YEOM
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Causal Structure ◽  
Information Loss ◽  
Black Hole Thermodynamics ◽  
Spherically Symmetric ◽  
Mixed States ◽  
Unitary Evolution ◽  
Event Horizons ◽  
Trapping Horizons

We discuss some of the issues relating to information loss and black hole thermodynamics in the light of recent work on local black hole horizons. Understood in terms of pure states evolving into mixed states, the possibility of information loss in black holes is closely related to the global causal structure of space–time, as is the existence of event horizons. However, black holes need not be defined by event horizons, and in fact we argue that in order to have a fully unitary evolution for black holes, they should be defined in terms of something else, such as a trapping horizon. The Misner–Sharp mass in spherical symmetry shows very simply how trapping horizons can give rise to black hole thermodynamics, Hawking radiation and singularities. We show how the Misner–Sharp mass can also be used to give insights into the process of collapse and evaporation of locally defined black holes.

scholarly journals ELECTRICALLY CHARGED COLD BLACK HOLES IN SCALAR-TENSOR THEORIES

1999 ◽  
Vol 08 (04) ◽  
pp. 481-505 ◽  
Author(s):  
K. A. BRONNIKOV ◽  
C. P. CONSTANTINIDIS ◽  
R. L. EVANGELISTA ◽  
J. C. FABRIS
Keyword(s):  
Black Holes ◽  
Proper Time ◽  
Causal Structure ◽  
Kinetic Term ◽  
Spherically Symmetric ◽  
Four Dimensions ◽  
Charged Black Holes ◽  
The Stability ◽  
Electrically Charged ◽  
Special Case

We study the possible existence of charged black holes in the Bergmann–Wagoner class of scalar-tensor theories (STT) of gravity in four dimensions. The existence of black holes is shown for anomalous versions of these theories, with a negative kinetic term in the Lagrangian. The Hawking temperature T H of these holes is zero, while the horizon area is (in most cases) infinite. As a special case, the Brans–Dicke theory is studied in more detail, and two kinds of infinite-area black holes are revealed, with finite and infinite proper time needed for an infalling particle to reach the horizon; among them, analyticity properties select a discrete subfamily of solutions, parametrized by two integers, which admit an extension beyond the horizon. The causal structure and stability of these solutions with respect to small radial perturbations is discussed. As a by-product, the stability properties of all spherically symmetric electrovacuum STT solutions are outlined.

Perturbations of spherically symmetric black holes

1980 ◽  
Vol 77 (1) ◽  
pp. 7-8
Author(s):  
Basilis C. Xanthopoulos
Keyword(s):  
Black Holes ◽  
Spherically Symmetric
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