Global properties of matter in collapsed state ("black holes")

1973 ◽  
Vol 111 (9) ◽  
pp. 3 ◽  
Author(s):  
M.A. Markov
Keyword(s):  
Black Holes ◽  
Global Properties

scholarly journals COLLAPSING SCALAR FIELD WITH KINEMATIC SELF-SIMILARITY OF THE SECOND KIND IN (2+1) GRAVITY

2005 ◽  
Vol 14 (06) ◽  
pp. 1049-1061 ◽  
Author(s):  
R. CHAN ◽  
M. F. A. DA SILVA ◽  
J. F. VILLAS DA ROCHA ◽  
ANZHONG WANG
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Gravitational Collapse ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Field Equations ◽  
Self Similarity ◽  
Global Properties ◽  
Scalar Field Equations

All the (2+1)-dimensional circularly symmetric solutions with kinematic self-similarity of the second kind to the Einstein-massless-scalar field equations are found and their local and global properties are studied. It is found that some of them represent gravitational collapse of a massless scalar field, in which black holes are always formed.

scholarly journals GRAVITATIONAL COLLAPSE OF MASSLESS SCALAR FIELD WITH NEGATIVE COSMOLOGICAL CONSTANT IN (2+1) DIMENSIONS

2006 ◽  
Vol 15 (04) ◽  
pp. 545-557 ◽  
Author(s):  
R. CHAN ◽  
M. F. A. DA SILVA ◽  
JAIME F. VILLAS DA ROCHA
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Cosmological Constant ◽  
Gravitational Collapse ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Field Equations ◽  
Negative Cosmological Constant ◽  
Global Properties ◽  
Scalar Field Equations

The (2+1)-dimensional geodesic circularly symmetric solutions of Einstein-massless-scalar field equations with negative cosmological constant are found and their local and global properties are studied. It is found that one of them represents gravitational collapse where black holes are always formed.

scholarly journals Global properties of dilatonic Gauss–Bonnet black holes

2005 ◽  
Vol 22 (16) ◽  
pp. 3169-3180 ◽  
Author(s):  
M Melis ◽  
S Mignemi
Keyword(s):  
Black Holes ◽  
Global Properties

scholarly journals GRAVITATIONAL COLLAPSE OF A MASSLESS SCALAR FIELD AND A PERFECT FLUID WITH SELF-SIMILARITY OF THE FIRST KIND IN 2+1 DIMENSIONS

2008 ◽  
Vol 17 (11) ◽  
pp. 2143-2158 ◽  
Author(s):  
F. I. M. PEREIRA ◽  
R. CHAN
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Perfect Fluid ◽  
Gravitational Collapse ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Self Similarity ◽  
Global Properties ◽  
Self Similar ◽  
Similar Solutions

Self-similar solutions of a collapsing perfect fluid and a massless scalar field with kinematic self-similarity of the first kind in 2+1 dimensions are obtained. The local and global properties of the solutions are studied. It is found that some of them represent gravitational collapse, in which black holes are always formed, and some may be interpreted as representing cosmological models.

GRAVITATIONAL COLLAPSE OF A MASSLESS SCALAR FIELD AND A PERFECT FLUID WITH SELF-SIMILARITY OF THE SECOND KIND IN (2 + 1) DIMENSIONS

2006 ◽  
Vol 15 (02) ◽  
pp. 131-152 ◽  
Author(s):  
F. I. M. PEREIRA ◽  
R. CHAN ◽  
AN ZHONG WANG
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Perfect Fluid ◽  
Gravitational Collapse ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Self Similarity ◽  
Global Properties ◽  
Self Similar ◽  
Similar Solutions

Self-similar solutions of a collapsing perfect fluid and a massless scalar field with kinematic self-similarity of the second kind in (2 + 1) dimensions are obtained. The local and global properties of the solutions are studied. It is found that some of them represent gravitational collapse, in which black holes are always formed, and some may be interpreted as representing cosmological models.

scholarly journals How to constrain mass and spin of supermassive black holes through their disk emission

2018 ◽  
Vol 612 ◽  
pp. A59 ◽  
Author(s):  
Samuele Campitiello ◽  
Gabriele Ghisellini ◽  
Tullia Sbarrato ◽  
Giorgio Calderone
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Numerical Model ◽  
Accretion Rate ◽  
High Redshift ◽  
Thin Disk ◽  
Analytic Approximation ◽  
Viewing Angle ◽  
Global Properties ◽  
Black Hole Masses

We investigate the global properties of the radiation emitted by the accretion disk around Kerr black holes. Using the Kerr blackbody numerical model, we build an analytic approximation of the disk emission features focusing on the pattern of the produced radiation as a function of the black hole spin, mass, accretion rate and viewing angle. The assumption of having a geometrically thin disk limits our analysis to systems emitting below ~0.3 of the Eddington luminosity. We apply this analytical model to four blazars (whose jets are pointing at us) at high redshift that show clear signatures of disk emission. For them, we derive the black hole masses as a function of spin. If these jetted sources are powered by the black hole rotation, they must have high spin values, further constraining their masses.

scholarly journals CLASSICAL ANALOG OF THE QUANTUM SCHWARZSCHILD BLACK HOLE: LOCAL VS GLOBAL, AND THE MYSTERY OF log 3

2011 ◽  
Vol 26 (01) ◽  
pp. 161-178
Author(s):  
VICTOR BEREZIN
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Event Horizon ◽  
Einstein Equations ◽  
Schwarzschild Black Hole ◽  
Quantum Black Hole ◽  
Classical Analog ◽  
Global Properties

A model is built in which the main global properties of classical and quasiclassical black holes become local. These are the event horizon, "no hair," temperature and entropy. The construction is based on the features of a quantum collapse, discovered when studying some quantum black hole models. But the model is purely classical, and this allows one to use self-consistently the Einstein equations and classical (local) thermodynamics and explain in this way the " log 3" puzzle.

DUAL DILATION DYONS

1991 ◽  
Vol 06 (29) ◽  
pp. 2677-2686 ◽  
Author(s):  
ALFRED SHAPERE ◽  
SANDIP TRIVEDI ◽  
FRANK WILCZEK
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Magnetic Charge ◽  
Tree Level ◽  
Duality Transformation ◽  
Global Properties ◽  
Different Types ◽  
Dimensional Black Hole ◽  
Causal Structures ◽  
Black Hole Solutions

We find four-dimensional black hole solutions of the tree-level string effective action, that carry both electric and magnetic charge. The solutions involve non-trivial axion and dilaton fields, and are related to one another by a form of duality transformation. These black holes have drastically different global properties from the usual charged holes without axions and dilatons. The global causal structures of the effective metrics seen by different types of particles (for the same solution) can differ.

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