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42 results on '"Apparent horizon"'

2. Black Hole Formation in High Energy Particle Collisions

Author

Calmet, Xavier, Carr, Bernard, Winstanley, Elizabeth, Babaev, Egor, Series editor, Bremer, Malcolm, Series editor, Calmet, Xavier, Series editor, Di Lodovico, Francesca, Series editor, Hoogerland, Maarten, Series editor, Le Ru, Eric, Series editor, Lewerenz, Hans-Joachim, Series editor, Overduin, James, Series editor, Petkov, Vesselin, Series editor, Wang, Charles H.-T., Series editor, Whitaker, Andrew, Series editor, Carr, Bernard, and Winstanley, Elizabeth

Published
2014
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10. Black Hole Simulations

Author

Bona, Carles, Bona-Casas, Carles, Palenzuela-Luque, Carlos, Bona, Carles, Palenzuela-Luque, Carlos, and Bona-Casas, Carles

Published
2009
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11. Numerical Simulations of Black Hole Formation

Author

Stergioulas, N., Beiglböck, Wolf, editor, Ehlers, Jürgen, editor, Hepp, Klaus, editor, Weidenmüller, Hans A., editor, Beig, R., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Guinea, F., editor, Hänggi, P., editor, Hillebrandt, W., editor, Jaffe, R. L., editor, Janke, W., editor, Löhneysen, H. von, editor, Mangano, M., editor, Raimond, J.-M., editor, Sornette, D., editor, Theisen, S., editor, Vollhardt, D., editor, Weise, W., editor, Zittartz, J., editor, and Papantonopoulos, Eleftherios, editor

Published
2009
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13. Effective Horizons in the Laboratory

Author

Schützhold, R., Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Unruh, William G., editor, and Schützhold, Ralf, editor

Published
2007
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15. Recent Analytical and Numerical Techniques Applied to the Einstein Equations

Author

Neilsen, Dave, Lehner, Luis, Sarbach, Olivier, Tiglio, Manuel, Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Frauendiener, Jörg, editor, Giulini, Domenico J.W., editor, and Perlick, Volker, editor

Published
2006
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17. Black Hole Simulations

Author

Bona, Carles, Palenzuela-Luque, Carlos, Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Bona, Carles, and Palenzuela-Luque, Carlos

Published
2005
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18. The Positive Mass Theorem

Author

Straumann, Norbert, Balian, R., editor, Beiglböck, W., editor, Grosse, H., editor, Lieb, E. H., editor, Reshetikhin, N., editor, Spohn, H., editor, Thirring, W., editor, and Straumann, Norbert

Published
2004
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19. Quantum Theory of Gravitational Collapse (Lecture Notes on Quantum Conchology)

Author

Hájíček, Petr, Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v. Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Giulini, Domenico J. W., editor, Kiefer, Claus, editor, and Lämmerzahl, Claus, editor

Published
2003
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20. Gauge Conditions for Long-Term Numerical Black Hole Evolution With or Without Excision

Author

Alcubierre, Miguel, Brügmann, Bernd, Pollney, Denis, Seidel, Edward, Takahashi, Ryoji, Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Fernández-Jambrina, Leonardo, editor, and González-Romero, Luis Manuel, editor

Published
2003
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21. Introduction

Author

Mersini-Houghton, Laura, Vaas, Rüdiger, Mersini-Houghton, Laura, editor, and Vaas, Rudy, editor

Published
2012
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22. Black Holes

Author

Chruściel, Piotr T., Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v. Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Frauendiener, Jörg, editor, and Friedrich, Helmut, editor

Published
2002
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23. Problems and Successes in the Numerical Approach to the Conformal Field Equations

Author

Husa, Sascha, Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v. Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Frauendiener, Jörg, editor, and Friedrich, Helmut, editor

Published
2002
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24. On the Construction of Time-Symmetric Black Hole Initial Data

Author

Giulini, Domenico, Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R.L., editor, Kippenhahn, R., editor, Ojima, I., editor, Weidenmüller, H.A., editor, Wess, J., editor, Zittartz, J., editor, Hehl, Friedrich W., editor, Kiefer, Claus, editor, and Metzler, Ralph J.K., editor

Published
1998
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26. Naturalness of inflation

Author

Maeda, Kei-ichi, Araki, H., editor, Brézin, E., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, and Occhionero, Franco, editor

Published
1995
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28. Canonical quantization and cosmic censorship

Author

Hajicek, P., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, de Vega, H. J., editor, and Sánchez, N., editor

Published
1986
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33. A Brief Review of Relativistic Gravitational Collapse

Author

Daniele Malafarina

Subjects
Condensed Matter::Quantum Gases, Physics, Event horizon, General relativity, Collapse (topology), Mechanics, Black hole, symbols.namesake, Classical mechanics, Apparent horizon, Gravitational collapse, symbols, Stress–energy tensor, Einstein
Abstract

We review here the basic setup to describe complete gravitational collapse of massive bodies within the general theory of relativity. We derive Einstein’s equations describing collapse and solve them in some simple well-known toy models. We study the final outcome of collapse and the quantities that describe the formation of trapped surfaces and of the central singularity.

Published
2016

34. Black Hole Formation in High Energy Particle Collisions

Author

Elizabeth Winstanley, Xavier Calmet, and Bernard Carr

Subjects
Surface (mathematics), Physics, Black hole, Particle physics, High energy particle, Black hole formation, Apparent horizon, Gravitational collapse, Trapped surface, Atomic physics, Collision
Abstract

In this chapter we describe how black holes form in the high energy collision of two particles. The challenge lies in establishing that a closed trapped surface forms during that collision. Remarkably, it is possible to construct such a surface analytically for a \(3+1\) dimensional space-time. This construction can be extended into the semi-classical regime.

Published
2013

35. Radiation from a D-Dimensional Collision of Shock Waves: A Summary of the First Order Results

Author

Carmen Rebelo, Flávio S. Coelho, Marco O. P. Sampaio, and Carlos A. R. Herdeiro

Subjects
Physics, Black hole, Shock wave, Gravitational wave, Apparent horizon, Quantum electrodynamics, Computation, Metric (mathematics), Radiation, Collision
Abstract

We describe how to set up a perturbative framework to compute the metric in the future of a D-dimensional collision of two high speed black holes, by superimposing two equal Aichelburg–Sexl shock waves traveling, head-on, in opposite directions. We then estimate the radiation emitted in the collision using a D-dimensional generalisation of the Landau–Lifschitz pseudo-tensor—workable in a first order approach—and compute the percentage of the initial centre of mass energy emitted as gravitational waves. We shall see that our first order results are always within the bound obtained from apparent horizons computations.

Published
2013

36. Radiation from a D-Dimensional Collision of Shock Waves: Numerics and a Charged Case

Author

Carmen Rebelo, Carlos A. R. Herdeiro, Flávio S. Coelho, and Marco O. P. Sampaio

Subjects
Shock wave, Gravitation, Physics, Classical mechanics, Gravitational wave, Apparent horizon, Perturbation theory (quantum mechanics), Tensor, Axial symmetry, Collision
Abstract

We describe the generalisation to higher orders, of a perturbative framework to find the metric after the collision of two Aichelburg–Sexl gravitational shock waves in D-dimensions. A central challenge is to estimate the amount of gravitational radiation emitted in the collision, at higher orders. We present an adaptation of the Bondi mass loss formula in D-dimensions which is valid non-perturbatively, for axially symmetric asymptotically flat space-times. This is shown to coincide with the Landau–Lifshitz pseudo tensor result at first order in perturbation theory. We also discuss the validity of the method with a collision of charged shocks.

Published
2013

37. Black Hole Simulations

Author

Carles Bona, Carles Bona-Casas, and Carlos Palenzuela-Luque

Subjects
Black hole, Physics, Numerical relativity, Binary black hole, Quantum mechanics, Apparent horizon, Extremal black hole, Black star
Published
2009

38. Naturalness of inflation

Author

Keiichi Maeda

Subjects
Black hole, Inflation (cosmology), Physics, Naturalness, Apparent horizon, Cosmic censorship hypothesis, Naked singularity, Astrophysics, Cosmological constant
Published
2008

39. Effective Horizons in the Laboratory

Author

R. Schützhold

Subjects
Quantum phase transition, Black hole, Physics, Quantum electrodynamics, Apparent horizon, Quantum mechanics, Superradiance, Particle horizon
Published
2007

40. Gravitational Collapse and Neutrino Emission of Population III Massive Stars

Author

Shoichi Yamada, Ken'ichiro Nakazato, and Kohsuke Sumiyoshi

Subjects
Physics, education.field_of_study, Stellar mass, Star formation, Population, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Outer core, Stars, Apparent horizon, Gravitational collapse, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Neutrino, education, Astrophysics::Galaxy Astrophysics
Abstract

Population III (Pop III) stars are the first stars in the universe. They do not contain metals, and their formation and evolution may be different from that of stars of later generations. In fact, according to the theory of star formation, Pop III stars might have very massive components (~100-10000 M☉). In this paper, we compute the spherically symmetric gravitational collapse of these Pop III massive stars. We solve the general relativistic hydrodynamics and neutrino transfer equations simultaneously, treating neutrino reactions in detail. Unlike supermassive stars (105 M☉), the stars of concern in this paper become opaque to neutrinos. The collapse is simulated until after an apparent horizon is formed. We confirm that the neutrino transfer plays a crucial role in the dynamics of gravitational collapse and find also that the β-equilibration leads to a somewhat unfamiliar evolution of electron fraction. Contrary to the naive expectation, the neutrino spectrum does not become harder for more massive stars. This is mainly because the neutrino cooling is more efficient and the outer core is more massive as the stellar mass increases. Here the outer core is the outer part of the iron core falling supersonically. We also evaluate the flux of relic neutrinos from Pop III massive stars. As expected, the detection of these neutrinos is difficult for the currently operating detectors. However, if ever observed, the spectrum will enable us to obtain information on the formation history of Pop III stars. We investigate 18 models covering the mass range of 300-104 M☉, making this study the most detailed numerical exploration of spherically symmetric gravitational collapse of Pop III massive stars. This will also serve as an important foundation for multidimensional investigations.

Published
2007

41. Canonical quantization and cosmic censorship

Author

P. Hajicek

Subjects
Black hole, Physics, Theoretical physics, Canonical quantization, Event horizon, Apparent horizon, Quantum mechanics, Cosmic censorship hypothesis, Causal structure
Published
1988

42. Solitons in General Relativity and Supergravity

Author

Gary W. Gibbons

Subjects
Physics, Theory of relativity, General relativity, Quantum mechanics, Apparent horizon, Supergravity, Equations of motion, Higher-dimensional supergravity, Soliton, Special relativity (alternative formulations), Mathematical physics
Abstract

In flat space physics we expect of a soliton or in Coleman’s famous phrase a “classical lump” that it be a a) time independent (static or stationary) b) finite (positive) energy c) non-singular d) classically and semi-classically stable solution of the classical equations of motion which frequently e) spatially interpolates between different vacua.

Published
1985

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