A horizon is a boundary in spacetime satisfying prescribed conditions. There are several types of horizons that play a role in Albert Einstein's theory of general relativity:
* Absolute horizon, a boundary in spacetime in general relativity inside of which events cannot affect an external observer
* Event horizon, a boundary in spacetime beyond which events cannot affect the observer, thus referring to a black hole's boundary and the boundary of an expanding universe
* Apparent horizon, a surface defined in general relativity
* Cauchy horizon, a surface found in the study of Cauchy problems
* Cosmological horizon, a limit of observability
* Killing horizon, a null surface on which there is a Killing vector field
* Particle horizon, the maximum distance from which particles can have
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| - Horizon (trou noir) (fr)
- Horizon (general relativity) (en)
- 视界 (zh)
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| - A horizon is a boundary in spacetime satisfying prescribed conditions. There are several types of horizons that play a role in Albert Einstein's theory of general relativity:
* Absolute horizon, a boundary in spacetime in general relativity inside of which events cannot affect an external observer
* Event horizon, a boundary in spacetime beyond which events cannot affect the observer, thus referring to a black hole's boundary and the boundary of an expanding universe
* Apparent horizon, a surface defined in general relativity
* Cauchy horizon, a surface found in the study of Cauchy problems
* Cosmological horizon, a limit of observability
* Killing horizon, a null surface on which there is a Killing vector field
* Particle horizon, the maximum distance from which particles can have (en)
- En astrophysique, l'horizon d'un trou noir, ou l'horizon des évènements (event horizon en anglais), représente la frontière d'un trou noir à partir de laquelle la vitesse de libération atteint celle de la lumière. Selon le type de trou noir concerné, la taille et la forme de l'horizon seraient variables. Elles seraient en grande partie déterminées par la masse et par le moment cinétique du trou noir. (fr)
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| - A horizon is a boundary in spacetime satisfying prescribed conditions. There are several types of horizons that play a role in Albert Einstein's theory of general relativity:
* Absolute horizon, a boundary in spacetime in general relativity inside of which events cannot affect an external observer
* Event horizon, a boundary in spacetime beyond which events cannot affect the observer, thus referring to a black hole's boundary and the boundary of an expanding universe
* Apparent horizon, a surface defined in general relativity
* Cauchy horizon, a surface found in the study of Cauchy problems
* Cosmological horizon, a limit of observability
* Killing horizon, a null surface on which there is a Killing vector field
* Particle horizon, the maximum distance from which particles can have travelled to an observer in the age of the universe (en)
- En astrophysique, l'horizon d'un trou noir, ou l'horizon des évènements (event horizon en anglais), représente la frontière d'un trou noir à partir de laquelle la vitesse de libération atteint celle de la lumière. Selon le type de trou noir concerné, la taille et la forme de l'horizon seraient variables. Elles seraient en grande partie déterminées par la masse et par le moment cinétique du trou noir. L'horizon des évènements est une hypersurface de genre lumière. Il représente la limite de l'extension spatiale du trou noir, définissant ce qui peut être considéré comme étant sa taille. La région délimitée par l'horizon des évènements diffère ainsi de la singularité gravitationnelle centrale, qui serait d'un rayon nul et d'une densité infinie. Le théorème de Hawking sur la topologie des trous noirs affirme que, dans l'espace-temps à quatre dimensions, asymptotiquement plat et obéissant à la condition d'énergie dominante, l'horizon des évènements d'un trou noir stationnaire a la topologie d'une 2-sphère. (fr)
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