About: Isolated horizon

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It was customary to represent via stationary solutions of field equations, i.e., solutions which admit a time-translational Killing vector field everywhere, not just in a small neighborhood of the black hole. While this simple idealization was natural as a starting point, it is overly restrictive. Physically, it should be sufficient to impose boundary conditions at the horizon which ensure only that the black hole itself is isolated. That is, it should suffice to demand only that the intrinsic geometry of the horizon be time independent, whereas the geometry outside may be dynamical and admit gravitational and other radiation.

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rdfs:label	Isolated horizon (en)
rdfs:comment	It was customary to represent via stationary solutions of field equations, i.e., solutions which admit a time-translational Killing vector field everywhere, not just in a small neighborhood of the black hole. While this simple idealization was natural as a starting point, it is overly restrictive. Physically, it should be sufficient to impose boundary conditions at the horizon which ensure only that the black hole itself is isolated. That is, it should suffice to demand only that the intrinsic geometry of the horizon be time independent, whereas the geometry outside may be dynamical and admit gravitational and other radiation. (en)
rdfs:seeAlso	Non-expanding horizon
dcterms:subject	Black holes General relativity
Wikipage page ID	36956239 (xsd:integer)
Wikipage revision ID	988995228 (xsd:integer)
Link from a Wikipage to another Wikipage	Black hole Non-expanding horizon Gravitational wave Submanifold Optical scalars Stereographic projection Stress–energy tensor Event horizons Causal structure Flux Geodesic (general relativity) Isothermal coordinates Black holes General relativity Charge (physics) Black hole thermodynamics Newman–Penrose formalism Null hypersurface Surface gravity Killing vector Black hole mechanics dbr:Outgoing_expansion_rate dbr:Weakly_isolated_horizon dbr:Black_hole_horizon
sameAs	Isolated horizon Isolated horizon Isolated horizon Isolated horizon
dbp:wikiPageUsesTemplate	dbt:Reflist dbt:See_also
has abstract	It was customary to represent via stationary solutions of field equations, i.e., solutions which admit a time-translational Killing vector field everywhere, not just in a small neighborhood of the black hole. While this simple idealization was natural as a starting point, it is overly restrictive. Physically, it should be sufficient to impose boundary conditions at the horizon which ensure only that the black hole itself is isolated. That is, it should suffice to demand only that the intrinsic geometry of the horizon be time independent, whereas the geometry outside may be dynamical and admit gravitational and other radiation. An advantage of isolated horizons over event horizons is that while one needs the entire spacetime history to locate an event horizon, isolated horizons are defined using local spacetime structures only. The laws of black hole mechanics, initially proved for event horizons, are generalized to isolated horizons. An isolated horizon refers to the quasilocal definition of a black hole which is in equilibrium with its exterior, and both the intrinsic and extrinsic structures of an isolated horizon (IH) are preserved by the null equivalence class . The concept of IHs is developed based on the ideas of non-expanding horizons (NEHs) and (WIHs): A NEH is a null surface whose intrinsic structure is preserved and constitutes the geometric prototype of WIHs and IHs, while a WIH is a NEH with a well-defined surface gravity and based on which the black-hole mechanics can be quasilocally generalized. (en)
prov:wasDerivedFrom	wikipedia-en:Isolated_horizon?oldid=988995228&ns=0
page length (characters) of wiki page	10735 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Isolated_horizon
is Link from a Wikipage to another Wikipage of	Non-expanding horizon Dynamical horizon Immirzi parameter Event horizon Isolated horizons
is Wikipage redirect of	Isolated horizons
is foaf:primaryTopic of	wikipedia-en:Isolated_horizon

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