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Event Horizon

In solutions to General Relativity, an event horizon is a boundary in space-time defined with respect to an observer, beyond which events in the vicinity of a space-time singularity cannot affect the observer. Conversely, anything that passes through the event horizon can never communicate with the outside universe or escape from its vicinity.

There are two types of horizons surrounding space-time black holes, designated as absolute and apparent horizons, which may be classified as isolated or dynamic horizons in current black hole research. In the context of black holes, the term event horizon refers to the absolute horizon as opposed to the apparent horizon.

When GR is combined with quantum mechanics, such as in Relativistic Quantum Field Theory [RQFT] - the Standard Model of physics - event horizons will have a temperature and emit radiation. For black holes this is called Hawking radiation and is part of the subject of black hole thermodynamics, including gravitational entropy.

Web Resources On Event Horizon

Event horizon
Anatomy of a Black Hole
Event Horizon

Book Resources On Event Horizon

The Einstein Equations and the Large Scale Behavior of Gravitational Fields: 50 Years of the Cauchy Problem in General Relativity by Piotr T. Chrusciel and Helmut Friedrich, Eds.
Death by Black Hole: And Other Cosmic Quandries by Neil deGrasse Tyson

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