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dynamical horizon
In theoretical physics, a dynamical horizon (DH) is a local description (i.e. independent of the global structure of the spacetime) of evolving black hole horizons. In literature there exists two different mathematical formulation of DHs—2+2 formulation developed by Sean Hayward and 3+1 formulation developed by Abhay Ashtekar and others (see ). It provides a description of a black hole that is evolving (e.g. one that has a non-zero mass-energy influx). A related formalism, for black holes with zero influx, is an isolated horizon.
==Formal definition==
The formal definition of a dynamical horizon is as follows:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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