Birkhoff's theorem — An Etymological Dictionary of Astronomy and Astrophysics

Birkhoff's theorem

فربین ِ بیرکهوف

farbin-e Birkhoff

Fr.: théorème de Birkhoff

For a four dimensional → space-time, the → Schwarzschild metric is the only solution of → Einstein’s field equations which describes the gravitational field created by a spherically symmetrical distribution of mass. The theorem implies that the gravitational field outside a sphere is necessarily static, and that the metric inside a spherical shell of matter is necessarily flat.

See also: The theorem was first demonstrated in 1923 by George David Birkhoff (1884-1944), an American mathematician; → theorem

An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک