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Scalar theories of gravitation
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Scalar theories of gravitation : ウィキペディア英語版
Scalar theories of gravitation
Scalar theories of gravitation are field theories of gravitation in which the gravitational field is described using a scalar field, which is required to satisfy some field equation.
''Note:'' This article focuses on relativistic classical field theories of gravitation. The best known relativistic classical field theory of gravitation, general relativity, is a tensor theory, in which the gravitational interaction is described using a tensor field.
== Newtonian gravity ==

The prototypical scalar theory of gravitation is Newtonian gravitation. In this theory, the gravitational interaction is completely described by the potential \Phi, which is required to satisfy the Poisson equation (with the mass density acting as the source of the field). To wit:
\Delta \Phi = 4 \pi G \rho, where
* ''G'' is the gravitational constant and
* \rho is the mass density.
This field theory formulation leads directly to the familiar law of universal gravitation, F = m_1 m_2 G/r^2.

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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