Brans-Dicke theory


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Brans–Dicke theory

(branz dik) A relativistic theory of gravitation put forward in the 1960s by Carl Brans and Robert Dicke as a variant of Einstein's general theory of relativity. It is considered by many astronomers to be the most serious alternative to general relativity. It is a scalar-tensor theory, i.e. a theory in which the gravitational force on an object is due partly to the interaction with a scalar field and partly to a tensor interaction. Newton's gravitational constant is replaced by a slowly varying scalar field. The effect is to allow the strength of gravity to decrease with time. In the limit that this variation is zero, the various Brans–Dicke theories of gravitation that now exist reduce to Einstein's general relativity. Current observations limit the variation of Newton's gravitational constant to be less than one part in 1010 per year. This means that for local applications of a noncosmological nature Brans–Dicke theory is indistinguishable from general relativity.

Brans-Dicke theory

[¦bränz ¦dik ‚thē·ə·rē]
(relativity)
A theory of gravitation in which the gravitational field is described by the tensor field of general relativity and by a new scalar field, which is determined by the distribution of mass-energy in the universe and replaces the gravitational constant.
References in periodicals archive ?
When the author was reading a paper [19] about the Mach principle and Brans-Dicke theory of gravity to develop his electric redshift mechanism in accord with the five-dimensional fully covariant Kaluza-Klein theory with a scalar field [20], an idea that the universe is a black hole came to his mind [21].
The rest of the book is organized in sections on GRT, relativistic cosmology, and scalar-tensor theories, covering areas including Schwarzschild's metric and classical experimental tests, Brans-Dicke theory and cosmology, and cosmological lambda models.
The Brans-Dicke theory can be obtained setting [omega] = const and [lambda] = 0.