Brans-Dicke cosmological exact solution in a radiation-filled Robertson-Walker universe

Singh, Risha; Deo, S. D.

doi:10.1007/bf00669419

Int J Theor Phys

1987

DOI: 10.1007/bf00669419

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Brans-Dicke cosmological exact solution in a radiation-filled Robertson-Walker universe

Risha Singh

S. D. Deo

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Cited by 4 publications

(2 citation statements)

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“…The O'Hanlon-Tupper solution for ω = − 3 2 is identical to the cosmological model found by Singh and Shridhar for a radiation-filled Robertson-Walker universe[26].…”

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confidence: 79%

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General relativity and Weyl geometry

Romero

Fonseca‐Neto

Pucheu

2012

Class. Quantum Grav.

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We show that the general theory of relativity may be formulated in the language of Weyl geometry. We develop the concept of Weyl frames and point out that the new mathematical formalism may lead to different pictures of the same gravitational phenomena. We show that in an arbitrary Weyl frame general relativity, which takes the form of a scalar-tensor gravitational theory, is invariant with respect to Weyl tranformations. A kew point in the development of the formalism is to build an action that is manifestly invariant with respect to Weyl transformations. When this action is expressed in terms of Riemannian geometry we find that the theory has some similarities with Brans-Dicke gravitational theory. In this scenario, the gravitational field is not described by the metric tensor only, but by a combination of both the metric and a geometrical scalar field. We illustrate this point by, firstly, discussing the Newtonian limit in an arbitrary frame, and, secondly, by examining how distinct geometrical and physical pictures of the same phenomena may arise in different frames. To give an example, we discuss the gravitational spectral shift as viewed in a general Weyl frame. We further explore the analogy of general relativity with scalar-tensor theories and show how a known Brans-Dicke vacuum solution may appear as a solution of general relativity theory when reinterpreted in a particular Weyl frame. Finally, we show that the so-called WIST gravity theories are mathematically equivalent to Brans-Dicke theory when viewed in a particular frame.

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“…The O'Hanlon-Tupper solution for ω = − 3 2 is identical to the cosmological model found by Singh and Shridhar for a radiation-filled Robertson-Walker universe[26].…”

supporting

confidence: 79%

“…It is straightforward to verify that in terms of the variable Φ = e −φ , the equations ( 20) and (21) read…”

mentioning

confidence: 99%

General relativity and Weyl geometry

Romero

Fonseca‐Neto

Pucheu

2012

Class. Quantum Grav.

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Exact solutions in brans-dicke theory: A dynamical system approach

Romero

Oliveira

1989

Astrophys Space Sci

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