Discrete Cosmological Models in the Brans-Dicke Theory of Gravity
| Autor: | Jessie Durk, Timothy Clifton |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Coupling constant
Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics Scalar (mathematics) FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Cosmology General Relativity and Quantum Cosmology Numerical integration symbols.namesake Theoretical physics 0103 physical sciences Brans–Dicke theory symbols Einstein 010306 general physics Field equation Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1903.03043 |
| Popis: | We consider the problem of building inhomogeneous cosmological models in scalar-tensor theories of gravity. This starts by splitting the field equations of these theories into constraint and evolution equations, and then proceeds by identifying exact solutions to the constraints. We find exact, closed form expressions for geometries that correspond to the initial data for cosmological models containing regular arrays of point-like masses. These solutions extend similar methods that have recently been applied to Einstein's equations, and provides sufficient initial conditions to perform numerical integration of the evolution equations. We use our new solutions to study the effects of inhomogeneity in cosmologies governed by scalar-tensor theories of gravity, including the spatial inhomogeneity allowed in Newton's constant. Finally, we compare our solutions to their general relativistic counterparts, and investigate the effect of changing the coupling constant between the scalar and tensor degrees of freedom. Comment: 18 pages, 8 figures |
| Databáze: | OpenAIRE |
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