Abstract
I study the dynamical effects due to the Brans-Dicke scalar φ-field at the early stages of a supposedly anisotropic Universe expansion in the scalar-tensor cosmology of Jordan-Brans-Dicke. This is done considering the behaviour of the general solutions for the homogeneous model of Bianchi type VII in the vacuum case. I conclude that the Bianchi-VII0 model shows an isotropic expansion and that its only physical solution is equivalent to a Friedman-Robertson-Walker spacetime whose evolution can, depending on the value of the JBD coupling constant, begin in a singularity and, after expanding (inflating, if ω > 0), shrink to another, or starting in a non-singular state, collapse to a singularity. I also conclude that the general Bianchi-VII h (with h ≠ 0) models show strong curvature singularities producing a complete collapse of the homogeneity surfaces to 2D-manifolds, to 1D-manifolds or to single points. Our analysis depends crucially on the introduction of the so-called intrinsic time, Φ, as the product of the JBD scalar field φ times a mean scale factor a 3 = a 1 a 2 a 3, in which the finite-cosmological-time evolution of this universe unfolds into an infinite Φ-range. These universes isotropize from an anisotropic initial state, thence I conclude that they are stable against anisotropic perturbations.
Similar content being viewed by others
REFERENCES
Brans, C., and Dicke, R. H. (1961). Phys. Rev. 124, 925.
Carretero-González, R., Núñez-Yépez, H. N., and Salas-Brito, A. L. (1994). Phys. Lett. A 188, 48.
Cervantes-Cota, J. L., and Chauvet, P. (1999). Phys. Rev. D 59, 0403501.
Chauvet, P., Núñez-Yépez, H. N., and Salas-Brito, A. L. (1991). Astrophys. Sp. Sci. 178, 165.
Chauvet, P., Cervantes-Cota, J., and Núñez-Yépez, H. N. (1992). Class. Quantum Grav. 9, 1923.
Chauvet, P., and Cervantes-Cota, J. (1995). Phys. Rev. D 52, 3416.
Christodoulakis, T., Kofinas, G., and Zarikas, V. (2000). Phys. Lett. A 275, 182.
Clancy, D., Lidsey, J. E., and Tavakol, R. (1998). Class. Quantum Grav. 15, 257.
Dicke, R. H. (1964). In Gravitation and Relativity (eds. Chiu, H. and Hoffman, W.), W. A. Benjamin: New York and Amsterdam.
Gasperini, M., and Veneziano, G. (1994). Phys. Rev. D 50, 2519.
Jordan, P. (1959). Z. Phys. 157, 112.
Núñez-Yépez, H. N. (1995). Soluciones exactas y caos en la cosmología de Jordan, Brans y Dicke, Tesis doctoral, Universidad Autónoma Metropolitana, Mexico City.
Núñez-Yépez, H. N. (1999). Phys. Lett. A 258, 210.
Rainville, E. D. (1980). Special Functions, New York: Chelsea.
Raychaudhuri, A. K., and Modak, B. (1988). Class. Quantum Grav. 5, 225.
Ruban, V. A., and Finkelstein, A. M. (1975). Gen. Rel. Grav. 6, 601.
Ryan, M. P., and Shepley, L. C. (1975). Homogeneous relativistic cosmologies, Princeton: Princeton University Press, pp. 113–267.
Steinhardt, P. J. (1993). Class. Quantum Grav. 10, S33.
Turner, M. J., and Weinberg, E. J. (1997). Phys. Rev. D 56, 4604.
Wald, R. M. (1984). General Relativity, Chicago: University of Chicago Press.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Núñez-Yépez, H.N. Isotropic Evolution of a JBD Anisotropic Bianchi Universe. General Relativity and Gravitation 33, 1767–1782 (2001). https://doi.org/10.1023/A:1013027201473
Issue Date:
DOI: https://doi.org/10.1023/A:1013027201473