Extended inflation in higher-dimensional spacetime with a Brans-Dicke scalar field

Journal Article · Mon Mar 01 00:00:00 EST 1993 · General Relativity and Gravitation; (United States)

DOI:https://doi.org/10.1007/BF00756265· OSTI ID:6610979

Chatterjee, S; Sil, A ^[1]

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1. Jadavpur Univ., CAlcutta (India)

Starting from an assumption of homogeneity of matter-energy tensor and Brans-Dicke (BD) scalar field the authors obtain a Robertson-Walker type of metric form in five-dimensional spacetime with the essential difference that their model is spatially inhomogeneous. The model exhibits an interesting feature in that as they approach the center of symmetry the compact dimension becomes very large, with the implication that the Kaluza-Klein excitations become very light when located there and that the origin may represent a singular concentration of matter with motion in the extra dimension. Following Wesson the effective 4D properties of matter from the 5D vacuum solutions are also briefly discussed. Assuming particular functional relationships between [rho] and p as also between the scale factor and scalar field, the authors obtain exact solutions which may be of relevance to the early universe and its extended inflation in the BD type of theory. They also discuss very briefly rollover time immediately after tunneling to the true vacuum state to explore if dimensionality has any marked influence on the situation. 26 refs.

• OSTI ID: 6610979
• Journal Information: General Relativity and Gravitation; (United States), Vol. 25:3; ISSN 0001-7701
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GRAND UNIFIED THEORY
MANY-DIMENSIONAL CALCULATIONS
SPACE-TIME
COSMOLOGICAL MODELS
ENERGY-MOMENTUM TENSOR
METRICS
SYMMETRY
FIELD THEORIES
MATHEMATICAL MODELS
PARTICLE MODELS
TENSORS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
661310* - Relativity & Gravitation- (1992-)