Open AccessA(4 + 1)-DIMENSIONAL COSMOLOGICAL MODEL
Author(s) -
Zhu Jiong-Min,
Shi-Chang Zhu,
Hongxia Guo
Publication year - 1985
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.34.1342
Subject(s) - physics , spacetime , subspace topology , cosmological constant , de sitter universe , tensor (intrinsic definition) , einstein field equations , mathematical physics , classical mechanics , general relativity , quantum mechanics , universe , mathematical analysis , geometry , mathematics
The (4+1)-dimensional cosmological model discussed in this paper is a direct product of the usual 4-dimensional spacetime and a. 1-dimensional compaetified internal space. The energy density of the 4-dimensional spacetime is supposed to be dominated by incoherent radiation and the energy-momentum tensor of the internal subspace is a step function. By solving the 5-dimensional Einstein field equations without cosmolog-ical term we get the de-Sitter solution to describe the usual spacetime and at a certain time it changes to the radiation-dominated solution for standard model, and the size of the internal subspace changes with time in a form of oscillation with amplitude attenuating and then contracts to a constant.