%0 Journal Article
%T A(4 + 1)-DIMENSIONAL COSMOLOGICAL MODEL<br>一个4+1维宇宙模型
%A ZHU JIONG-MIN
%A ZHU SHI-CHANG
%A GUO HAN-YING
%A <br>朱炯明
%A 朱世昌
%A 郭汉英
%J 物理学报
%D 1985
%I 
%X 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.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=C25BB4639B39B1166FB7E60FA50DC9AD&yid=74E41645C164CD61&vid=339D79302DF62549&iid=F3090AE9B60B7ED1&sid=E3C11E2483CABC48&eid=AFB21040E5F48417&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0