期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
在Einstein-Cartan理论中宇宙无毛猜想(CNHC)的验证
1
作者 沈利明 孙迺疆 +1 位作者 吉桂芳 陆惠卿 《自然杂志》 北大核心 2001年第1期59-60,共2页
关键词 爱因斯坦-卡当理论 宇宙无毛猜想 宇宙演化 BIANCHI各向异性宇宙
下载PDF
Anisotropic Open Cosmological Models of Spin Matter with Magnetic Moment
2
作者 SHENLi-ming SUNNai-jiang 《Journal of Shanghai University(English Edition)》 CAS 2001年第3期196-200,共5页
We have derived a set of field equations for a Weyssenhoff spin fluid including magnetic interaction among the spinning particles prevailing in spatially homogeneous, but anisotropically cosmological models of Bianchi... We have derived a set of field equations for a Weyssenhoff spin fluid including magnetic interaction among the spinning particles prevailing in spatially homogeneous, but anisotropically cosmological models of Bianchi type V based on Einstein Cartan theory. We analyze the field equations in three different equations of states specified by p =(1/3)ρ, p =ρ and p =0. The analytical solutions found are non singular provided that the combined energy arising from matter spin and magnetic interaction among particles overcomes the anisotropy energy in the Universe. We have also deduced that the minimum particle numbers for the radiation ( p =(1/3)ρ ) and matter ( p =0) epochs are 10 88 and 10 108 respectively, the minimum particle number for the state p =ρ is 10 96 , leading to the conclusion that we must consider the existence of neutrinos and other creation of particles and anti particles under torsion and strong gravitational field in the early Universe. 展开更多
关键词 Weyssenhoff spin fluid Einstein Cartan theory Bianchi type V model radiation and matter epochs
下载PDF
Constant Angle Surfaces in the Heisenberg Group 被引量:2
3
作者 Johan FASTENAKELS Marian Ioan MUNTEANU Joeri VAN DER VEKEN 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2011年第4期747-756,共10页
In this article we extend the notion of constant angle surfaces in S2 × R and H2 ×R to general Bianchi-Cartan-Vranceanu spaces. We show that these surfaces have constant Gaussian curvature and we give a comp... In this article we extend the notion of constant angle surfaces in S2 × R and H2 ×R to general Bianchi-Cartan-Vranceanu spaces. We show that these surfaces have constant Gaussian curvature and we give a complete local classification in the Heisenberg group. 展开更多
关键词 Heisenberg group bianchi-cartan Vranceanu space constant angle surface
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部