摘要
对定域旋转对称的毕安基-Ⅸ型宇宙弦模型进行了研究,讨论了两个模型,第一个模型中引入了一个普遍采用的状态方程ρ=kλ,第二个模型中引入了粘滞系数与体积膨胀系数成正比的条件ξ=hθ.我们对两个模型的物理和几何性质作了讨论,这些模型描述的是一个以大爆炸为开始的连续膨胀的宇宙模型,并把文献中的一些结果作为特例包括在内.
The locally rotationally symmetric Bianchi type Ⅸ string cosmological models with bulk viscosity are investigated. The investigation is made in two cases, in the first case a Takabayasi＇ s equation of state ρ=kλ is assumed and in the second case an assumption of the coefficient of bulk viscosity being proportional to the scalar of expansion ξ=hθ is adopted. The physical features of the models are also discussed. The models describe continuously expanding universe with a big-bang start and includes the results previously given in the literatures as the special cases.
出处
《安徽师范大学学报（自然科学版）》
CAS
2007年第3期238-243,共6页
Journal of Anhui Normal University(Natural Science)
基金
Supported by the Special Project Grants of Anhui Normal University(2003xzx01)
Key the Subject Foundation for Atomic andMolecular Physics of Anhui Province
关键词
弦宇宙模型
毕安基Ⅸ型时空
体积粘滞性
string cosmological model
bianchi type Ⅸ space-time
bulk viscosity
