共查询到10条相似文献,搜索用时 328 毫秒
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通过引力作用下理想气体运动连续性方程的无量纲化,根据量纲理论Π定理,以尺度因子R(t)为物理量统一度量基准,发现了引力作用下理想气体宇宙模型的自相似性和一系列R(t)的解析解.基于R(t),可建立对应的、具有非欧氏几何特性的均匀膨胀时空坐标系S(t,ξ,θ,φ),并获得一个密度ρ为常数、速度u为零、压强p不为零的理想气体宇宙解.在这个解的形式中,光子红移量z所表现的是光子传播距离r,当红移量z较小时两者成正比(即哈勃定律).由均匀膨胀坐标系还可推导出Robertson-Walker度规(k=
关键词:
宇宙
自相似
哈勃定律 相似文献
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We present a set of tools and general-pupose applications for the simulation of astrophysics and astroparticle experiments,concerning both physics and radiation background studies.They addrss the speific requirements of various typical astroparticle detectors:new-generation X-and γ-ray detectors on satellites,underground detectors for astroparticle experiments and solar system explorations. 相似文献
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In the light of the recent observations of type Ia supernovae (SNe Ia) suggesting an accelerating Universe,we show the possibility of a coupled real scalar field to be quintessence for the source of the accelerating Universe.We derive the main equations which govern the evolution of the Universe and rewrite them with the observable quantities.Finally we point out very briefly how future observations may determine the equation of state of quintessence. 相似文献
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2000年,在一项"年轻宇宙的星系辨认"的巡天计划中,天文学家发现了两个巨大的正在发光的气体云团.两者从地球上看过去就像是两片圆形斑(blob),它们所处的时代是:宇宙的年龄仅仅25亿岁左右,那时 相似文献
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四种相互作用的强度之比及其与宇宙结构之间的关系 总被引:1,自引:0,他引:1
作者根据工科物理教学中学生对一些教材中出现的对四种相互作用强度之比的不同描述提出的疑问,指出了四种相互作用强度之比的规范表述为110-210-510-39的由来及其与当今宇宙结构之间的关系. 相似文献
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We try to propose a new model of the creation of Universe.First,the de Sitter spacetime is created from nothing and then we obtain an anti-de Sitter spacetime which has closed time-like curves by analytical continuation.We know that the anti-de Sitter spacetime is classically unstable,so it is easier to create an inflationary bubble universe as that we live in. 相似文献