Fate of bound systems in phantom and quintessence cosmologies
Fate of bound systems in phantom and quintessence cosmologies
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DOI：
10.1103/physrevd.70.123529
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发表时间：
2004-10
影响因子：
5
通讯作者：
S. Nesseris;L. Perivolaropoulos
中科院分区：
文献类型：
--
作者：
S. Nesseris;L. Perivolaropoulos
我们分析和数值研究了加速膨胀的宇宙中束缚系统的演化，其中加速随着时间的推移而增加到大撕裂奇点（幻影宇宙论）或随着时间的推移而减少（精粹论）。我们证实了Caldwell等人的发现。R.考德威尔，M.卡米恩科夫斯基和N. N.温伯格，物理学家。Rev. Lett. 91,071301（2003）。在幻影宇宙论中，束缚结构被解离，但我们证明这种情况发生得比参考文献[R]中预期的要早。R.考德威尔，M.卡米恩科夫斯基和N. N.温伯格，物理学家。Rev. Lett. 91, 071301 (2003). [j]。特别地，我们发现当一个有界系统变得无界时的“撕裂时间”并不是由平均值（{rho}+3p）引起的排斥幻能引力势与系统质量M的吸引引力势平衡的时间。相反，“撕裂时间”是时间相关有效势（包括离心项）的最小值消失的时间。对于银河系来说，这发生在大撕裂奇点之前大约180兆尔，而不是[R]中所示的大约60兆尔。R.考德威尔，M.卡米恩科夫斯基和N. N.温伯格，物理学家。Rev. Lett. 91,071301（2003）。]以获得w=-1.5的幻影宇宙论。给出了解离束缚轨道的数值重建方法。«少
We study analytically and numerically the evolution of bound systems in universes with accelerating expansion where the acceleration either increases with time towards a Big Rip singularity (phantom cosmologies) or decreases with time (quintessence). We confirm the finding of Caldwell et al. [R. R. Caldwell, M. Kamionkowski and N. N. Weinberg, Phys. Rev. Lett. 91, 071301 (2003).] that bound structures get dissociated in phantom cosmologies but we demonstrate that this happens earlier than anticipated in Ref. [R. R. Caldwell, M. Kamionkowski and N. N. Weinberg, Phys. Rev. Lett. 91, 071301 (2003).]. In particular we find that the 'rip time' when a bound system gets unbounded is not the time when the repulsive phantom energy gravitational potential due to the average ({rho}+3p) balances the attractive gravitational potential of the mass M of the system. Instead, the 'rip time' is the time when the minimum of the time-dependent effective potential (including the centrifugal term) disappears. For the Milky Way galaxy this happens approximately 180 Myrs before the Big Rip singularity instead of approximately 60 Myrs indicated in [R. R. Caldwell, M. Kamionkowski and N. N. Weinberg, Phys. Rev. Lett. 91, 071301 (2003).] for a phantom cosmology with w=-1.5. A numerical reconstruction ofmore » the dissociating bound orbits is presented.« less