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arXiv 1607.03396gr-qc
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Quintom宇宙学模型及利用Lie和Noether对称性的一些可能解

Quintom cosmological model and some possible solutions using Lie and Noether symmetries

Sourav Dutta, Muthusamy Lakshmanan, Subenoy Chakraborty

摘要:

在空间平坦的各向同性均匀Friedmann-Lemaitre-Robertson-Walker(FLRW)宇宙框架下,研究了暗能量的五重模型.首先,对系统施加李点对称性,确定模型的未知耦合势。然后,Noether对称性,这也是一个点一样的对称性的拉格朗日,施加在物理系统和潜在的一般形式。证明了Noether对称李代数是相应的李对称李代数的子代数。最后,在三维增广空间中适当地执行点变换,使得变量之一变为循环的,并且因此对物理系统有相当大的简化。因此,守恒量(即运动常数)表示在一个紧凑的形式和宇宙学的解决方案进行评估和分析,在目前的情况下。

英文摘要:

The present work deals with a quintom model of dark energy in the framework of a spatially flat isotropic and homogeneous Friedmann-Lemaitre-Robertson-Walker (FLRW) universe. At first, Lie point symmetry is imposed to the system and the unknown coupled potential of the model is determined. Then Noether symmetry, which is also a point like symmetry of the Lagrangian, is imposed on the physical system and the potential takes a general form. It is shown that the Lie algebra of Noether symmetry is a sub-algebra of the corresponding Lie algebra of the Lie symmetry. Finally, a point transformation in the three dimensional augmented space is performed suitably so that one of the variables become cyclic and as a result there is considerable simplification to the physical system. Hence conserved quantities (i.e, constants of motion) are expressed in a compact form and cosmological solutions are evaluated and analyzed in the present context.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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