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arXiv 1501.04441gr-qc
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DBI暗能量与暗物质相互作用的动力学系统分析

Dynamical system analysis for DBI dark energy interacting with dark matter

Nilanjana Mahata, Subenoy Chakraborty

摘要:

本文研究了Dirac Born Infeld(DBI)宇宙模型的动力学系统分析。对于空间平坦的FRW时空,利用DBI情形下的爱因斯坦场方程研究了DBI暗能量与暗物质相互作用的动力学。DBI的暗能量模型被认为是一个标量场的非标准动能项。通过DBI标量场与暗物质流体之间的唯象相互作用,讨论了DBI暗能量与暗物质之间的相互作用。通过对基本变量进行适当的重新定义,将场方程化为一个自治动力系统。假设DBI标量场的势是指数的。最后确定了临界点,分析了临界点的性质,讨论了相应的宇宙学方案。

英文摘要:

A dynamical system analysis related to Dirac Born Infeld (DBI) cosmological model has been investigated in this present work. For spatially flat FRW space time, the Einstein field equation for DBI scenario has been used to study the dynamics of DBI dark energy interacting with dark matter. The DBI dark energy model is considered as a scalar field with a nonstandard kinetic energy term. An interaction between the DBI dark energy and dark matter is considered through a phenomenological interaction between DBI scalar field and the dark matter fluid. The field equations are reduced to an autonomous dynamical system by a suitable redefinition of the basic variables. The potential of the DBI scalar field is assumed to be exponential. Finally, critical points are determined, their nature have been analyzed and corresponding cosmological scenario has been discussed.

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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