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arXiv 0903.4073hep-th
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非最小耦合修正引力的弦激励五分模型

String Inspired Quintom Model with Non-minimally Coupled Modified Gravity

J Sadeghi, M R Setare, A Banijamali

摘要:

本文考虑了一个标量场与修正引力(已知的$f(R)$引力)之间存在非最小耦合的五分模型。标量场的拉氏量是受弦论中的快子拉氏量的启发。得到了状态方程,以及当$ω$穿越-1时模型参数所需的条件。该模型表明,对于跨越-1的$ω$,不需要在作用的快子部分中添加一些高阶导数算子(通常用于获得EoS参数的幻影分界线的交叉的方式)。

英文摘要:

In this paper we consider a quintom model of dark energy with non-minimal coupling between scalar field and modified gravity which is known $f(R)$ gravity. The Lagrangian for scalar field has been inspired by tachyonic Lagrangian in string theory. Then we obtain the equation of state (EoS), and the condition required for the model parameters when $ω$ crosses over -1. This model shows that for having $ω$ across over -1, one doesn't need to add some higher derivative operator in the tachyonic part of action (the way that usually used to obtain crossing of the phantom divide line for EoS parameter).

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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