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arXiv 1601.06706gr-qchep-th
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扩展的Starobinsky引力模型中的阿贝尔宇宙弦

Abelian cosmic string in the extended Starobinsky model of gravity

J. P. Morais Graça, V. B. Bezerra

摘要:

我们数值分析的行为对应的阿贝尔宇宙弦考虑到扩展的Starobinsky模型,其中的作用广义相对论是取代$f(R) = R - 2Λ+ ηR^2 + ρR^m$,与$m > 2$的解决方案。作为一个有趣的结果,我们发现宇宙弦的角亏损随着参数$η$和$ρ$的增加而减小。我们还发现,由于宇宙学常数的存在,宇宙视界会受到影响,它会变大或变小,这取决于标量场的真空期望值和宇宙学常数的值

英文摘要:

We analyze numerically the behaviour of the solutions corresponding to an Abelian cosmic string taking into account an extension of the Starobinsky model, where the action of general relativity is replaced by $f(R) = R - 2Λ+ ηR^2 + ρR^m$, with $m > 2$. As an interesting result, we find that the angular deficit which characterizes the cosmic string decreases as the parameters $η$ and $ρ$ increase. We also find that the cosmic horizon due to the presence of a cosmological constant is affected in such a way that it can grows or shrinks, depending on the vacuum expectation value of the scalar field and on the value of the cosmological constant

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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