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arXiv 1811.04445gr-qcastro-ph.CO
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标量张量矢量引力中的线性宇宙学扰动

Linear cosmological perturbations in Scalar-tensor-vector gravity

Sara Jamali, Mahmood Roshan, Luca Amendola

摘要:

我们研究的宇宙学扰动的标量-张量-矢量引力理论的背景下,在文献中称为MOG。最近的研究表明,MOG再现了一个可行的背景宇宙学演化的$Λ$ CDM。然而,物质主导的时代略有不同。本文研究了线性物质扰动,并估计了相应的修正重力参数。我们发现,MOG降低了扰动的增长率,并与RSD数据比较表明,MOG表明$σ_8$的值更高,相比$Λ$ CDM。这一点对MOG的宇宙学可行性构成了强有力的挑战。

英文摘要:

We investigate the cosmological perturbations in the context of a Scalar-Tensor-Vector theory of Gravity known as MOG in the literature. Recent investigations show that MOG reproduces a viable background cosmological evolution comparable to $Λ$CDM. However, the matter-dominated era is slightly different. In this paper, we study the linear matter perturbations and estimate the relevant modified gravity parameters. We show that MOG reduces the growth rate of the perturbations and comparing with the RSD data reveals that MOG suggests a higher value for $σ_8$, compare to $Λ$CDM. This point, constitutes a powerful challenge to the cosmological viability of MOG.

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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