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arXiv 2407.16992gr-qc
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含挠率的全息暗能量

Holographic Dark Energy with Torsion

Yongjun Yun, Jungjai Lee

AI总结:

本文研究带轴挠率的全息暗能量模型,基于Einstein-Cartan引力推导其暗能量状态方程,对比不同红外截断下的宇宙膨胀表现,给出哈勃半径截断实现加速膨胀的条件及对应参数取值。

摘要:

本文研究满足宇宙学原理的带轴挠率的全息暗能量模型。随后,基于爱因斯坦-嘉当(Einstein-Cartan)引力理论推导的新方程,利用挠率形式的弗里德曼方程,得到了该模型中暗能量的状态方程。研究发现,以粒子视界作为红外(IR)截断的扩展全息暗能量无法解释宇宙的加速膨胀;以未来事件视界作为红外截断时仍可得到宇宙加速膨胀的结果;与之不同,当轴挠率处于超光速区域时,以哈勃半径作为红外截断存在实现宇宙加速膨胀的可能。更精确地,当挠率与物质密度的当前比值γ⁰=0.5时,暗能量的状态方程ω_Λ≅-1。

英文摘要:

We consider the holographic dark energy model with axial torsion which satisfy the cosmological principle. Subsequently, by using the torsional analogues of Friedmann equations for the new equation from Einstein-Cartan gravity theory, we obtain the equation of state for dark energy in this model. We find that the extended holographic dark energy from the particle horizon as the infrared (IR) cut-off does not give the accelerating expansion of the universe. Also, employing the future event horizon as IR cut-off still achieves the accelerating expansion of the universe. In contrast, there is a possibility that the Hubble radius as IR cut-off achieves to the accelerating expansion of the universe in superluminal region for axial torsion. More precisely, the current value of ratio for torsion to the matter density, $γ^{0}=0.5$ gives the equation of state of dark energy $ω_Λ\cong-1$.

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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