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arXiv 1008.2182astro-ph.COgr-qchep-th
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幻影幂律宇宙学的观测约束

Observational constraints on phantom power-law cosmology

Chakkrit Kaeonikhom, Burin Gumjudpai, Emmanuel N. Saridakis

摘要:

我们调查幻影宇宙学的比例因子是一个幂律,我们使用宇宙学观测宇宙微波背景(CMB),重子声学振荡(BAO)和观测哈勃数据,以施加完整的约束模型参数。我们发现,幂律指数是$β\approx-6.51^{+0.24}_{-0.25}$,而大撕裂实现在$t_s\approx104.5^{+1.9}_{-2.0}$陀螺仪,在1 $σ$置信水平。提供晚时间的渐近表达式,我们发现,暗能量状态方程参数在大撕裂仍然是有限的,等于$w_{DE}\approx -1.153$,与暗能量密度和压力发散。最后,我们重建了幻影电位。

英文摘要:

We investigate phantom cosmology in which the scale factor is a power law, and we use cosmological observations from Cosmic Microwave Background (CMB), Baryon Acoustic Oscillations (BAO) and observational Hubble data, in order to impose complete constraints on the model parameters. We find that the power-law exponent is $β\approx-6.51^{+0.24}_{-0.25}$, while the Big Rip is realized at $t_s\approx104.5^{+1.9}_{-2.0}$ Gyr, in 1$σ$ confidence level. Providing late-time asymptotic expressions, we find that the dark-energy equation-of-state parameter at the Big Rip remains finite and equal to $w_{DE}\approx -1.153$, with the dark-energy density and pressure diverging. Finally, we reconstruct the phantom potential.

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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