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arXiv 1804.05085gr-qcastro-ph.CO
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具有可变张力的膜作为晚期宇宙加速问题的可能解决方案

Brane with variable tension as a possible solution to the problem of the late cosmic acceleration

Miguel A. Garcia-Aspeitia, A. Hernandez-Almada, Juan Magaña, Mario H. Amante, V. Motta, C. Martínez-Robles

摘要:

膜世界模型被认为是宇宙加速膨胀问题的可能解决方案。这个想法是分配暗能量(DE),并以五维几何驱动晚期宇宙加速。在这里,我们研究了一个膜模型与可变膜张力作为红移的函数称为计时膜。我们提出了多项式$λ=(1+z)^{n}$函数的灵感在跟踪标量场的潜力。为了限制$n$指数,我们使用了来自宇宙计时器的最新观测哈勃数据,来自完整JLA样本的Ia型超新星,重子声学振荡和普朗克2015年测量的宇宙微波背景的后距离。对这些数据的联合分析估计出了$n\simeq6.19$,它在弗里德曼方程中产生了一个类似于DE或类似于宇宙常数的项,该项来自额外的维度。这个模型与这些数据是一致的,并且可以在后期将宇宙推向加速阶段。

英文摘要:

Braneworld models have been proposed as a possible solution to the problem of the accelerated expansion of the Universe. The idea is to dispense the dark energy (DE) and drive the late-time cosmic acceleration with a five-dimensional geometry. Here, we investigate a brane model with variable brane tension as a function of redshift called chrono-brane. We propose the polynomial $λ=(1+z)^{n}$ function inspired in tracker-scalar-field potentials. To constrain the $n$ exponent we use the latest observational Hubble data from cosmic chronometers, Type Ia Supernovae from the full JLA sample, baryon acoustic oscillations and the posterior distance from the cosmic microwave background of Planck 2015 measurements. A joint analysis of these data estimates $n\simeq6.19$ which generates a DE-like or cosmological-constant-like term, in the Friedmann equation arising from the extra dimensions. This model is consistent with these data and can drive the Universe to an accelerated phase at late times.

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