宇宙在未来会减速吗？
Can the Universe decelerate in the future?
AI总结：
本文扩展Ratra-Peebles精质模型以允许宇宙未来减速，并利用最新SNe Ia、$H(z)$数据及高斯过程检验该可能性。
摘要：
本文在精质标量场宇宙学背景下，研究了遥远未来膨胀宇宙发生减速的可能性。这种可设想的演化通过SNe Ia和$H(z)$宇宙计时仪数据，并借助基于Gaussian Processes（高斯过程）的模型无关方法进行了检验。该标量场模型是指数Ratra-Peebles（RP）精质宇宙学的扩展，其势现在取决于一对参数$(\alpha,\lambda)$，并预言未来会出现减速膨胀。与RP方法不同，$\alpha$参数允许未来出现减速宇宙学，从而阻止宇宙协和模型$(\Lambda$CDM)所预言的向de Sitter宇宙学的必然演化。利用最新的SNe Ia和$H(z)$数据更新了统计模型分析，得到$H_0=68.6\pm3.7$ km/s/Mpc、$\Omega_{\Phi0}=0.735^{+0.083}_{-0.069}$、$\alpha<6.56$和$\lambda<0.879$（在$2\sigma$置信水平下）。研究还发现，扩展RP模型在$H(z)$和SNe Ia数据下都允许未来减速。然而，在模型无关的Gaussian Processes分析中，未来减速仅在$H(z)$数据情形下被允许。
英文摘要：
The possibility of an expanding decelerating Universe in the distant future is investigated in the context of a quintessence scalar field cosmology. Such a conceivable evolution is tested against SNe Ia and $H(z)$ cosmic chronometers data, and also through a model independent method based on Gaussian Processes. The scalar field model is an extension of the exponential Ratra-Peebles (RP) quintessential cosmology whose potential now depends on a pair of parameters ($α, λ)$ and predicts a decelerated expansion in the future. Different from RP approach the $α$ parameter allows for a decelerating cosmology in the future thereby frustrating the inevitable evolution for a de Sitter Cosmology as predicted by the cosmic concordance model ($Λ$CDM). The statistical model analysis is updated with the most recent SNe Ia and $H(z)$ data thereby obtaining $H_0 = 68.6\pm3.7$ km/s/Mpc, $Ω_{\Phi0} = 0.735^{+0.083}_{-0.069} $, $α< 6.56$ and $λ< 0.879 $ (at $2σ$ c.l.). It is also found that the extended RP model allows for a future deceleration both for $H(z)$ and SNe Ia data. In the (model-independent) Gaussian Processes analysis, however, future deceleration is allowed only in the case of $H(z)$ data.
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。
