最小超空间广义不确定性原理变形的晚期宇宙学测试
Late-Time Cosmological Tests of a Minisuperspace Generalized-Uncertainty-Principle Deformation
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中文总结 AI 辅助
研究宇宙学中量子引力效应，通过对FLRW最小超空间泊松代数的二次GUP变形，修改弗里德曼方程。利用多种观测数据限制分析于背景可观测量，与ΛCDM等比较，得出不同可信度下的β*值，为宇宙学研究提供新测试。
中文摘要 AI 辅助
宇宙学中可能的量子引力效应研究备受关注，特别是能与晚期膨胀观测进行对比时。本文研究了FLRW最小超空间泊松代数的二次广义不确定性原理（GUP）变形。一阶变形参数下，构建修改了弗里德曼方程及均匀膨胀历史。因未确定唯一扰动扇区，我们将分析限制在背景可观测量，用31个宇宙计时器测量、未校准的1580个对象的Pantheon +哈勃流样本及13分量的DESI DR2重子声学振荡似然性，将声视界视为干扰参数。我们将所得宇宙学与平坦的ΛCDM及Chevallier - Polarski - Linder参数化进行比较。对于基线归一化，在68%可信度下得到β* = - 0.086 +0.040 -0.032 ，在95%可信度下为 - 0.142 < β* < 0.005。
英文摘要
The investigation of possible quantum-gravity effects in cosmology is of considerable interest, especially when such effects can be tested against observations of the late-time expansion. In the present work we study a quadratic generalized-uncertainty-principle (GUP) deformation of the FLRW minisuperspace Poisson algebra. At first order in the deformation parameter, the construction modifies the Friedmann equation and hence the homogeneous expansion history. Since it does not determine a unique perturbation sector, we restrict the analysis to background observables, using 31 cosmic-chronometer measurements, the uncalibrated 1580-object Pantheon$+$ Hubble-flow sample, and the 13-component DESI DR2 baryon-acoustic-oscillation likelihood, while treating the sound horizon as a nuisance parameter. We compare the resulting cosmology with flat \LCDM{} and with the Chevallier--Polarski--Linder parametrization. For the baseline normalization we obtain $\betastar=-0.086^{+0.040}_{-0.032}$ at $68\%$ credibility and $-0.142<\betastar<0.005$ at $95\%$ credibility.
