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arXiv 2505.15768astro-ph.COastro-ph.HEgr-qc
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当前对最小扩展变化光速模型的约束通过宇宙距离双关系

Current constraints on the minimally extended varying speed of light model through the cosmic distance duality relation

Jaiane Santos, Carlos Bengaly, Rodrigo S. Gonçalves

AI总结:

通过宇宙距离双关系测试最小扩展变化光速模型的可行性,发现无显著证据支持该模型。

摘要:

标准宇宙学模型最关键的测试之一是检验基本物理常数的可能变化。在如最小扩展变化光速模型(meVSL)等框架中,光度距离(D_L)和角直径距离(D_A)之间的关系,即宇宙距离双关系(CDDR),预计会偏离η(z)≡D_L/D_A(z)(1+z)^{-2}=1,使其成为检验基本常数潜在变化的强大探测器。因此,我们通过比较来自不同调查(如SDSS、DES和DESI)的横切(2D)和各向异性(3D)的宇宙学振荡(BAO)观测提供的D_A测量值,以及来自Pantheon+Ia型超新星(SNe)汇编的D_L测量值,来测试meVSL模型的可行性。在SN数据上使用高斯过程重建,以在相同红移下匹配D_A与D_L。我们发现,在考虑SN与2D和3D BAO样本结合的情况下,标准CDDR关系在1-2.6σ置信水平内没有偏离。然而,当仅考虑SN和2D BAO时,标准CDDR仅在约4σ置信水平下被恢复。然而,这一结果可能是由于最近讨论的SN和BAO数据集之间的紧张关系,尤其是在低红移处,以及BAO数据集之间可能的不一致。因此,我们的结果表明,在考虑这些潜在系统误差后,没有显著证据支持meVSL模型。

英文摘要:

One of the most crucial tests of the standard cosmological model consists on testing possible variations on fundamental physical constants. In frameworks such as the minimally extended varying speed of light model (meVSL), the relationship between the luminosity distance ($D_{\text{L}}$) and the angular diameter distance ($D_{\text{A}}$), namely the cosmic distance duality relation (CDDR), is expected to deviate from $η(z) \equiv D_{\text{L}}/D_{\text{A}}(z)(1+z)^{-2} = 1$, making it a powerful probe to check a potential variation of fundamental constants. Hence, we test the viability of the meVSL model through the CDDR by comparing $D_{\text{A}}$ measurements, provided by the transverse (2D) and anisotropic (3D) baryon acoustic oscillations (BAO) observations from different surveys, like SDSS, DES and DESI, in combination with $D_{\text{L}}$ measurements from Pantheon+ type Ia Supernova (SNe) compilation. The Gaussian Process reconstruction is employed on the SN data to match $D_{\text{A}}$ with $D_{\text{L}}$ at the same redshift. We find no deviation of the standard CDDR relation within 1-2.6$σ$ confidence level when considering SNe with 2D and 3D BAO samples combined together. However, when SNe and 2D BAO only are considered, the standard CDDR is only recovered at $\sim 4σ$ confidence level. However, such a result might be due to some recently discussed tensions between SN and BAO datasets, especially at low redshifts, in addition to possible inconsistencies between the BAO datasets individually. Therefore, our results show no significant evidence in favour of the meVSL model, once these potential systematics are taken into account.

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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