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arXiv 2606.00549astro-ph.CO
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来自Fermi GRB和Pantheon+ SNe Ia的全GRB协方差对相互作用暗能量的约束

Interacting dark energy constraints from Fermi GRBs and Pantheon+ SNe Ia with full GRB covariance

School of Physics and Astronomy, China West Normal University(西华师范大学物理与天文学院);School of Physics and Electronics, Henan University(河南大学物理与电子学院)

Jianfeng Meng, Xiaofeng Yang, Yunliang Ren, Yangjun Shi, Bohao Wang, Jingze Li, Xiongwei Liu

AI总结:

利用Fermi/GBM长暴和Pantheon+ SNe Ia数据,通过全GRB协方差分析,检验相互作用暗能量模型相对于ΛCDM模型的证据,发现当前数据不支持相互作用暗能量。

摘要:

标准ΛCDM模型面临长期的理论和观测问题,如哈勃常数张力,这促使人们考虑超出ΛCDM的扩展模型,包括相互作用暗能量(IDE)。Ia型超新星(SNe Ia)是晚期宇宙膨胀历史的精确探针,而伽马射线暴(GRB)可以将距离测量扩展到更高红移。然而,GRB宇宙学依赖于光度关系的校准、协方差处理以及内在弥散。在这项工作中,我们使用15年的Fermi/GBM长暴观测数据和Pantheon+ SNe Ia来检验当前距离数据是否提供支持IDE模型而非ΛCDM的证据。我们比较了四种平坦模型:ΛCDM、wCDM、IDE-ρ_de和IDE-ρ_c。GRB协方差通过传播Amati关系校准协方差构建,GRB内在弥散作为干扰参数采样。同时考虑对角GRB协方差作为稳健性检验。使用全GRB协方差时,GOLD和FULL样本在ΛCDM下均给出H_0≈72.8 km s^{-1} Mpc^{-1}。IDE模型未能充分改善拟合以补偿其额外参数,BIC倾向于更简单的ΛCDM模型。对角协方差检验得出相同的模型选择结论,尽管它改变了拟合的GRB内在弥散。我们得出结论,对于这里考虑的两种相互作用形式以及当前GRB系统学水平,当前GRB和Pantheon+数据不提供相互作用暗能量的证据。当前GRB主要提供哈勃图的高红移延伸并检验膨胀历史的形状。

英文摘要:

The standard $Λ$CDM model faces long-standing theoretical and observational problems, such as the Hubble tension, which motivate extensions beyond $Λ$CDM, including interacting dark energy (IDE). Type Ia supernovae (SNe Ia) are precise probes of the late-time expansion history, while gamma-ray bursts (GRBs) can extend the Hubble diagram to higher redshifts. However, GRB cosmology depends on careful calibration and uncertainty modeling. Using an Amati relation calibrated with the corresponding low-redshift GRBs, we construct distance moduli for the high-redshift subsets of the 15-year \textit{Fermi}/GBM GOLD and FULL samples and combine them with Pantheon+ SNe Ia to compare flat $Λ$CDM, $w$CDM, IDE-$ρ_{\rm de}$, and IDE-$ρ_{\rm c}$ models. The covariance of the calibrated Amati intercept and slope is propagated into a full, non-diagonal GRB distance-modulus covariance, and an effective residual scatter, $σ_{\rm res,μ}$, is fitted jointly with the cosmological parameters. The GOLD and FULL samples yield very similar constraints on the main cosmological parameters. With either the full or diagonal GRB covariance, the IDE models do not improve likelihood sufficiently to compensate for their additional parameters, and the BIC favors $Λ$CDM. A SNe-only comparison shows that the additional constraining power of the GRBs is generally modest. Current GRB and Pantheon+ distance measurements provide no significant evidence for either of the two IDE interactions considered here.

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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