发表机构
Shanghai Jiao Tong University; Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学; 上海交大李政道研究所)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本研究测试$\Lambda$LTB宇宙学作为动力学暗能量的替代方案,发现其与现有数据兼容,并提供了距离-红移关系及kSZ效应的解析表达式。
AI 中文摘要
在弱违反宇宙学原理(CP)的宇宙中,宇宙学常数$\Lambda$可以模仿FRW宇宙中的动力学暗能量(DDE),从而对最近报道的DDE证据提出挑战。我们以$\Lambda$LTB宇宙学的形式测试了这一情景,针对两组数据组合。(1)DESI DR2 BAO、Planck CMB,以及四个SNe Ia汇编(UNION3、Pantheon+、DES SN5YR和DES Dovekie)中的任意一个,均未显示出对DDE或$\Lambda$LTB的偏好。(2)加入运动学Sunyaev Zel'dovich(kSZ)效应后,排除了(1)所允许的CP违反参数空间中的大部分区域。然而,当前数据仍允许存在一个约300 Mpc$/h$、物质密度超出约10%的区域,因此它仍然是DDE的一个可行替代方案。为便于进一步测试,我们给出了弱CP违反宇宙中距离-红移关系和kSZ效应的解析表达式。
英文摘要
A cosmological constant $Λ$ in a universe weakly violating the cosmological principle (CP) can mimic a dynamical dark energy (DDE) in a FRW universe, and therefore challenging the recently reported DDE evidences. We test this scenario in the form of $Λ$LTB cosmology, against two data combinations. (1) DESI DR2 BAO, Planck CMB, together with any of the four SNe Ia compilations (UNION3, Pantheon+, DES SN5YR, and DES Dovekie) show no preference over DDE or $Λ$LTB. (2) The inclusion of the kinematic Sunyaev Zel'dovich (kSZ) effect rules out a large portion of the CP violation parameter space allowed by (1). However, the existence of a $\sim 300$ Mpc$/h$ region with $\sim 10\%$ matter density excess is still allowed by the current data, and therefore remains a viable alternative to DDE. To facilitate further tests, we present analytical expressions of the distance-redshift relation and the kSZ effect in a universe with weak CP violation.
Comments31 pages, 12 figures, 4 tables