期刊
PHYSICAL REVIEW D
卷 99, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.023528
关键词
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资金
- National Science Foundation of China [11621303, 11653003, 11773021]
- National Key R&D Program of China [2018YFA0404601]
- Hundred Talents (Young Talents) program from the CAS
- NSFC-CAS joint fund for space scientific satellites [U1738125]
- Chinese Academy of Sciences (CAS) Strategic Priority Research Program [XDA15020200]
- CAS Frontier Science Key Project [QYZDJ-SSW-SLH017]
- National Natural Science Foundation of China (NSFC) [11633004]
- NSFC-ISF joint research program [11761141012]
- NNSFC
The recently announced result by EDGES points an unexpected excess in the 21-cm global brightness temperature from cosmic dawn at z similar to 17, potentially indicating new phenomena beyond the Lambda CDM model. A generic cosmological model which allows conformal and disformal couplings between dark matter and dark energy is employed to investigate the impact on the 21-cm absorption signal and understand the EDGES anomaly. After exploring a wide range of parameter space for couplings, we find that the coupling effects can lead to a moderate change in the Hubble parameter while a negligible change in the spin temperature in the early Universe. Consequently, the decrease of the Hubble parameter from the mixed conformal and disformal couplings can reproduce the 21-cm absorption approximately in consistent with the EDGES result at z = 17.5. However, there is still tension in corresponding parameter space between EDGES and other cosmological observations for this model.
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