http://arxiv.org/abs/2208.10363
The missing baryons in the universe are assumed to be hidden in the whole space as a warm-hot intergalactic medium (WHIM). Finding them is one of the important subjects in modern cosmology. In this paper, we point out that the very high energy electron/positron rays may light up the WHIM due to the anomalous bremsstrahlung according to the improved Bethe-Heitler formula. The resulting excess of the extragalactic background light (EBL) can be observed by the direct measurement method. A possible explanation on the difference between the direct and indirect measurements of EBL is also proposed. Thus, we open a new window to probe the WHIM properties via the EBL.
W. Zhu and R. Wang
Tue, 23 Aug 22
7/79
Comments: 16 pages, 2 figures