Abstract
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 an 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 find a new window to probe the WHIM properties via the EBL.
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