Cosmos Broadcasts Radio Mystery

For nearly a decade, astrophysicists have puzzled over an unexplained radiowave radiation emanating from deep space. This mystery was first emphasized by the ARCADE-2 observations published in 2011. The background radio radiation , a counterpart to the famous cosmic background radiation (CBR), is due primarily due to subatomic particles (mostly electrons) spiraling in magnetic fields, which generates radio synchrotron radiation.

The big mystery is the fact that known sources of radio radiation could not account for the synchrotron radio background (SRB), which exceeds the integrated output of known sources by a factor of 5.

The unknown sources of this considerable radio excess would have to meet several criteria. (1) In order to be unobserved directly, the sources would have to produce a low radio flux individually. (2) They would have to be extremely numerous, i.e., orders of magnitude more numerous than all known galaxies. (3) They would require substantial magnetic fields. (4) They would have to deviate from the usual far infrared/radio correlation so as not to overproduce IR radiation. (5) The absence of large background fluctuations requires that the sources are either: at high (but not too high) redshift, not overly clustered, and/or diffuse.

One candidate for the mystery sources provides an interesting and well-motivated solution to the enigma: stellar-mass primordial black holes (PBHs). It is worth noting that they are also well-motivated as candidates for the dark matter that dominates the cosmos.

Details of the RSB mystery can be found at: https://arxiv.org/abs/1911.12881

More on PBHs as dark matter can be found at: https://medium.com/@rloldershaw/new-paper-11-28-17-seven-hints-that-dm-pbhs-ead5f665bda4?

And for deep divers: https://medium.com/@rloldershaw/natures-startling-clue-conformal-symmetry-edited-version-f34e8e627092?