There is a third possibility – that Va’vra is measuring something completely different… since as I recall, he is trying to explain a phenomenon of the Milky Way, and the others who see emissions from distant galaxies in the range of 3.5 keV are seeing a characteristic emission of dark matter which is far removed.
The emission line which they see (5 or 6 different papers) is red-shifted, but is not clear if the originating radiation is 3.7 keV or not. At any rate it is NOT as Mills suggests, the 3.4 keV which he calculates, since the red-shift would lower that. So we know that Mills is wrong, if nothing else as his value is lower than what is actually seen, when it should be higher. The fourth possibility is the most likely. Va’vra is seeing positron annihilation, which he tries to marginalize as a possibility, but it is too coincidental to be otherwise. From: Eric Walker Just one point of detail -- I read Va'vra as saying that if you sum all of the photon energies from a hydrogen atom going to DDL across a full solid angle, this will add up to 511 keV. Looking at the 2013 paper again, that is just one of two possibilities. One possibility is that the DDL gives off a 511 keV emission (explaining the signal in the cosmic background) and the other is that the DDL emissions sum up over a solid angle (not explaining the signal, presumably) [1]. He does something similar with the capture cross section of DDL hydrogen -- it might or might not be all that high (p. 6). Eric [1] http://arxiv.org/pdf/1304.0833v3.pdf, p. 5
