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In a recent Letter, an excess of 511 keV radiation from positron annihilation from the centre of the Galaxy was proposed to explain by the decay of the protons falling onto Sgr A ⁎ while interpreting Sgr A ⁎ as a gravitational vacuum star. In the present Letter, this explanation is considered in view of the constraints imposed by the accretion rate onto Sgr A ⁎ and the observed...
Tau lepton emission in two-nucleon disappearance reactions from within nuclei which conserve baryon number minus lepton number (B − L) is considered. It is shown that some existing limits on proton decay channels and two-nucleon disappearance reactions resulting in electrons and muons can be applied to ΔB=ΔL=2 decays involving τ leptons. For the two-nucleon disappearance channel np→τ+ν‾τ the estimated...
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