Summary
The very recent measurements on the ratio of cosmic antiproton to proton have contradicted seriously the previous measurements of the same for low-energy antiprotons. The controversial situation has been described and its implication for the validity of the postulate about the existence of antigalaxy has been examined. Although a very decisive conclusion cannot yet be made, a two-component behaviour of the ratio cannot, however, be excluded. Moreover, this two-component proposition seems to have better prospectsvis-a-vis the high-energy measurements of the ratio.
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Bhattacharyya, S. Is there an antimatter-universe or antigalaxy?. Il Nuovo Cimento C 11, 443–446 (1988). https://doi.org/10.1007/BF02533137
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DOI: https://doi.org/10.1007/BF02533137