There is no way anyone would miss the radiation emitted though. It would be, at a minimum, a very perceptible ‘glow’ over the volumes of space we’re talking about.
It's not ruled out by evidence, AFAIK, and could explain some observational puzzles.
https://indico.fnal.gov/event/6199/contributions/94686/attac...
(that was 2013; perhaps observations since have made it less likely)
2021 paper: https://arxiv.org/abs/2105.08719
2020 paper: https://www.researchgate.net/publication/342573954_Antimatte... ("a large region of the parameter space remains unconstrained, most notably for nuclear-dense objects.")
It's not ruled out by evidence, AFAIK, and could explain some observational puzzles.
https://indico.fnal.gov/event/6199/contributions/94686/attac...
(that was 2013; perhaps observations since have made it less likely)
2021 paper: https://arxiv.org/abs/2105.08719
2020 paper: https://www.researchgate.net/publication/342573954_Antimatte... ("a large region of the parameter space remains unconstrained, most notably for nuclear-dense objects.")