Abstract
The idea that pieces of cosmic strings born in the very early universe became the celestial bodies we now observe suggests a link between the proton lifetime and the Cavendish constant G. A varying G might cause a quick proton decay in hot matter and/or in degenerate matter.
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Massa, C. Cosmic Strings, Varying Gravitational `Constant', and Proton Decay. Astrophysics and Space Science 271, 365–369 (2000). https://doi.org/10.1023/A:1002433213065
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DOI: https://doi.org/10.1023/A:1002433213065