What hypothetical process, supported by some Grand Unified Theories, could lead to the disintegration of baryonic matter during the Degenerate Era?

Answer

Proton decay

If true, proton decay would cause the remaining stellar remnants (white dwarfs, neutron stars) to slowly break down into fundamental particles and photons over extremely long timescales.

What hypothetical process, supported by some Grand Unified Theories, could lead to the disintegration of baryonic matter during the Degenerate Era?
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