The bare mass is the mass parameter in a regulated field-theory action before a renormalization condition relates it to a measured mass. For a scalar, loop self-energy corrections change the propagator denominator to . The pole mass solves for a stable particle. The bare mass generally depends on the regulator when the pole mass is held fixed.
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Bare mass refers to the intrinsic mass of a particle, such as an electron or a quark, that does not take into account the effects of interactions with other fields or particles. In quantum field theory, particles interact with their surrounding fields, which can alter their effective mass through various mechanisms, such as the Higgs mechanism. The bare mass is a theoretical concept that serves as a starting point in calculations, while the observed or effective mass can differ due to these interactions.