Constant-velocity spherical bubble walls radiate massive scalars until the wall's rest-frame curvature exceeds the particle Compton wavelength, a mechanism that can dominate freeze-in production of axion-like particles.
Particle production in field theories coupled to strong external sources. II: Generating functions
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We discuss a method for computing the generating function for the multiplicity distribution in field theories with strong time dependent external sources. At leading order, the computation of the generating function reduces to finding a pair of solutions of the classical equations of motion, with non-standard temporal boundary conditions.
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Abundant production of scalars and axions from phase transition bubble expansion
Constant-velocity spherical bubble walls radiate massive scalars until the wall's rest-frame curvature exceeds the particle Compton wavelength, a mechanism that can dominate freeze-in production of axion-like particles.