Particle production from bubble collisions
Anish Ghoshal Pratyay Pal Alessandro Strumia
作者信息
Abstract
Collisions of ultra-relativistic bubbles during cosmological phase transitions can produce particles much heavier than the transition scale. Previous analyses modelled this process as the off-shell decay of the scalar background. We show that its results parametrically overestimate hard particle production and depend on the gauge choice and the coordinate choice in field space. We propose an alternative formalism, analogous to the partonic description of high-energy collisions. In the ultra-relativistic limit, the colliding bubbles undergo nearly free passage and hard production arises from on-shell scatterings among the quanta constituting the Lorentz-contracted walls. We apply this approach to heavy scalar, fermion, and vector particle production, and study the implications for dark matter, leptogenesis, graviton production and primordial gravitational waves.引用本文复制引用
Anish Ghoshal,Pratyay Pal,Alessandro Strumia.Particle production from bubble collisions[EB/OL].(2026-07-16)[2026-07-20].https://arxiv.org/abs/2607.15279.学科分类
物理学
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