Bubbletrons: Ultrahigh-Energy Particle Collisions and Heavy Dark Matter at Phase Transitions

Abstract

We initiate the study of `bubbletrons', by which we mean ultra-high-energy collisions of the particle shells that generically form at the walls of relativistic bubbles in cosmological first-order phase transitions (PT). As an application, we calculate the maximal dark matter mass $M_{DM}$ that bubbletrons can produce in a $U(1)$ gauge PT, finding $M_{DM}\sim 10^5/10^{11}/10^{15}$ GeV for PT scales $v_{\varphi }\sim 10^{-2}/10^3/10^9$ GeV. Bubbletrons realise a novel link between ultra-high-energy phenomena and gravitational waves (GW) sourced at the PT, from nanohertz to megahertz frequencies.

arXiv comment5 pages plus references, 5 figures. v2: clarifications added, including a comparison with particle production from bubble collisions. Published in PRL

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• Reheating after the Supercooled Phase Transitions with Radiative Symmetry Breaking
• Gravitational waves from the sound shell model: direct and inverse phase transitions in the early Universe