A New Source of Phase Transition Gravitational Waves: Heavy Particle Braking Across Bubble Walls
arXiv:2508.04314 · doi:10.1007/JHEP02(2026)112
Abstract
Motivated by the new heavy dark matter production mechanism from cosmic phase transition, we propose a novel mechanism for the generation of microscopic gravitational waves (GWs) during cosmological first-order phase transitions arising from the braking of heavy particles as they traverse bubble walls. Unlike the well-known sources such as bubble collisions, sound waves, or turbulence in the plasma, this mechanism originates from the direct interaction between massive particles and the expanding bubble wall. We use quantum field theory to rigorously compute the gravitational radiation. The resulting GW spectrum exhibits distinctive features: The peak frequency is tightly correlated with the bubble wall velocity, while the peak amplitude scales as the fourth power of the heavy particle mass. These unique dependencies offer a new observational handle on particle physics beyond the Standard Model. We illustrate this mechanism within a specific model framework and demonstrate its viability. Our findings enrich the landscape of phase transition GW sources and open new avenues for more directly probing heavy particle dynamics and new physics models in the early universe.
Published version at JHEP; 44 pages, 7 figures 1 table
References in corpus (39)
- Gravitational Wave Production by Collisions: More Bubbles
- Gravitational wave energy budget in strongly supercooled phase transitions
- On Effective Degrees of Freedom in the Early Universe
- Gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source
- Towards an all-orders calculation of the electroweak bubble wall velocity
- Friction pressure on relativistic bubble walls
- Bubble wall velocity: heavy physics effects
- Gravitational Waves as a Big Bang Thermometer
- Gravitational Effects on Inflaton Decay
- Fermi-ball dark matter from a first-order phase transition
- GUT-Scale Primordial Black Holes: Consequences and Constraints
- From Boltzmann equations to steady wall velocities
- Gravitational wave background from Standard Model physics: Complete leading order
- Electroweak bubble wall expansion: gravitational waves and baryogenesis in Standard Model-like thermal plasma
- Bubble wall velocities in local equilibrium
- Baryogenesis and gravity waves from a UV-completed electroweak phase transition
- Relic gravitational waves from light primordial black holes
- Field-theoretic derivation of bubble-wall force
- Model-independent bubble wall velocities in local thermal equilibrium
- On gravitational and thermal corrections to vacuum decay
- Fluid equations for fast-moving electroweak bubble walls
- Electromagnetic Antennas for the Resonant Detection of the Stochastic Gravitational Wave Background
- Probing the baryogenesis and dark matter relaxed in phase transition by gravitational waves and colliders
- Leptogenesis triggered by a first-order phase transition
- Bubble wall dynamics at the electroweak phase transition
- Cosmological bubble friction in local equilibrium
- Primordial Gravitational Waves From Black Hole Evaporation in Standard and Non-Standard Cosmologies
- Gravitational Wave from Graviton Bremsstrahlung during Reheating
- Quantisation Across Bubble Walls and Friction
- Wall speed and shape in singlet-assisted strong electroweak phase transitions
- Implication of nano-Hertz stochastic gravitational wave on dynamical dark matter through a dark first-order phase transition
- The Supercooling Window at Weak and Strong Coupling
- Bubble wall velocity during electroweak phase transition in the inert doublet model
- Hydrodynamic backreaction force of cosmological bubble expansion
- Bounds on the bubble wall velocity
- Gravitational Wave Sourced by Decay of Massive Particle from Primordial Black Hole evaporation
- Gauged Q-ball dark matter through a cosmological first-order phase transition
- Hydrodynamic effects on the filtered dark matter produced by a first-order phase transition
- Non-thermal production of heavy vector dark matter from relativistic bubble walls