Fluid equations for fast-moving electroweak bubble walls

  title={Fluid equations for fast-moving electroweak bubble walls},
  author={Benoit Laurent and James M Cline},
  journal={Physical Review D},
The cosmological electroweak phase transition can be strongly first order in extended particle physics models. To accurately predict the speed and shape of the bubble walls during such a transition, Boltzmann equations for the CP-even fluid perturbations must be solved. We point out that the equations usually adopted lead to unphysical behavior of the perturbations, for walls traveling close to or above the speed of sound in the plasma. This is an artifact that can be overcome by more carefully… Expand

Figures and Tables from this paper

Baryogenesis and gravity waves from a UV-completed electroweak phase transition
We study gravity wave production and baryogenesis at the electroweak phase transition, in a real singlet scalar extension of the Standard Model, including vector-like top partners to generate the CPExpand
CP-violating transport theory for Electroweak Baryogenesis with thermal corrections
We derive CP-violating transport equations for fermions for electroweak baryogenesis from the CTP-formalism including thermal corrections at the one-loop level. We consider both the VEV-insertionExpand
Model-independent features of gravitational waves from bubble collisions
We study the gravitational radiation produced by the collisions of bubble walls or thin fluid shells in cosmological phase transitions. Using the so-called envelope approximation, we obtainExpand
On the perturbative expansion at high temperature and implications for cosmological phase transitions
We revisit the perturbative expansion at high temperature and investigate its convergence by inspecting the renormalisation scale dependence of the effective potential. Although at zero temperatureExpand
On the wall velocity dependence of electroweak baryogenesis
We re-evaluate the status of supersonic electroweak baryogenesis using a generalized fluid Ansatz for the non-equilibrium distribution functions. Instead of truncating the expansion to first order inExpand
Bubble wall velocity beyond leading-log approximation in electroweak phase transition
The bubble wall velocity is essential for the phase transition dynamics in the early universe and its cosmological implications, such as the energy budget of phase transition gravitational wave andExpand
Bubble wall velocity: heavy physics effects
We analyse the dynamics of the relativistic bubble expansion during the first order phase transition focusing on the ultra relativistic velocities γ≫ 1. We show that fields much heavier than theExpand
Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies
The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expectedExpand
Wall speed and shape in singlet-assisted strong electroweak phase transitions
Models with singlet fields coupling to the Higgs can enable a strongly first order electroweak phase transition, of interest for baryogenesis and gravity waves. We improve on previous attempts toExpand


How fast can the wall move? A study of the electroweak phase transition dynamics.
  • Moore, Prokopec
  • Physics, Medicine
  • Physical review. D, Particles and fields
  • 1995
It is found that the wall may become supersonic, but not ultrarelativistic, and the wall is thicker than the phase equilibrium value because out of equilibrium particles exert more friction on the back than on the base of a moving wall. Expand
Bubble expansion and the viability of singlet-driven electroweak baryogenesis
A bstractThe standard picture of electroweak baryogenesis requires slowly expanding bubbles. This can be difficult to achieve if the vacuum expectation value (VEV) of a gauge singlet scalar fieldExpand
Electroweak baryogenesis at high bubble wall velocities
It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. We rederiveExpand
Detecting gravitational waves from cosmological phase transitions with LISA: an update
We investigate the potential for observing gravitational waves from cosmological phase transitions with LISA in light of recent theoretical and experimental developments. Our analysis is based onExpand
Bubble wall velocities in the Standard Model and beyond
We present results for the bubble wall velocity and bubble wall thickness during a cosmological first-order phase transition in a condensed form. Our results are for minimal extensions of theExpand
Electroweak bubble wall speed limit
In extensions of the Standard Model with extra scalars, the electroweak phase transition can be very strong, and the bubble walls can be highly relativistic. We revisit our previous argument thatExpand
Science with the space-based interferometer eLISA. II: Gravitational waves from cosmological phase transitions
We investigate the potential for the eLISA space-based interferometer to detect the stochastic gravitational wave background produced by strong first-order cosmological phase transitions. We discussExpand
From Boltzmann equations to steady wall velocities
By means of a relativistic microscopic approach we calculate the expansion velocity of bubbles generated during a first-order electroweak phase transition. In particular, we use the gradientExpand
An efficient approach to electroweak bubble velocities
Extensions of the Standard Model are being considered as viable settings for a first-order electroweak phase transition which satisfy Sakharov's three conditions for the generation of the baryonExpand
Friction forces on phase transition fronts
In cosmological first-order phase transitions, the microscopic interaction of the phase transition fronts with non-equilibrium plasma particles manifests itself macroscopically as friction forces. InExpand