Bubble dynamics in fluids with N-body simulations

Understand

We present a new approach to studies of bubble dynamics in fluids.

• Relying on particle-based simulations, this method is general and suitable for cases where the commonly used perfect fluid description fails.
• We study expanding true vacuum bubbles surrounded by free or self-interacting particles and quantify how self-interactions affect the terminal bubble wall velocity.
• We find that, for sufficiently strongly self-interacting fluids, local thermal equilibrium is maintained around the bubble wall and the fluid profile is similar to that obtained with the perfect fluid description.