Results 61 to 70 of about 23,762 (159)

Non-linearities in cosmological bubble wall dynamics

Journal of High Energy Physics
A precise modelling of the dynamics of bubbles nucleated during first-order phase transitions in the early Universe is pivotal for a quantitative determination of various cosmic relics, including the stochastic background of gravitational waves.
Stefania De Curtis, Luigi Delle Rose, Andrea Guiggiani, Ángel Gil Muyor, Giuliano Panico   +4 more
doaj   +1 more source

Bubble friction in symmetry-restoring transitions

Journal of High Energy Physics
In standard (symmetry-breaking) first-order phase transitions, the frictional pressure on expanding bubble walls can be dominated by transition radiation — the emission of a gauge boson with phase-dependent masses as particles present in the thermal ...
Andrew J. Long, Bibhushan Shakya, Julia Anabell Ziegler   +2 more
doaj   +1 more source

From friction scaling to an efficient method for estimating bubble wall velocity

Journal of High Energy Physics
We present a unified description of first-order cosmological phase transition dynamics that links the phenomenological friction model employed in hydrodynamic simulations to the microscopic treatment based on Boltzmann equations. We derive an approximate
Tomasz Krajewski, Marek Lewicki, Marco Merchand, Ignacy Nałęcz, Mateusz Zych   +4 more
doaj   +1 more source

Bounds on the bubble wall velocity

Journal of High Energy Physics
Determining the bubble wall velocity in first-order phase transitions is a challenging task, requiring the solution of (coupled) equations of motion for the scalar field and Boltzmann equations for the particles in the plasma.
Wen-Yuan Ai, Benoit Laurent, Jorinde van de Vis   +2 more
doaj   +1 more source

Super-slow phase transition catalyzed by BHs and the birth of baby BHs

Physics Letters B
We discuss the unique phenomenology of first-order phase transitions catalyzed by primordial black holes (BHs). If the number of BHs within one Hubble volume is smaller than unity at the time of bubble nucleation, each bubble catalyzed around them can ...
Ryusuke Jinno, Jun'ya Kume, Masaki Yamada   +2 more
doaj   +1 more source

Particle shells from relativistic bubble walls

Journal of High Energy Physics
Relativistic bubble walls from cosmological phase transitions (PT) necessarily accumulate expanding shells of particles. We systematically characterize shell properties, and identify and calculate the processes that prevent them from free streaming ...
Iason Baldes, Maximilian Dichtl, Yann Gouttenoire, Filippo Sala   +3 more
doaj   +1 more source

The Optically Thick Rotating Magnetic Wind from a Massive White Dwarf Merger Product. II. Axisymmetric Magnetohydrodynamic Simulations

The Astrophysical Journal
We numerically construct a series of axisymmetric rotating magnetic wind solutions, aiming at exploring the observation properties of massive white dwarf (WD) merger remnants with a strong magnetic field, a fast spin, and an intense mass loss, as ...
Yici Zhong, Kazumi Kashiyama, Shinsuke Takasao, Toshikazu Shigeyama, Kotaro Fujisawa   +4 more
doaj   +1 more source

How fast does the WallGo? A package for computing wall velocities in first-order phase transitions

Journal of High Energy Physics
WallGo is an open-source software designed to compute the bubble wall velocity in first-order cosmological phase transitions. Additionally, it evaluates the energy budget available for generating gravitational waves.
Andreas Ekstedt, Oliver Gould, Joonas Hirvonen, Benoit Laurent, Lauri Niemi, Philipp Schicho, Jorinde van de Vis   +6 more
doaj   +1 more source

Steady-state bubbles beyond local thermal equilibrium

Journal of High Energy Physics
We investigate the hydrodynamic solutions for expanding bubbles in cosmological first-order phase transitions going beyond local thermal equilibrium approximation.
Tomasz Krajewski, Marek Lewicki, Ignacy Nałęcz, Mateusz Zych   +3 more
doaj   +1 more source

WallGo investigates: Theoretical uncertainties in the bubble wall velocity

Journal of High Energy Physics
We examine theoretical uncertainties in state-of-the-art calculations of the bubble wall velocity during first-order cosmological phase transitions.
Jorinde van de Vis, Philipp Schicho, Lauri Niemi, Benoit Laurent, Joonas Hirvonen, Oliver Gould   +5 more
doaj   +1 more source