Bubble wall velocities with an extended fluid Ansatz

GC Dorsch, DA Pinto - Journal of Cosmology and Astroparticle …, 2024 - iopscience.iop.org
We compute the terminal bubble wall velocity during a cosmological phase transition by
modelling non-equilibrium effects in the plasma with the so-called" extended fluid Ansatz". A …

Criterion for ultra-fast bubble walls: the impact of hydrodynamic obstruction

WY Ai, X Nagels, M Vanvlasselaer - Journal of Cosmology and …, 2024 - iopscience.iop.org
The Bödeker-Moore thermal friction [1] is usually used to determine whether or not a bubble
wall can run away. However, the friction on the wall is not necessarily a monotonous …

Non-linearities in cosmological bubble wall dynamics

S De Curtis, LD Rose, A Guiggiani, ÁG Muyor… - Journal of High Energy …, 2024 - Springer
A bstract 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 …

General backreaction force of cosmological bubble expansion

JC Wang, ZY Yuwen, YS Hao, SJ Wang - Physical Review D, 2024 - APS
The gravitational-wave energy-density spectra from cosmological first-order phase
transitions crucially depend on the terminal wall velocity of asymptotic bubble expansion …

Fate of oscillating homogeneous ℤ2-symmetric scalar condensates in the early Universe

WY Ai, ZL Wang - Journal of Cosmology and Astroparticle …, 2024 - iopscience.iop.org
Dark matter, if represented by a Bbb Z 2-symmetric scalar field, can manifest as both
particles and condensates. In this paper, we study the evolution of an oscillating …

Bubble wall velocity from number density current in (non) equilibrium

ZY Yuwen, JC Wang, SJ Wang - arXiv preprint arXiv:2409.20045, 2024 - arxiv.org
Cosmological first-order phase transitions (FOPTs) serve as comprehensive probes into our
early Universe with associated generations of stochastic gravitational waves and …

Primordial black holes from an aborted phase transition

WY Ai, L Heurtier, TH Jung - arXiv preprint arXiv:2409.02175, 2024 - arxiv.org
We propose a new mechanism of primordial black hole formation via an aborted phase
transition during the early matter-dominated stage of reheating after inflation. In reheating …

Non-thermal production of heavy vector dark matter from relativistic bubble walls

WY Ai, M Fairbairn, K Mimasu, T You - arXiv preprint arXiv:2406.20051, 2024 - arxiv.org
Heavy vector boson dark matter at the TeV scale or higher may be produced non-thermally
in a first-order phase transition taking place at a lower energy scale. While the production of …

[PDF][PDF] Ultrarelativistic Phase Transition in the early Universe: The faster the better

G Barni - 2024 - tesidottorato.depositolegale.it
Our understanding of the Universe, particularly its earliest moments, is grounded in two
fundamental pillars of theoretical physics: General Relativity (GR) and the Standard Model …