English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We calculate the friction experienced by ultrarelativistic bubble wallsresulting from the $1 \rightarrow 2$ light-to-heavy transition process, withfinite-wall-width effects fully taken into account. In this process, the lightparticle is excited from the order-parameter scalar field, while the two heavyparticles are excitations of a dark matter scalar field. Unlike earlierestimates suggesting a friction scaling as $\gamma_w^0$, where $\gamma_w$represents the Lorentz factor of the wall velocity, our more precise numericalanalysis reveals a logarithmic dependence of the friction on $\gamma_w$. Weoffer a numerical fit to capture this frictional pressure accurately. Ouranalysis verifies that the friction stemming from the $1 \rightarrow 2$light-to-heavy transition is typically much smaller than the friction from the$1 \rightarrow 1$ transmission of the dark matter particles.

Logarithmically divergent friction on ultrarelativistic bubble walls