Kavli Affiliate: Marcela Carena
| First 5 Authors: Marcela Carena, Aurora Ireland, Tong Ou, Isaac R. Wang,
| Summary:
A precise determination of the bubble wall velocity $v_w$ is crucial for
making accurate predictions of the baryon asymmetry and gravitational wave (GW)
signals in models of electroweak baryogenesis (EWBG). Working in the local
thermal equilibrium approximation, we exploit entropy conservation to present
efficient algorithms for computing $v_w$, significantly streamlining the
calculation. We then explore the parameter dependencies of $v_w$, focusing on
two sample models capable of enabling a strong first-order electroweak phase
transition: a $mathbb{Z}_2$-symmetric singlet extension of the SM, and a model
for baryogenesis with CP violation in the dark sector. We study correlations
among $v_w$ and the two common measures of phase transition strength,
$alpha_n$ and $v_n/T_n$. Interestingly, we find a relatively model-insensitive
relationship between $v_n/T_n$ and $alpha_n$. We also observe an upper bound
on $alpha_n$ for the deflagration/hybrid wall profiles naturally compatible
with EWBG, the exact value for which varies between models, significantly
impacting the strength of the GW signals. In summary, our work provides a
framework for exploring the feasibility of EWBG models in light of future GW
signals.
| Search Query: ArXiv Query: search_query=au:”Marcela Carena”&id_list=&start=0&max_results=3