2025/05/07 by Dasgupta, Arnab, Knauss, Matthew, Sher, Marc · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2505.04751
The left-right model with the simplest Higgs structure has a SU(2)L doublet HL, a SU(2)R doublet HR, and a singlet σ that couples to the doublets as σ(|HL|2-|HR|2). The left-right symmetry has HL↔ HR and σ↔-σ. We study gravitational wave production and baryogenesis in the electroweak phase transitions in the model. For two benchmark points, σ first gets a vev, followed by HR and then HL. An interesting feature is that the vev of HL is initially much higher than its zero temperature value, leading to a more strongly first-order transition and higher frequency gravitational waves. An unusual benchmark point has the σ vev at zero when the electroweak symmetry breaks. This results in both HL and HR vevs being equal and in the multi-TeV range. At a lower temperature, the σ vev turns on, breaking the left-right symmetry and HL drops to its standard model value. Since the electroweak symmetry is broken at the multi-TeV scale, the frequency of gravitational waves will be much higher than usual. Baryogenesis is also discussed.