Gravitational wave production and baryogenesis in a simple left-right model
Year: 2025
Type: article
Abstract: The left-right model with the simplest Higgs structure has a S U ( 2 ) L doublet H L , a S U ( 2 ) R doublet H R , and a singlet σ that couples to the doublets as σ ( | H L | 2 − | H R | 2 ) . The left-right symmetry has H L ↔ H R 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 H R and then H L . An interesting feature is that the vev of H L 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 H L and H R vevs being equal and in the multi-TeV range. At a lower temperature, the σ vev turns on, breaking the left-right symmetry and H L 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.
DOI: 10.1103/x9v8-b1j4
Authors: Arnab Dasgupta, Matthew Knauss, Marc Sher
Institutions: University of Pittsburgh, William & Mary
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4414489462