2025/06/11 by Mirbabayi, Mehrdad, Villadoro, Giovanni
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2506.09842
Sometimes a local minimum is known to be a metastable vacuum inside the low-energy EFT, but the true vacuum lies outside, and the bounce solution mediating the decay cannot be found. For single-field decay, Espinosa has proposed a family of configurations called ``pseudo-bounces'' as a way to constrain the decay rate. They are parametrized by the central field value Φ0 and constructed without the knowledge of the true vacuum. We prove that the pseudo-bounce family has a monotonically decreasing decay exponent whose end point and minimum is the bounce action, and this continues to hold when gravitational effects are non-negligible. We then use this to estimate the decay rate (in the radion direction) of the promised AdS3 vacuum of the Standard Model.