Speaker
Description
The electroweak vacuum, mainly at zero temperature, is investigated as how the quantum fluctuations affect and constrain different beyond Standard Model (BSM) extensions The quantum fluctuations can lead to a second minimum of the potential, which can be a stable global minimum. The Standard Model falls within the possibility of metastability, which means there can be a deeper minimum. Various beyond-standard model scenarios get bounds from the possibilities of vacuum instability or metastability. It has been seen that the extension of the SM with a scalar in general gives more stability to the vacuum, but the scalar quartic couplings get strong bounds from the perturbative unitarity. Different contributions with non-trivial gauge representation can tamper the behaviour of the SM gauge couplings as well, which are also shown explicitly. The LHC phenomenology in these extended scenarios is also discussed.
