A complex singlet extension of the standard model and multi-critical point principle

We study the Multi-critical Point Principle (MPP) in a complex singlet scalar extension of Standard Model (CxSM). The MPP discussed this selects model parameters so that two low-energy vacua realized by fields are degenerate. further note may inhibit electroweak phase transition (EWPT) certain class models where tree-level potential plays an essential role its realization. Despite that, we show strong first-order EWPT still occurs even after imposing to CxSM due 1-loop corrections new boson. allowed parameter space mass additional is degenerate with Higgs boson, which provides built-in mechanism circumvent constraints from dark matter direct detection experiments. for non-degenerate scenario also studied comparison.