Lattice study of disordering of inhomogeneous condensates and the Quantum Pion Liquid in effective $O(N)$ model

In this talk, we study a scalar $O(N)$ model with a so-called moat regime – a regime with negative bosonic wave function renormalization – using lattice field theory. For negative bare wave function renormalization, inhomogeneous condensates are solutions of the classical equations of motions. Using hybrid Monte Carlo simulations we demonstrate how bosonic quantum fluctuations disorder the inhomogeneous condensate. Instead, one finds a so-called Quantum Pion Liquid, where bosonic correlation functions are spatially oscillating, but also exponentially decaying.