Traditionally, scalar ϕ 4 theory in four dimensions is thought to be quantum trivial in the
continuum. This tradition is apparently well grounded both in physics arguments and …

Ordinary Hermitian λ ϕ 4 theory is known to exist in d< 4 dimensions when λ> 0. For
negative values of the coupling, it has been suggested that a physical meaningful definition …

We consider exact Wentzel-Kramers-Brillouin analysis to a PT symmetric quantum
mechanics defined by the potential, V (x)= ω 2 x 2+ gx 2 (ix) ϵ= 2 with ω∈ R≥ 0, g∈ R> 0 …

We study the full phase diagram of a non-Hermitian PT-symmetric generalization of the
paradigmatic two-dimensional massive Thirring model. Employing the nonperturbative …

In the present work we set up a general functional renormalisation group framework for the
computation of complex effective actions. For explicit computations we consider both flows of …

The critical point of a topological phase transition is described by a conformal field theory
(CFT), where the finite-size corrections to the ground state energy are uniquely related to its …

The non-Hermitian dynamics of open systems deal with how intricate coherent effects of a
closed system intertwine with the impact of coupling to an environment. The system …