An Effective Field Theory for large oscillons

A bstract We consider oscillons — localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. develop their effective description the limit of large size at finite field strength. Namely, we note that nonlinear long-range configurations can be described by an complex ψ ( t, x ) which is related to original fields a canonical transformation. The action for has form systematic gradient expansion. At every order expansion, such theory global U(1) symmetry hence family stationary nontopological solitons oscillons. decay latter objects nonperturbative process from viewpoint theory. Our approach gives intuitive understanding full nonlinearity explains longevity. Importantly, it also provides reliable selection criteria long-lived This technique more precise nonrelativistic limit, notable cases nonlinear, long-lived, objects, lower spatial dimensions. test performing explicit numerical simulations d + 1)-dimensional plateau potential.