The Modified Camassa--Holm Equation with Step-Like Boundary Conditions: A Characterization of Existence

We consider the Cauchy problem for the modified Camassa-Holm equation \[ u_t+\left((u^2-u_x^2)m\right)_x=0,\quad m:= u-u_{xx}, \quad t>0,\ \ -\infty<x<+\infty \] subject to the step-like initial data: $u(x,0)\to A_1$ as $x\to-\infty$ and $u(x,0)\to A_2$ as $x\to+\infty$, where $0<A_1<A