Parabolic Minkowski convolutions of viscosity solutions to fully nonlinear equations

This paper is concerned with the Minkowski convolution of viscosity solutions of fully nonlinear parabolic equations. We adopt this convolution to compare viscosity solutions of initial-boundary value problems in different domains. As a consequence, we can for instance obtain parabolic power concavity of solutions to a general class of parabolic equations. Our results apply to the Pucci operator, the normalized $q$-Laplacians with $1<q\le \mathrm{\infty }$, the Finsler Laplacian and more general quasilinear operators.