Nonlocalized damping estimates for hyperbolic systems of balance laws in one space dimension
In this paper, we present a new approach to obtain so-called damping estimates for self-similar solutions to general hyperbolic relaxation systems. Such damping estimates are an important part of the stability theory of relaxation profiles with and without subshock where they enable the closure of nonlinear stability arguments. We extend the damping estimates obtained in Mascia and Zumbrun (2005) and Yang and Zumbrun (2020) from the $L^2$-case to the $L^\infty$-case and, at the same time, generalize the $L^2$-estimates to the general non-symmetric setting. Compared to previous deductions of damping estimates, the method chosen here is considerably simpler and avoids delicate Kawashima-type estimates (Mascia and Zumbrun (2005) and Yang and Zumbrun (2020)) and the use of pseudo-differential calculus (Zumbrun 2026). The novel nonlocalized damping estimates open the door to a general stability theory of shock profiles of hyperbolic relaxation systems under nonlocalized perturbations in one space dimension.