  Matrix quantum mechanics offers an attractive environment for discussing
gravitational holography, in which both sides of the holographic duality are
well-defined. Similarly to higher-dimensional implementations of holography,
collapsing shell solutions in the gravitational bulk correspond in this setting
to thermalization processes in the dual quantum mechanical theory. We construct
an explicit, fully nonlinear supergravity solution describing a generic
collapsing dilaton shell, specify the holographic renormalization prescriptions
necessary for computing the relevant boundary observables, and apply them to
evaluating thermalizing two-point correlation functions in the dual matrix
theory.
