  Gradient descent dynamics in complex energy landscapes, i.e. featuring
multiple minima, finds application in many different problems, from soft matter
to machine learning. Here, we analyze one of the simplest examples, namely that
of soft repulsive particles in the limit of infinite spatial dimension $d$. The
gradient descent dynamics then displays a jamming transition: at low density,
it reaches zero-energy states in which particles' overlaps are fully
eliminated, while at high density the energy remains finite and overlaps
persist. At the transition, the dynamics becomes critical. In the $d\to \infty$
limit, a set of self-consistent dynamical equations can be derived via mean
field theory. We analyze these equations and we present some partial progress
towards their solution. We also study the Random Lorentz Gas in a range of
$d=2\ldots 22$, and obtain a robust estimate for the jamming transition in
$d\to\infty$. The jamming transition is analogous to the capacity transition in
supervised learning, and in the appendix we discuss this analogy in the case of
a simple one-layer fully-connected perceptron.
