  We study cosmological gravitational particle production as applied to
"rapid-turn" models of inflation involving two scalar fields. We are interested
in the production of massive spin-0 particles that only interact
gravitationally and provide a candidate for the dark matter. Specifically, we
study two models of rapid-turn multifield inflation, motivated in part by the
de Sitter swampland conjecture, that are distinguished by the curvature of
field space and the presence or absence of field space 'angular momentum'
conservation. We find that one of these models leads to insufficient particle
production and cannot explain the observed dark matter relic abundance. The
second model is able to explain the origin of spin-0 dark matter via
gravitational production, and we identify the relevant region of parameter
space that is consistent with measurements of the dark-matter relic abundance,
the dark-matter-photon isocurvature perturbations, and the spectrum of
curvature perturbations that is probed by cosmological observations. Our work
demonstrates the compatibility of the de Sitter swampland conjecture with
completely dark matter.
