Non-Riemannian gravity actions from double field theory

A bstract Non-Riemannian gravitational theories suggest alternative avenues to understand properties of quantum gravity and provide a concrete setting study condensed matter systems with non-relativistic symmetry. Derivation an action principle for these generally proved challenging various reasons. In this technical note, we employ the formulation double field theory construct actions variety such theories. This helps removing ambiguities in corresponding equations motion. particular, embed Torsional Newton-Cartan gravity, Carrollian String theory, derive their compare previously obtained results literature.