Newton-Cartan $D 0$ branes from $D1$ branes and integrability

We explore analytic integrability criteria for $D1$ branes probing 4D relativistic background with a null isometry direction. We use both the Kovacic's algorithm of classical (non)integrability as well as the standard formulation of Lax connections to show the analytic integrability of the associated dynamical configuration. We further use the notion of double null reduction and obtain the world-volume action corresponding to a torsional Newton-Cartan (TNC) $D0$ brane probing a 3D torsional Newton-Cartan geometry. Moreover, following Kovacic's method, we show the classical integrability of the TNC $D0$ brane configuration thus obtained. Finally, considering a trivial field redefinition for the $D1$ brane world-volume fields, we show the equivalence between two configurations in the presence of vanishing NS fluxes.

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