= Bar-halo angular-momentum transfer
Exchange of <angular momentum> between a <stellar bar> and a <dark matter halo> through orbital <resonances>. If the unperturbed halo <distribution function> depends only on <energy> and decreases with it, the <resonant torque from a rotating perturbation> is nonnegative for positive pattern <angular velocity>. Strict transfer requires nonzero resonant overlap. The reaction <torque> slows a rigid bar of constant positive <moment of inertia>; evolving bar structure and halo redistribution require updating the response.
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