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Pulsars act as accurate clocks, sensitive to gravitational redshift andacceleration induced by transiting clumps of matter. We study the sensitivityof pulsar timing arrays (PTAs) to single transiting compact objects, focusingon primordial black holes and compact subhalos in the mass range from $10^{-12}M _{\odot}$ to well above $100~M_\odot$. We find that the Square KilometerArray can constrain such objects to be a subdominant component of the darkmatter over this entire mass range, with sensitivity to a dark mattersub-component reaching the sub-percent level over significant parts of thisrange. We also find that PTAs offer an opportunity to probe substantially lessdense objects than lensing because of the large effective radius over whichsuch objects can be observed, and we quantify the subhalo concentrationparameters which can be constrained.

Pulsar Timing Probes of Primordial Black Holes and Subhalos