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Pulsar Timing Probes of Primordial Black Holes and Subhalos

Dror, Jeff A. and Ramani, Harikrishnan and Trickle, Tanner and Zurek, Kathryn M. (2019) Pulsar Timing Probes of Primordial Black Holes and Subhalos. . (Unpublished)

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Pulsars act as accurate clocks, sensitive to gravitational redshift and acceleration induced by transiting clumps of matter. We study the sensitivity of pulsar timing arrays (PTAs) to single transiting compact objects, focusing on primordial black holes and compact subhalos in the mass range from 10^(-12) M_⊙ to well above 100 M_⊙. We find that the Square Kilometer Array can constrain such objects to be a subdominant component of the dark matter over this entire mass range, with sensitivity to a dark matter sub-component reaching the sub-percent level over significant parts of this range. We also find that PTAs offer an opportunity to probe substantially less dense objects than lensing because of the large effective radius over which such objects can be observed, and we quantify the subhalo concentration parameters which can be constrained.

Item Type:Report or Paper (Discussion Paper)
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Additional Information:We thank Adrienne Erickcek, Andrey Katz, Joachim Kopp, Vikram Ravi, Katelin Schutz, Sergei Sibiryakov, Wei Xue, Xingjiang Zhu, and Miguel Zumalacarregui for useful discussions. We especially thank Stephen Taylor for extensive discussions and collaboration during early parts of this work. JD, HR, TT and KZ are supported in part by the DOE under contract DE-AC02-05CH11231. KZ thanks the CERN theory group for hospitality for the duration of this work. Some of this work was also completed at KITP, supported in part by NSF Grant No. NSF PHY-1748958, and at the Aspen Center for Physics, which is supported by NSF grant PHY-1607611.
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Department of Energy (DOE)DE-AC02-05CH11231
Record Number:CaltechAUTHORS:20190612-134942059
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96337
Deposited By: Tony Diaz
Deposited On:12 Jun 2019 20:54
Last Modified:12 Jun 2019 20:54

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