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Observability of dark matter substructure with pulsar timing correlations

Ramani, Harikrishnan and Trickle, Tanner and Zurek, Kathryn M. (2020) Observability of dark matter substructure with pulsar timing correlations. Journal of Cosmology and Astroparticle Physics, 2020 (12). Art. No. 33. ISSN 1475-7516. doi:10.1088/1475-7516/2020/12/033.

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Dark matter substructure on small scales is currently weakly constrained, and its study may shed light on the nature of the dark matter. In this work we study the gravitational effects of dark matter substructure on measured pulsar phases in pulsar timing arrays (PTAs). Due to the stability of pulse phases observed over several years, dark matter substructure around the Earth-pulsar system can imprint discernible signatures in gravitational Doppler and Shapiro delays. We compute pulsar phase correlations induced by general dark matter substructure, and project constraints for a few models such as monochromatic primordial black holes (PBHs), and Cold Dark Matter (CDM)-like NFW subhalos. This work extends our previous analysis, which focused on static or single transiting events, to a stochastic analysis of multiple transiting events. We find that stochastic correlations, in a PTA similar to the Square Kilometer Array (SKA), are uniquely powerful to constrain subhalos as light as ~ 10⁻¹³ M⊙, with concentrations as low as that predicted by standard CDM.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ramani, Harikrishnan0000-0003-3804-8598
Trickle, Tanner0000-0003-1371-4988
Zurek, Kathryn M.0000-0002-2629-337X
Additional Information:© 2020 IOP Publishing Ltd and Sissa Medialab. Received 22 May 2020; Accepted 25 October 2020; Published 17 December 2020. We thank Nikita Blinov and Jeff Dror for useful discussions, and Steve Taylor and Michele Vallisneri for discussions on the NANOGrav data and analysis. H.R. is supported in part by the DOE under contract DE-AC02-05CH11231. Some of this work was done at the Aspen Center for Physics, which is supported by NSF grant PHY-1607611 and at KITP, supported in part by the National Science Foundation under Grant No. NSF PHY-1748958. T.T. would like to thank the Walter Burke Institute for Theoretical Physics for hospitality during the completion of this work.
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:12
Record Number:CaltechAUTHORS:20200804-084020652
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Official Citation:Harikrishnan Ramani et al JCAP12(2020)033
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104716
Deposited By: Tony Diaz
Deposited On:04 Aug 2020 16:58
Last Modified:12 Jul 2022 17:33

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