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    Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter

    Access Status
    Fulltext not available
    Authors
    Porayko, N.
    Zhu, X.
    Levin, Y.
    Hui, L.
    Hobbs, G.
    Grudskaya, A.
    Postnov, K.
    Bailes, M.
    Bhat, Ramesh
    Coles, W.
    Dai, S.
    Dempsey, J.
    Keith, M.
    Kerr, M.
    Kramer, M.
    Lasky, P.
    Manchester, R.
    Oslowski, S.
    Parthasarathy, A.
    Ravi, V.
    Reardon, D.
    Rosado, P.
    Russell, C.
    Shannon, Ryan
    Spiewak, R.
    Van Straten, W.
    Toomey, L.
    Wang, J.
    Wen, L.
    You, X.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Porayko, N. and Zhu, X. and Levin, Y. and Hui, L. and Hobbs, G. and Grudskaya, A. and Postnov, K. et al. 2018. Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter. Physical Review D. 98 (10): Article ID 102002.
    Source Title
    Physical Review D
    DOI
    10.1103/PhysRevD.98.102002
    ISSN
    2470-0010
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/74432
    Collection
    • Curtin Research Publications
    Abstract

    t is widely accepted that dark matter contributes about a quarter of the critical mass-energy density in our Universe. The nature of dark matter is currently unknown, with the mass of possible constituents spanning nearly one hundred orders of magnitude. The ultralight scalar field dark matter, consisting of extremely light bosons with m~10-22 eV and often called "fuzzy" dark matter, provides intriguing solutions to some challenges at sub-Galactic scales for the standard cold dark matter model. As shown by Khmelnitsky and Rubakov, such a scalar field in the Galaxy would produce an oscillating gravitational potential with nanohertz frequencies, resulting in periodic variations in the times of arrival of radio pulses from pulsars. The Parkes Pulsar Timing Array (PPTA) has been monitoring 20 millisecond pulsars at two- to three-week intervals for more than a decade. In addition to the detection of nanohertz gravitational waves, PPTA offers the opportunity for direct searches for fuzzy dark matter in an astrophysically feasible range of masses. We analyze the latest PPTA data set which includes timing observations for 26 pulsars made between 2004 and 2016. We perform a search in this data set for evidence of ultralight dark matter in the Galaxy using Bayesian and Frequentist methods. No statistically significant detection has been made. We, therefore, place upper limits on the local dark matter density. Our limits, improving on previous searches by a factor of 2 to 5, constrain the dark matter density of ultralight bosons with m=10-23 eV to be below 6 GeV cm-3 with 95% confidence in the Earth neighborhood. Finally, we discuss the prospect of probing the astrophysically favored mass range m10-22 eV with next-generation pulsar timing facilities.

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