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  • Letter

Constraining ultralight vector dark matter with the Parkes Pulsar Timing Array second data release

Yu-Mei Wu1,2,3,*, Zu-Cheng Chen4,5,†, Qing-Guo Huang1,3,2,‡, Xingjiang Zhu5,§, N. D. Ramesh Bhat6, Yi Feng7, George Hobbs8, Richard N. Manchester8, Christopher J. Russell9 et al. (PPTA Collaboration)

Christopher J. Russell9 and R. M. Shannon10,11 (PPTA Collaboration)

  • 1School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
  • 2School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
  • 3CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Department of Astronomy, Beijing Normal University, Beijing 100875, China
  • 5Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China
  • 6International Centre for Radio Astronomy Research, Curtin University, Bentley, Western Australia 6102, Australia
  • 7Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hangzhou 311100, China
  • 8Australia Telescope National Facility, CSIRO Astronomy and Space Science, P.O. Box 76, Epping, New South Wales 1710, Australia
  • 9CSIRO Scientific Computing, Australian Technology Park, Locked Bag 9013, Alexandria, New South Wales 1435, Australia
  • 10Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122 Australia
  • 11Australian Research Council Centre of Excellence in Gravitational Wave Discovery (OzGrav)

  • *wuyumei@itp.ac.cn
  • †Correspondingauthor. zucheng.chen@bnu.edu.cn
  • ‡Correspondingauthor. huangqg@itp.ac.cn
  • §Correspondingauthor. zhuxj@bnu.edu.cn
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Phys. Rev. D 106, L081101 – Published 31 October, 2022

DOI: https://doi.org/10.1103/PhysRevD.106.L081101

Abstract

Composed of ultralight bosons, fuzzy dark matter provides an intriguing solution to challenges that the standard cold dark matter model encounters on subgalactic scales. The ultralight dark matter with mass m∼10−23  eV will induce a periodic oscillation in gravitational potentials with a frequency in the nanohertz band, leading to observable effects in the arrival times of radio pulses from pulsars. Unlike scalar dark matter, pulsar timing signals induced by the vector dark matter are dependent on the oscillation direction of the vector fields. In this work, we search for ultralight vector dark matter in the mass range of [2×10−24,2×10−22]  eV through its gravitational effect in the Parkes Pulsar Timing Array (PPTA) second data release. Since no statistically significant detection is made, we place 95% upper limits on the local dark matter density as ρVF≲5  GeV/cm3 for m≲10−23  eV. As no preferred direction is found for the vector dark matter, these constraints are comparable to those given by the scalar dark matter search with an earlier 12-year dataset of PPTA.

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Phys. Rev. D 106, L081101– Published 31 October, 2022
  • Received 22 July 2022
  • Accepted 7 October 2022
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