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

Abstract

Composed of ultralight bosons, fuzzy dark matter provides an intriguing solution to challenges that the standard cold dark matter model encounters on sub-galactic scales. The ultralight dark matter with mass $m\sim 10^{-23}\mathrm{eV}$ 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 $[2\times 10^{-24},2\times 10^{-22}]\mathrm{eV}$ 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 ${\rho }_{\mathrm{VF}}\lesssim 5GeV/c{\mathrm{m}}^3$ for $m\lesssim 10^{-23}\mathrm{eV}$. 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 data set of PPTA.

arXiv comment9 pages, 3 figures, 2 tables; accepted for publication as a Letter in Phys. Rev. D

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