Angular correlation and deformed Hellings-Downs curve from spin-2 ultralight dark matter

Abstract

The pulsar timings are sensitive to both the nanohertz gravitational-wave background and the oscillation of ultralight dark matter. The Hellings-Downs angular correlation curve provides a criterion to search for stochastic gravitational-wave backgrounds at nanohertz via pulsar timing arrays. We study the angular correlation of the timing residuals induced by the spin-2 ultralight dark matter, which is different from the usual Hellings-Downs correlation. At a typical frequency, we show that the spin-2 ultralight dark matter can give rise to the deformation of the Hellings-Downs correlation curve induced by the stochastic gravitational wave background.

8 pages, 4 figures. v2: matching version published in PRD

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Cited by in corpus (5)

• Probing Self-Interacting Dark Matter via Gravitational-Wave Background from Eccentric Supermassive Black Hole Mergers
• Probing Spin-2 Ultralight Dark Matter with Space-based Gravitational Wave Detectors in the mHz Regime
• Signature of polarized ultralight vector dark matter in pulsar timing arrays
• Dynamically induced spin-2 mass in a Weyl-invariant framework
• Ultralight scalar dark matter versus nonadiabatic perfect fluid dark matter in pulsar timing