Pulsar Timing Residual induced by Wideband Ultralight Dark Matter with Spin 0, 1, 2

Understand

The coherent oscillation of ultralight dark matter in the mass regime around $10^{-23}$ eV induces changes in gravitational potential with the frequency in the nanohertz range.

• This effect is known to produce a monochromatic signal in the pulsar timing residuals.
• Here we discuss a multifield scenario that produces a wide spectrum of frequencies, such that the ultralight particle oscillation can mimic the pulsar timing signal of stochastic common spectrum process.
• We discuss how ultralight dark matter with various spins produces such a wide band spectrum on pulsar timing residuals and perform the Bayesian analysis to constrain the parameters.