Pulsar Timing Residual induced by Wideband Ultralight Dark Matter with
  Spin 0, 1, 2
  The coherent oscillation of ultralight dark matter induces changes in
gravitational potential with the frequency in nanohertz range. This effect is
known to produce a monochromatic signal in the pulsar timing residual. Here we
discuss a multi fields scenario that produces a wide spectrum of frequencies,
such that the ultralight particle oscillation can mimic the pulsar timing
signal of stochastic gravitational wave background. We discuss how ultralight
dark matter with various spins produces such a wideband spectrum on pulsar
timing residuals and perform the Bayesian analysis to constrain the parameters.
