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Stochastic Ultralight Dark Matter Fluctuations in Pulsar Timing Arrays
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Stochastic Ultralight Dark Matter Fluctuations in Pulsar Timing Arrays
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Metric perturbations induced by ultralight dark matter (ULDM) fields have long been identified as a potential target for pulsar timing array (PTA) observations. Previous works have focused on the coherent oscillation of metric perturbations at the characteristic frequency set by the ULDM mass. In this work, we show that ULDM fields source low-frequency stochastic metric fluctuations and that these low-frequency fluctuations can produce distinctive detectable signals in PTA data. Using the NANOGrav 12.5-year data set and synthetic data sets mimicking present and future PTA capabilities, we show that the current and future PTA observations provide the strongest probe of ULDM density within the solar system for masses in the range of $10^{-18}\;{\rm eV}-10^{-16}\;{\rm eV}$.
Forward citations
Cited by 5 Pith papers
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Is the Conventional Picture of Coherence Time Complete? Dark Matter Recoherence
Ultralight dark matter exhibits recoherence due to the solar gravitational potential, yielding formally divergent coherence times at long timescales and enhanced search sensitivity.
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LISA forecasts for quadratically coupled ultralight dark matter show competitive or superior sensitivity to terrestrial and astrophysical probes in selected mass windows, free of screening.
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Current interplanetary range measurements could probe ultralight dark matter at masses around 10^{-15} eV if its solar system density were 10^5 times the local value.
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Constraints on Ultralight Scalar and Dark Photon Dark Matter from PPTA-DR3 and EPTA-DR2
Bayesian analysis of PPTA-DR3 and EPTA-DR2 finds no statistically significant ULDM signals and sets 95% CL upper limits on scalar and dark photon dark matter, improving prior bounds in most mass ranges.
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Echoes of Global Cosmic Strings
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