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Pulsar timing and the detection of black hole binary systems in globular clusters
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The possible existence of intermediate mass binary black holes (IMBBHs) in globular clusters (GCs) offers a unique geometry in which to detect space-time oscillations. For certain pulsar-IMBBH configurations possible within a GC, the usual far-field plane wave approximation for the IMBBH metric perturbation severely underestimates the magnitude of the induced pulsar pulse time-of-arrival (TOA) fluctuations. In this letter, the expected TOA fluctuations induced by an IMBBH lying close to the line-of-sight between a pulsar and the Earth are calculated for the first time. For an IMBBH consisting of 10 Msolar and 10^3 Msolar components, a 10 year orbital period, and located 0.1 lyr from the Earth-Pulsar line of sight, the induced pulsar timing residual amplitude will be of order 5 to 500 ns.
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Detecting Intermediate-mass Black Holes Using Miniature Pulsar Timing Arrays in Globular Clusters
A mini pulsar timing array inside a globular cluster could detect intermediate-mass black hole binaries with mass ratios above about 0.1 via microsecond gravitational-wave timing residuals.
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