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dc.contributor.authorSampson, Laura M.
dc.contributor.authorCornish, Neil J.
dc.contributor.authorMcWilliams, Sean T.
dc.identifier.citationSampson, Laura, Neil J. Cornish, and Sean T. McWilliams. "Constraining the solution to the last parsec problem with pulsar timing." Physical Review D 91 (April 2015): 084055. DOI:
dc.description.abstractThe detection of a stochastic gravitational-wave signal from the superposition of many inspiraling supermassive black holes with pulsar timing arrays (PTAs) is likely to occur within the next decade. With this detection will come the opportunity to learn about the processes that drive black-hole-binary systems toward merger through their effects on the gravitational-wave spectrum. We use Bayesian methods to investigate the extent to which effects other than gravitational-wave emission can be distinguished using PTA observations. We show that, even in the absence of a detection, it is possible to place interesting constraints on these dynamical effects for conservative predictions of the population of tightly bound supermassive-black-hole binaries. For instance, if we assume a relatively weak signal consistent with a low number of bound binaries and a low black-hole-mass to galaxy-mass correlation, we still find that a nondetection by a simulated array, with a sensitivity that should be reached in practice within a few years, disfavors gravitational-wave-dominated evolution with an odds ratio of ∼30∶1. Such a finding would suggest either that all existing astrophysical models for the population of tightly bound binaries are overly optimistic, or else that some dynamical effect other than gravitational-wave emission is actually dominating binary evolution even at the relatively high frequencies/small orbital separations probed by PTAs.en_US
dc.description.sponsorshipWe have benefited from informative discussions with Justin Ellis and Xavier Siemens, and useful feedback from members of the NANOGrav Collaboration. In particular, Chiara Mingarelli provided helpful insight into our theoretical calculations. L. S. was supported by Nicolás Yunes’ NSF CAREER Grant No. PHY-1250636. N. J. C. and S. T. M. were supported by NSF Grant No. PHY-1430284 (NANOGrav Physics Frontiers Center).en_US
dc.titleConstraining the solution to the last parsec problem with pulsar timingen_US
mus.citation.journaltitlePhysical Review Den_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.universityMontana State University - Bozemanen_US

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