Conference Proceedings

No tension between pulsar timing array upper limits on the nano-Hertz gravitational wave background and assembly models of massive black hole binaries

Hannah Middleton, Siyuan Chen, Walter Del Pozzo, Alberto Sesana, Alberto Vecchio

Journal of Physics : Conference Series | Institute of Physics (IoP) | Published : 2020

Abstract

Pulsar timing arrays provide a means to observe the nano-Hertz gravitational wave background from the population of merging massive black hole binaries. Observations are placing increasingly stringent upper limits on the gravitational wave background. Upper limits and future detections will enable the study of the properties of the merging population. Recent upper limits have cast doubt on current predictions of the gravitational wave background. Here we perform a Bayesian analysis comparing upper limits to astrophysical prediction. So far models are consistent with observation. These proceedings summarise previous work in Ref. [1].

University of Melbourne Researchers

Grants

Awarded by Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav)


Funding Acknowledgements

HM and AV acknowledge support from the Science and Technology Facilities Council (STFC). SC acknowledges the support of the University of Birmingham via the AE Hills scholarship. AS acknowledges support by a URF of the Royal Society. HM also acknowledges support from Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav) (project number CE170100004).