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Constraining alternative polarization states of gravitational waves from individual black hole binaries using pulsar timing arrays

O’Beirne, Logan and Cornish, Neil J. and Vigeland, Sarah J. and Taylor, Stephen R. (2019) Constraining alternative polarization states of gravitational waves from individual black hole binaries using pulsar timing arrays. Physical Review D, 99 (12). Art. No. 124039. ISSN 2470-0010. doi:10.1103/physrevd.99.124039.

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Pulsar timing arrays are sensitive to gravitational wave perturbations produced by individual supermassive black hole binaries during their early inspiral phase. Modified gravity theories allow for the emission of gravitational dipole radiation, which is enhanced relative to the quadrupole contribution for low orbital velocities, making the early inspiral an ideal regime to test for the presence of modified gravity effects. Using a theory-agnostic description of modified gravity theories based on the parametrized post-Einsteinian framework, we explore the possibility of detecting deviations from general relativity using simulated pulsar timing array data, and provide forecasts for the constraints that can be achieved. We generalize the enterprise pulsar timing software to account for possible additional polarization states and modifications to the phase evolution, and study how accurately the parameters of simulated signals can be recovered. We find that while a pure dipole model can partially recover a pure quadrupole signal, there is little possibility for confusion when the full model with all polarization states is used. With no signal present, and using noise levels comparable to those seen in contemporary arrays, we produce forecasts for the upper limits that can be placed on the amplitudes of alternative polarization modes as a function of the sky location of the source.

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Taylor, Stephen R.0000-0003-0264-1453
Additional Information:© 2019 American Physical Society. Received 4 April 2019; published 24 June 2019. We appreciate the support of the NSF Physics Frontiers Center Award No. PFC-1430284. We are grateful for computational resources provided by Leonard E. Parker Center for Gravitation, Cosmology and Astrophysics at the University of Wisconsin-Milwaukee, which are supported by NSF Grant No. 1626190. We thank Nicolás Yunes for helpful discussions.
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Issue or Number:12
Record Number:CaltechAUTHORS:20190624-132503174
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96669
Deposited By: Tony Diaz
Deposited On:25 Jun 2019 17:55
Last Modified:16 Nov 2021 17:22

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