Constraining Alternative Theories of Gravity Using Pulsar Timing Arrays

dc.contributor.authorCornish, Neil J.
dc.contributor.authorO'Beirne, Logan
dc.contributor.authorTaylor, Stephen R.
dc.contributor.authorYunes, Nicolas
dc.date.accessioned2018-11-01T15:29:56Z
dc.date.available2018-11-01T15:29:56Z
dc.date.issued2018-05
dc.description.abstractThe opening of the gravitational wave window by ground-based laser interferometers has made possible many new tests of gravity, including the first constraints on polarization. It is hoped that, within the next decade, pulsar timing will extend the window by making the first detections in the nanohertz frequency regime. Pulsar timing offers several advantages over ground-based interferometers for constraining the polarization of gravitational waves due to the many projections of the polarization pattern provided by the different lines of sight to the pulsars, and the enhanced response to longitudinal polarizations. Here, we show that existing results from pulsar timing arrays can be used to place stringent limits on the energy density of longitudinal stochastic gravitational waves. However, unambiguously distinguishing these modes from noise will be very difficult due to the large variances in the pulsar-pulsar correlation patterns. Existing upper limits on the power spectrum of pulsar timing residuals imply that the amplitude of vector longitudinal (VL) and scalar longitudinal (SL) modes at frequencies of 1/year are constrained, AVL<4×10^-16 and ASL<4×10^-17, while the bounds on the energy density for a scale invariant cosmological background are ΩVLh^2<4×10^-11 and ΩSLh^2<3×10^13.en_US
dc.identifier.citationCornish, Neil J. , Logan O'Beirne, Stephen R. Taylor, and Nicolas Yunes. "Constraining Alternative Theories of Gravity Using Pulsar Timing Arrays." Physical Review Letters 120, no. 18 (May 2018). DOI:10.1103/PhysRevLett.120.181101.en_US
dc.identifier.issn1079-7114
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/14963
dc.language.isoenen_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.titleConstraining Alternative Theories of Gravity Using Pulsar Timing Arraysen_US
dc.typeArticleen_US
mus.citation.issue18en_US
mus.citation.journaltitlePhysical Review Lettersen_US
mus.citation.volume120en_US
mus.data.thumbpage3en_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.identifier.doi10.1103/PhysRevLett.120.181101en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US

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