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dc.contributor.authorBrax, P
dc.contributor.authorDavis, Anne
dc.contributor.authorMelville, Scott
dc.contributor.authorWong, LK
dc.date.accessioned2021-10-26T14:50:21Z
dc.date.available2021-10-26T14:50:21Z
dc.date.issued2021-10
dc.date.submitted2021-07-30
dc.identifier.issn1475-7516
dc.identifier.otherjcap_108p_0721
dc.identifier.otherjcap_108p_0721
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/329903
dc.description.abstractGravitational waves provide us with a new window into our Universe, and have already been used to place strong constrains on the existence of light scalar fields, which are a common feature in many alternative theories of gravity. However, spin effects are still relatively unexplored in this context. In this work, we construct an effective point-particle action for a generic spinning body that can couple both conformally and disformally to a real scalar field, and we show that requiring the existence of a self-consistent solution automatically implies that if a scalar couples to the mass of a body, then it must also couple to its spin. We then use well-established effective field theory techniques to conduct a comprehensive study of spin-orbit effects in binary systems to leading order in the post-Newtonian (PN) expansion. Focusing on quasicircular nonprecessing binaries for simplicity, we systematically compute all key quantities, including the conservative potential, the orbital binding energy, the radiated power, and the gravitational-wave phase. We show that depending on how strongly each member of the binary couples to the scalar, the spin-orbit effects that are due to a conformal coupling first enter into the phase at either 0.5PN or 1.5PN order, while those that arise from a disformal coupling start at either 3.5PN or 4.5PN order. This suppression by additional PN orders notwithstanding, we find that the disformal spin-orbit terms can actually dominate over their conformal counterparts due to an enhancement by a large prefactor. Accordingly, our results suggest that upcoming gravitational-wave detectors could be sensitive to disformal spin-orbit effects in double neutron star binaries if at least one of the two bodies is sufficiently scalarised.
dc.languageen
dc.publisherIOP Publishing
dc.subjectpaper
dc.subjectGravitational waves in GR and beyond : theory
dc.subjectdark energy theory
dc.subjectmodified gravity
dc.titleSpin-orbit effects for compact binaries in scalar-tensor gravity
dc.typeArticle
dc.date.updated2021-10-26T14:50:18Z
prism.issueIdentifier10
prism.publicationNameJournal of Cosmology and Astroparticle Physics
prism.volume2021
dc.identifier.doi10.17863/CAM.77348
dcterms.dateAccepted2021-09-30
rioxxterms.versionofrecord10.1088/1475-7516/2021/10/075
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidMelville, Scott [0000-0003-3516-856X]
dc.identifier.eissn1475-7516
dc.publisher.urlhttp://dx.doi.org/10.1088/1475-7516/2021/10/075
cam.issuedOnline2021-10-26


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