Spin-orbit effects for compact binaries in scalar-tensor gravity
| cam.issuedOnline | 2021-10-26 | |
| dc.contributor.author | Brax, P | |
| dc.contributor.author | Davis, AC | |
| dc.contributor.author | Melville, S | |
| dc.contributor.author | Wong, LK | |
| dc.contributor.orcid | Melville, Scott [0000-0003-3516-856X] | |
| dc.date.accessioned | 2021-10-26T14:50:21Z | |
| dc.date.available | 2021-10-26T14:50:21Z | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-07-30 | |
| dc.date.updated | 2021-10-26T14:50:18Z | |
| dc.description.abstract | Gravitational 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.identifier.doi | 10.17863/CAM.77348 | |
| dc.identifier.eissn | 1475-7516 | |
| dc.identifier.issn | 1475-7516 | |
| dc.identifier.other | jcap_108p_0721 | |
| dc.identifier.other | jcap_108p_0721 | |
| dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/329903 | |
| dc.language | en | |
| dc.language.iso | eng | |
| dc.publisher | IOP Publishing | |
| dc.publisher.url | http://dx.doi.org/10.1088/1475-7516/2021/10/075 | |
| dc.subject | Gravitational waves in GR and beyond : theory | |
| dc.subject | dark energy theory | |
| dc.subject | modified | |
| dc.subject | gravity | |
| dc.title | Spin-orbit effects for compact binaries in scalar-tensor gravity | |
| dc.type | Article | |
| dcterms.dateAccepted | 2021-09-30 | |
| prism.issueIdentifier | 10 | |
| prism.publicationName | Journal of Cosmology and Astroparticle Physics | |
| prism.volume | 2021 | |
| pubs.funder-project-id | EPSRC (EP/T017481/1) | |
| rioxxterms.licenseref.uri | http://creativecommons.org/licenses/by/4.0/ | |
| rioxxterms.version | VoR | |
| rioxxterms.versionofrecord | 10.1088/1475-7516/2021/10/075 |
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