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dc.contributor.authorLi, Chunlong
dc.contributor.authorYan, Sheng-Feng
dc.contributor.authorXue, Lingqin
dc.contributor.authorRen, Xin
dc.contributor.authorCai, Yi-Fu
dc.contributor.authorEasson, Damien A.
dc.contributor.authorYuan, Ye-Fei
dc.contributor.authorZhao, Hongsheng
dc.identifier.citationLi , C , Yan , S-F , Xue , L , Ren , X , Cai , Y-F , Easson , D A , Yuan , Y-F & Zhao , H 2020 , ' Testing the equivalence principle via the shadow of black holes ' , Physical Review Research , vol. 2 , no. 2 , 023164 .
dc.identifier.otherPURE: 265148893
dc.identifier.otherPURE UUID: 4579455a-c8db-482e-b8bd-41f9f5d1032d
dc.identifier.otherScopus: 85112383666
dc.identifier.otherWOS: 000603585200003
dc.descriptionFunding: H.Z. acknowledges support from the USTC fellowship for international visiting professors and from Shanghai Astronomical Observatory. This work is sup- ported in part by the NSFC (No. 11722327, No. 11653002, No. 11961131007, No. 11725312, No. 11421303), by the CAST (No. 2016QNRC001), by the National Youth Talents Program of China, and by the Fundamental Research Funds for Central Universities. The work of D.A.E. is supported in part by the Foundational Questions Institute.en
dc.description.abstractWe study the equivalence principle, regarded as the cornerstone of general relativity, by analyzing the deformation observable of black hole shadows. Such deformation can arise from new physics and may be expressed as a phenomenological violation of the equivalence principle. Specifically, we assume that there is an additional background vector field that couples to the photons around the supermassive black hole. This type of coupling yields impact on the way the system depends on initial conditions and affects the black hole shadow at different wavelengths by a different amount, and therefore observations of the shadow in different wavelengths could constrain such couplings. This can be tested by future multiband observations. Adopting a specific form of the vector field, we obtain constraints on model parameters from Event Horizon Telescope observations and measurements of gas/stellar orbits.
dc.relation.ispartofPhysical Review Researchen
dc.rightsCopyright © 2021 by the authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.en
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleTesting the equivalence principle via the shadow of black holesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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