Note on fundamental physics tests from black hole imaging: Comment on "Hunting for extra dimensions in the shadow of Sagittarius A$^*$"
cam.issuedOnline | 2022-05-27 | |
dc.contributor.author | Vagnozzi, Sunny | |
dc.contributor.author | Visinelli, Luca | |
dc.contributor.orcid | Vagnozzi, Sunny [0000-0002-7614-6677] | |
dc.date.accessioned | 2022-05-30T11:04:24Z | |
dc.date.available | 2022-05-30T11:04:24Z | |
dc.date.issued | 2022-05-27 | |
dc.date.submitted | 2022-05-23 | |
dc.date.updated | 2022-05-30T11:04:23Z | |
dc.description.abstract | Several works over the past years have discussed the possibility of testing fundamental physics using Very Long Baseline Interferometry horizon-scale black hole (BH) images, such as the Event Horizon Telescope (EHT) images of M87$^*$ and Sagittarius A$^*$ (Sgr A$^*$), using the size $r_{\rm sh}$ and deviation from circularity $\Delta \mathcal{C}$ of the BH shadow. For the case of the EHT image of Sgr A$^*$, limits on $\Delta \mathcal{C}$ are not available due to the sparse interferometric coverage of the 2017 observations, alongside the short variability timescale of Sgr A$^*$ compared to M87$^*$. Concerning this point, we comment on the results of a recent preprint which purports to have derived new limits on extra dimensions using the deviation from circularity of Sgr A$^*$'s shadow. The latter is quoted to be $\lesssim 10\%$ as with M87$^*$, based on the "similarity" of the two shadows: however, this is an incorrect assumption, invalidating the subsequent results. In the immediate future, the simplest tests of fundamental physics from Sgr A$^*$'s image will therefore mostly have to rely on $r_{\rm sh}$, whereas additional observables such as the photon ring and azimuthal angle lapse should soon be available and allow for novel tests. | |
dc.identifier.doi | 10.17863/CAM.85004 | |
dc.identifier.eissn | 2515-5172 | |
dc.identifier.issn | 2515-5172 | |
dc.identifier.other | rnaasac7331 | |
dc.identifier.other | ac7331 | |
dc.identifier.other | aas39667 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/337594 | |
dc.language | en | |
dc.language.iso | eng | |
dc.publisher | American Astronomical Society | |
dc.publisher.url | http://dx.doi.org/10.3847/2515-5172/ac7331 | |
dc.subject | astro-ph.GA | |
dc.subject | astro-ph.GA | |
dc.subject | astro-ph.CO | |
dc.subject | gr-qc | |
dc.subject | hep-ph | |
dc.subject | hep-th | |
dc.title | Note on fundamental physics tests from black hole imaging: Comment on "Hunting for extra dimensions in the shadow of Sagittarius A$^*$" | |
dc.type | Article | |
dcterms.dateAccepted | 2022-05-25 | |
prism.issueIdentifier | 5 | |
prism.publicationName | Res. Notes AAS | |
prism.volume | 6 | |
rioxxterms.licenseref.uri | http://creativecommons.org/licenses/by/4.0/ | |
rioxxterms.version | VoR | |
rioxxterms.versionofrecord | 10.3847/2515-5172/ac7331 |
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