dc.date.accessioned | 2020-12-08T20:41:54Z | |
dc.date.available | 2021-09-14T22:45:41Z | |
dc.date.created | 2020-12-04T09:22:25Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Khodadi, Mohsen Allahyari, Alireza Vagnozzi, Sunny Mota, David . Black holes with scalar hair in light of the Event Horizon Telescope. Journal of Cosmology and Astroparticle Physics. 2020, 2020(09) | |
dc.identifier.uri | http://hdl.handle.net/10852/81485 | |
dc.description.abstract | Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of additional scalar fields. The first observation of a black hole (BH) shadow by the Event Horizon Telescope (EHT) has opened a new direct window onto tests of gravity in the strong-field regime, including probes of violations of the NHT. We consider two scenarios described by the Einstein-Maxwell equations of General Relativity and electromagnetism, to which we add a scalar field. In the first case we consider a minimally-coupled scalar field with a potential, whereas in the second case the field is conformally-coupled to curvature. In both scenarios we construct charged BH solutions, which are found to carry primary scalar hair. We then compute the shadows cast by these two BHs as a function of their electric charge and scalar hair parameter. Comparing these shadows to the shadow of M87* recently imaged by the EHT collaboration, we set constraints on the amount of scalar hair carried by these two BHs. The conformally-coupled case admits a regime for the hair parameter, compatible with EHT constraints, describing a so-called mutated Reissner-Nordström BH: this solution was recently found to effectively mimic a wormhole. Our work provides novel constraints on fundamental physics, and in particular on violations of the no-hair theorem and the existence of additional scalar fields, from the shadow of M87*. | |
dc.language | EN | |
dc.title | Black holes with scalar hair in light of the Event Horizon Telescope | |
dc.type | Journal article | |
dc.creator.author | Khodadi, Mohsen | |
dc.creator.author | Allahyari, Alireza | |
dc.creator.author | Vagnozzi, Sunny | |
dc.creator.author | Mota, David | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 1856103 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Cosmology and Astroparticle Physics&rft.volume=2020&rft.spage=&rft.date=2020 | |
dc.identifier.jtitle | Journal of Cosmology and Astroparticle Physics | |
dc.identifier.volume | 2020 | |
dc.identifier.issue | 09 | |
dc.identifier.pagecount | 34 | |
dc.identifier.doi | https://doi.org/10.1088/1475-7516/2020/09/026 | |
dc.identifier.urn | URN:NBN:no-84562 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 1475-7516 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/81485/2/2005.05992.pdf | |
dc.type.version | AcceptedVersion | |
cristin.articleid | 026 | |
dc.relation.project | NFR/287772 | |
dc.relation.project | NFR/301367 | |