{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T01:07:32Z","timestamp":1771981652905,"version":"3.50.1"},"reference-count":12,"publisher":"World Scientific Pub Co Pte Lt","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mod. Phys. D"],"published-print":{"date-parts":[[2015,10]]},"abstract":"<jats:p> Kerr black holes (BHs) have their angular momentum, [Formula: see text], bounded by their mass, [Formula: see text]: [Formula: see text]. There are, however, known BH solutions violating this Kerr bound. We propose a very simple universal bound on the rotation, rather than on the angular momentum, of four-dimensional, stationary and axisymmetric, asymptotically flat BHs, given in terms of an appropriately defined horizon linear velocity, [Formula: see text]. The [Formula: see text] bound is simply that [Formula: see text] cannot exceed the velocity of light. We verify the [Formula: see text] bound for known BH solutions, including some that violate the Kerr bound, and conjecture that only extremal Kerr BHs saturate the [Formula: see text] bound. <\/jats:p>","DOI":"10.1142\/s0218271815440228","type":"journal-article","created":{"date-parts":[[2015,11,9]],"date-time":"2015-11-09T09:15:04Z","timestamp":1447060504000},"page":"1544022","source":"Crossref","is-referenced-by-count":42,"title":["How fast can a black hole rotate?"],"prefix":"10.1142","volume":"24","author":[{"given":"Carlos A. R.","family":"Herdeiro","sequence":"first","affiliation":[{"name":"Departamento de F\u00edsica da Universidade de Aveiro and CIDMA, Campus de Santiago, 3810-183 Aveiro, Portugal"}]},{"given":"Eugen","family":"Radu","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica da Universidade de Aveiro and CIDMA, Campus de Santiago, 3810-183 Aveiro, Portugal"}]}],"member":"219","published-online":{"date-parts":[[2015,11,25]]},"reference":[{"key":"S0218271815440228BIB1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.11.237"},{"key":"S0218271815440228BIB3","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.96.101101"},{"key":"S0218271815440228BIB4","doi-asserted-by":"crossref","first-page":"33","DOI":"10.4310\/jdg\/1207834657","volume":"79","author":"Dain S.","year":"2008","journal-title":"J. Differ. Geom."},{"key":"S0218271815440228BIB5","doi-asserted-by":"publisher","DOI":"10.1016\/j.aop.2007.12.011"},{"key":"S0218271815440228BIB6","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.112.221101"},{"key":"S0218271815440228BIB7","doi-asserted-by":"publisher","DOI":"10.1088\/0264-9381\/20\/20\/201"},{"key":"S0218271815440228BIB8","doi-asserted-by":"publisher","DOI":"10.12942\/lrr-2012-6"},{"key":"S0218271815440228BIB9","doi-asserted-by":"publisher","DOI":"10.1016\/j.physletb.2015.04.014"},{"key":"S0218271815440228BIB10","doi-asserted-by":"publisher","DOI":"10.1088\/0264-9381\/32\/14\/144001"},{"key":"S0218271815440228BIB11","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.84.121503"},{"key":"S0218271815440228BIB12","doi-asserted-by":"publisher","DOI":"10.1088\/1126-6708\/2007\/05\/050"},{"key":"S0218271815440228BIB14","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.80.084037"}],"container-title":["International Journal of Modern Physics D"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.worldscientific.com\/doi\/pdf\/10.1142\/S0218271815440228","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,8,6]],"date-time":"2019-08-06T19:49:28Z","timestamp":1565120968000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.worldscientific.com\/doi\/abs\/10.1142\/S0218271815440228"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,10]]},"references-count":12,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2015,11,25]]},"published-print":{"date-parts":[[2015,10]]}},"alternative-id":["10.1142\/S0218271815440228"],"URL":"https:\/\/doi.org\/10.1142\/s0218271815440228","relation":{},"ISSN":["0218-2718","1793-6594"],"issn-type":[{"value":"0218-2718","type":"print"},{"value":"1793-6594","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,10]]}}}