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Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory

dc.creatorPapallo, Giuseppe
dc.creatorReall, Harvey Stephen
dc.date.accessioned2018-11-24T23:18:26Z
dc.date.available2015-10-21T14:52:20Z
dc.date.available2018-11-24T23:18:26Z
dc.date.issued2015-11-17
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/252357
dc.identifier.urihttp://repository.aust.edu.ng/xmlui/handle/123456789/3276
dc.description.abstractCamanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can experience a negative Shapiro time delay, i.e. a time advance, in Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular “shock-wave” geometries. We study this effect for gravitons propagating in smooth black hole spacetimes. For a small enough black hole, we find that gravitons of appropriate polarisation, and small impact parameter, can experience time advance. Such gravitons can also exhibit a deflection angle less than π, characteristic of a repulsive short-distance gravitational interaction. We discuss problems with the suggestion that the time advance can be used to build a “time machine”. In particular, we argue that a small black hole cannot be boosted to a speed arbitrarily close to the speed of light, as would be required in such a construction.
dc.languageen
dc.publisherSpringer
dc.publisherJournal of High Energy Physics
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International License
dc.titleGraviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
dc.typeArticle


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