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Giant wormholes in ghost-free bigravity theory

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dc.contributor.author Sushkov S.
dc.contributor.author Volkov M.
dc.date.accessioned 2018-09-18T20:36:39Z
dc.date.available 2018-09-18T20:36:39Z
dc.date.issued 2015
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/141667
dc.description.abstract We study Lorentzian wormholes in the ghost-free bigravity theory described by two metrics, g and f. Wormholes can exist if only the null energy condition is violated, which happens naturally in the bigravity theory since the graviton energy-momentum tensors do not apriori fulfill any energy conditions. As a result, the field equations admit solutions describing wormholes whose throat size is typically of the order of the inverse graviton mass. Hence, they are as large as the universe, so that in principle we might all live in a giant wormhole. The wormholes can be of two different types that we call W1 and W2. The W1 wormholes interpolate between the AdS spaces and have Killing horizons shielding the throat. The Fierz-Pauli graviton mass for these solutions becomes imaginary in the AdS zone, hence the gravitons behave as tachyons, but since the Breitenlohner-Freedman bound is fulfilled, there should be no tachyon instability. For the W2 wormholes the g-geometry is globally regular and in the far field zone it becomes the AdS up to subleading terms, its throat can be traversed by timelike geodesics, while the f-geometry has a completely different structure and is not geodesically complete. There is no evidence of tachyons for these solutions, although a detailed stability analysis remains an open issue. It is possible that the solutions may admit a holographic interpretation.
dc.subject dark energy theory
dc.subject modified gravity
dc.subject Wormholes
dc.title Giant wormholes in ghost-free bigravity theory
dc.type Article
dc.relation.ispartofseries-issue 6
dc.relation.ispartofseries-volume 2015
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS-2015-2015-6-SID84937917513


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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