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Multigravity from a discrete extra dimension
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DOI：10.1016/j.physletb.2004.03.053.png)
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Abstract
En 中文
Multigravity theories are constructed from the discretization of the extra dimension of five-dimensional gravity. Using an ADM decomposition, the discretization is performed while maintaining the four-dimensional diffeomorphism invariance on each site. We relate the Goldstone bosons used to realize nonlinearly general covariance in discretized gravity to the shift fields of the higher-dimensional metric. We investigate the scalar excitations of the resulting theory and show the absence of ghosts and massive modes; this is due to a local symmetry inherited from the reparametrization invariance along the fifth dimension. (C) 2004 Published by Elsevier B.V.
Keywords:
MASSLESS SPIN-2 FIELDS
KALUZA-KLEIN THEORIES
COSMOLOGICAL CONSTANT
GAUGE-INVARIANCE
GRAVITY
COLLECTION
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