Michael Bradley, Mats Forsberg, Zoltán Keresztes, László Á. Gergely, Peter K. S. Dunsby
Perturbations of Kantowski-Sachs models with a positive cosmological constant are considered in a harmonic decomposition, in the framework of gauge invariant 1+3 and 1+1+2 covariant splits of spacetime. Scalar, vector and tensor modes are allowed, however they remain vorticity-free and of perfect fluid type. The dynamics is encompassed in six evolution equations for six harmonic coefficients.
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http://arxiv.org/abs/1303.4576
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