Abstract
Intrinsic time-dependent invariants are constructed for classical, flat, homogeneous, anisotropic cosmology with a massless scalar material source. Invariance under the time reparameterization-induced canonical symmetry group is displayed explicitly.
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Salisbury, D.C., Helpert, J. & Schmitz, A. Reparameterization invariants for anisotropic Bianchi I cosmology with a massless scalar source. Gen Relativ Gravit 40, 1475–1498 (2008). https://doi.org/10.1007/s10714-007-0541-0
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DOI: https://doi.org/10.1007/s10714-007-0541-0