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Showing 1 to 2 of 2 for “"Bardeen variables."”.
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Fluid and gas models in FLRW and almost FLRW universes
… to a large degree in the Gauge Invariant (GI) Bardeen approach to perturbation theory by studies of gases based on the relativistic Boltzmann equation. These treatments, however, were not fully covariant. The GI Bardeen approach is dependent on a co-ordinate choice, while in the full GIC …
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Perturbations and symmetry in gravitational theories : wormholes, wave dynamics, and quantum effects in rotating spacetimes.
… Using plane gravitational waves, the Bardeen formalism is constructed and contrasted with curvature-based approaches like Newman–Penrose scalars and the Cartan–Karlhede algorithm. While curvature invariants fail to distinguish tensor polarization states, projections onto background …