A framework combining derivatives of angular diameter distance with line-of-sight expansion rate enables model-independent tests of FLRW consistency and yields a nonparametric estimator for the cosmic density field independent of Friedmann equations.
Heinesen, Differential age observations and their con- straining power in cosmology, Phys
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Diagnostic Consistency Tests of the Concordance Cosmology
A framework combining derivatives of angular diameter distance with line-of-sight expansion rate enables model-independent tests of FLRW consistency and yields a nonparametric estimator for the cosmic density field independent of Friedmann equations.
- Model-independent constraints on generalized FLRW consistency relations with bootstrap-based symbolic regression