Pankaj Chavan

Padé semi-cosmographic reconstruction of residual dark energy in decaying dark matter cosmology: DESI DR2 BAO constraints and mock 21 cm forecasts

Abstract Pure cosmographic reconstructions provide a model-agnostic approach towards constraining cosmic evolution. We develop a hybrid phenomenological semi-cosmographic framework that adopts a Padé-rational fraction parametrization of the luminosity distance, and incorporates a...