Do we really need alternatives to the ${\omega }_0{\omega }_a$CDM parameterization after the DESI DR2?

Youri Carloni, Orlando Luongo, Marek Biesiada

We introduce a density-level pivot construction for the Chevallier-Polarski-Linder (CPL) parameterization by defining the normalized dark energy density $f_p\equiv f_{\mathrm{DE}}(a_p)$…