Speaker
Description
The redshift drift provides a kinematic test of the cosmic expansion history through the slow time variation of the redshift of comoving sources. Motivated by the expected Sandage-Loeb measurements from future facilities, the drift is investigated within a cosmographic framework, modeling the Hubble rate through both a second-order Taylor expansion and a (2,1) Padé approximant. The constraints on the cosmographic parameters ($H_0$ , $q_0$, $j_0$) are derived by combining Pantheon+ and SH0ES type Ia supernovae with gamma-ray bursts and then examine the impact of adding baryonic acoustic oscillation measurements from the second DESI data release. The resulting constraints are used to construct a mock Sandage-Loeb catalog, after which the analyses are repeated including the simulated drift data. In this way, it is possible to assess the internal consistency of the reconstructed background rather than perform an independent forecast. Then, the reconstructed redshift drift is compared with the corresponding behavior predicted by the $\Lambda$CDM and $\omega_0\omega_1$CDM scenarios.