Orateur
Prof.
Anjan Ananda Sen
(Jamia Millis Islamia)
Description
Recent observations hint at possible late-time deviations from ΛCDM. We introduce a minimal phenomenological framework in which the total equation of state wT(z) follows a logistic evolution motivated by renormalization-group–like flow between cosmological fixed points. Using DESI-DR2 BAO, DES supernova data, and CMB distance priors, we find that this parametrization provides an improved description of the expansion history relative to ΛCDM. The reconstructed evolution, though model specific, also shows statistically strong low-redshift deviations from ΛCDM.
Auteurs
Prof.
Anjan Ananda Sen
(Jamia Millis Islamia)
Dr
Shibendu Gupta Choudhury
(Jamia Millia Islamia)