2 papers
astro-ph.CO2026
Probing late-time deviations from CDM with a quadratic dark energy expansion
Sehjal Khandelwal, Abraão J. S. Capistrano, Suresh Kumar +1
We investigate the observational viability of a quadratic dark energy expansion (QDEE) model as a phenomenological extension of the standard cosmological framework…
astro-ph.CO2026
Statistical consistency of sign-switching vacuum energy with cosmological observations
Sehjal Khandelwal, Abraão J. S. Capistrano, Suresh Kumar
We assess dataset agreement and late-time predictive adequacy in CDM and its sign-switching extension, CDM, using a suite of Gaussian and exact non-Gaussian consist…