5 papers
How much has DESI dark energy evolved since DR1?
Eoin à Colgáin, Saeed Pourojaghi, M. M. Sheikh-Jabbari +1
DESI has reported a dynamical dark energy (DE) signal based on the CDM model that is in conflict with Hubble tension. Recalling that the combination of DESI DR1 BAO and DR…
On frequentist confidence intervals in a non-Gaussian regime
Shubham Barua, Shantanu Desai, Mauricio Lopez-Hernandez +1
We study frequentist confidence intervals based on graphical profile likelihoods (Wilks' theorem, likelihood integration), and the Feldman-Cousins (FC) prescription, a generalisati…
On the Analysis Dependence of DESI Dynamical Dark Energy
Eoin à Colgáin, Saeed Pourojaghi, M. M. Sheikh-Jabbari
We continue scientific scrutiny of the DESI dynamical dark energy (DE) claim by explicitly demonstrating that the result depends on the analysis pipeline. Concretely, we define a l…
Do high redshift QSOs and GRBs corroborate JWST?
Eoin à Colgáin, M. M. Sheikh-Jabbari, Lu Yin
The James Webb Space Telescope (JWST) is reporting massive high redshift galaxies that appear challenging from the CDM perspective. Interpreted as a cosmological problem, this…
A comparison of Bayesian and frequentist confidence intervals in the presence of a late Universe degeneracy
Eoin à Colgáin, Saeed Pourojaghi, M. M. Sheikh-Jabbari +1
Hubble tension is a problem in one-dimensional (1D) posteriors, since local determinations are only sensitive to a single parameter. Projected 1D posteriors for CDM cosmo…