12 papers
Does Early Dark Energy Absorb the DESI Late-Time Dynamics Signal? A Combined Analysis
Mohammad Malekjani, Saeed Pourojaghi
While the recent Baryon Acoustic Oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) collaboration are largely consistent with a flat CDM cosmolo…
Redshift Dependence of Dipole in Pantheon+ Supernovae
M. H. Jalali-Kanafi, E. Ó Colgáin, S. Pourojaghi +1
We examine the dipole structure in the local cosmic expansion rate using the Pantheon+ compilation of Type Ia supernovae. We reconstruct directional maps of across the…
Crosschecking Cosmic Distances from DESI BAO and DES SNe
Mauricio Lopez-Hernandez, Eoin à Colgáin, Saeed Pourojaghi +1
We perform a consistency check of DESI DR2 BAO constraints ( by reconstructing the same quantities from DES supernovae (SNe) in bins with the same effective reds…
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…
How Complex is Dark Energy? A Bayesian Analysis of CPL Extensions with Recent DESI BAO Measurements
Mohammad Malekjani, Saeed Pourojaghi, Zahra Davari
The nature of dark energy is one of the big puzzling issues in cosmology. While CDM provides a good fit to the observational data, evolving dark energy scenarios, such as the C…
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…