8 papers
-probe: A new diagnostic of dark energy based on
Satadru Bag, Ryan E. Keeley, Varun Sahni +1
Recent DESI data suggest that dark energy may be evolving and motivate the use of model-independent diagnostics such as and probes of the equation of state (EoS) of dark en…
Reconstruction of the Quintessence Scalar Field Potential Using Gaussian Processes
Redouane El Ouardi, Amine Bouali, Ahmed Errahmani +3
Recent cosmological observations, including the latest Dark Energy Spectroscopic Instrument (DESI) data releases DR1 and DR2, have renewed interest in the possibility that dark ene…
The Preference for Evolving Dark Energy from Cosmological Distance Measurements and Possible Signatures in the Growth Rate of Perturbations
Ryan E. Keeley, Kevork N. Abazajian, Manoj Kaplinghat +1
In this study, we use a flexible parametrization of the equation of state of dark energy to explore its possible evolution with datasets from the Dark Energy Spectroscopic Instrume…
Could We Be Fooled about Phantom Crossing?
Ryan E. Keeley, Arman Shafieloo, William L. Matthewson
Recent data from DESI Year 2 BAO, Planck CMB, and various supernova compilations suggest a preference for evolving dark energy, with hints that the equation of state may cross the…
An Analysis of Variance of the Pantheon+ Dataset: Systematics in the Covariance Matrix?
Ryan Keeley, Arman Shafieloo, Benjamin L'Huillier
We investigate the statistics of the available Pantheon+ dataset. Noticing that the value for the best-fit CDM model to the real data is small, we quantify how significa…
Litmus tests of the flat CDM model and model-independent measurement of with LSST and DESI
Benjamin L'Huillier, Ayan Mitra, Arman Shafieloo +2
In this analysis we apply a model-independent framework to test the flat CDM cosmology using simulated SNIa data from the upcoming Legacy Survey of Space and Time (LSST) and co…