6 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…
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…
Cosmological constraints on dark energy parametrizations after DESI 2024: Persistent deviation from standard CDM cosmology
M. Malekjani, Z. Davari, S. Pourojaghi
In this work, we present a study on cosmological constraints of dark energy (DE) parametrizations after the observations of Dark Energy Spectroscopic Instruments (DESI) for Baryon…
CDM model against redshift-binned data: A mock analysis based on SNIa and Cosmic Chronometers
Saeed Pourojaghi, Mohammad Malekjani
Despite the broad successes of the flat CDM model and its fitness to the various cosmological observations, it confronts challenges stemming from anomalies in the measurements…
CDM model against cosmography: A possible deviation after DESI 2024
Saeed Pourojaghi, Mohammad Malekjani, Zahra Davari
In this study, we present an analysis of the standard flat-CDM model using a cosmographic approach, incorporating recent DESI BAO observations and Supernovae Type Ia catalogues…
CDM Model Against Gravity-Thermodynamics Conjecture: Observational Constraints After DESI 2024
N. Shahhoseini, M. Malekjani, A. Khodam-Mohammadi
In the context of the gravity-thermodynamics conjecture based on the Tsallis entropy-area relation, we investigate the standard CDM cosmology and examine some potential deviati…