299 citations · 428 across the 18 of their papers we have counts for
18 papers · 1 filter
Revisiting Metastable Dark Energy in Light of DESI DR2 BAO and DESI DR1 Full-Shape Measurements
Purba Mukherjee, Arman Shafieloo, Varun Sahni
We revisit metastable dark energy (DE) models described by a radioactive-like decay law. We consider three scenarios: an effective, exponentially decaying DE component; decay of DE…
Model-Independent Indication for a Localized Anomaly in the Late-Time Expansion History
Shibendu Gupta Choudhury, Purba Mukherjee, Eleonora Di Valentino +1
We investigate the late-time expansion history of the Universe using a model-independent spline reconstruction of cosmological distances based on the latest DESI DR2 baryon acousti…
Early- and Late-Time Modifications to CDM: Implications for the Hubble Tension
Rahul Dhyani, Purba Mukherjee, Arindam Chatterjee +1
We investigate an extension of CDM in which a fraction of cold Dark Matter (DM) decays into invisible dark radiation (DR) around the radiation-matter equality epoch, together wi…
Investigating the Tension and Expansion-History Mismatch with Diverse Dark Energy Parametrization Frameworks
Upala Mukhopadhyay, Purba Mukherjee, Alexandre Tkatchenko
The CDM model successfully explains a wide range of cosmological observations; however, persistent discrepancies most notably the tension between early and late time measu…
Probing Interacting Dark Sectors with upcoming Post-Reionization and Galaxy Surveys
Rahul Shah, Antara Dey, Purba Mukherjee +1
We investigate the constraining power of future post-reionization and galaxy surveys on possible interactions between dynamical dark energy and dark matter. The analysis focuses on…
Exploring the Impact of Systematic Bias in Type Ia Supernova Cosmology Across Diverse Dark Energy Parametrizations
Drishti Sharma, Purba Mukherjee, Anjan A Sen +1
We investigate the impact of instrumental and astrophysical systematics on dark energy (DE) constraints from Type Ia supernova (SN-Ia) observations. Using simulated datasets consis…