299 citations · 428 across the 18 of their papers we have counts for
6 papers · 1 filter
Metastable Dark Energy on the Phantom Brane
Purba Mukherjee, Arman Shafieloo, Varun Sahni +1
Recent DESI observations hint at a preference for dynamical dark energy with an equation of state (EoS) that crosses the phantom divide at . In this work, we investigate \tex…
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
In this work, we investigate whether the mismatch between early- and late-Universe inferences of the cosmic expansion history is associated with a particular redshift range, and wh…
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…