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100 papers
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…
Dark Matter as an Inflationary Relic in Warm Inflation
Swagat S. Mishra, Umang Kumar, Suratna Das +1
Warm inflation is usually expected to completely deplete the inflaton condensate by dissipating its energy into radiation. We show that this expectation fails in a simple and obser…
-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…
Braneworld Dark Energy in light of DESI DR2
Swagat S. Mishra, William L. Matthewson, Varun Sahni +2
Recent observational results from the DESI collaboration reveal tensions with the standard CDM model and favour a scenario in which dark energy (DE) decays over time. The DESI D…
New models of Quintessential Inflation featuring plateau and hilltop potentials
Swagat S. Mishra, Varun Sahni
We introduce a new class of hilltop and plateau potentials which can successfully unify inflation and dark energy resulting in Quintessential Inflation (QI). Interestingly these ne…