From the 1 of 10 linked papers with an AI index.
10 papers
Model-Independent Indication for a Localized Anomaly in the Late-Time Expansion History
Shibendu Gupta Choudhury, Purba Mukherjee, Eleonora Di Valentino +1
Using a model‑independent spline reconstruction of distances from DESI BAO data and DES supernovae, the authors find a localized ~3.5σ deviation from the Planck ΛCDM expansion hist…
Quintessential Implications of the presence of AdS in the Dark Energy sector
Purba Mukherjee, Dharmendra Kumar, Anjan A Sen
We explore the implications for an Anti-de Sitter (AdS) vacuum, equivalently a negative cosmological constant (nCC), in the dark energy (DE) sector using current cosmological obser…
Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?
Anirban Chakraborty, Tirthankar Roy Choudhury, Anjan Ananda Sen +1
The unexpectedly large abundance of UV-bright galaxies at discovered by the James Webb Space Telescope poses a significant challenge to the standard CDM cosmology. This…
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 constraints derived from Type~Ia supernova (SN-Ia) observations. Using simulated datasets con…
Anchoring the Universe with Characteristic Redshifts using Raychaudhuri Equation Informed Reconstruction Algorithm (REIRA)
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We study the robustness and physical implications of a set of characteristic redshifts that capture key features of the late-time Universe. Using both model-independent reconstruct…
New Expansion Rate Anomalies at Characteristic Redshifts Geometrically Determined using DESI-DR2 BAO and DES-SN5YR Observations
Purba Mukherjee, Anjan A Sen
We perform a model-independent reconstruction of the cosmic distances using the Multi-Task Gaussian Process (MTGP) framework as well as knot-based spline techniques with DESI-DR2 B…