From the 1 of 5 linked papers with an AI index.
5 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…
Beyond CDM with a Logistic RG-like Flow of the Low Redshift Cosmic Evolution
Shibendu Gupta Choudhury, Anjan A Sen
Recent observations hint at possible late-time deviations from CDM. We introduce a minimal phenomenological framework in which the total equation of state follows…
Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity
Shibendu Gupta Choudhury, Koushik Dutta, Deep Ghosh
One of the key features of the -gravity is the embedding of a scalar field, scalaron, into the gravity sector. The scalaron interacts with the Standard Model (SM) matter field…
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…
Towards a Composite Framework for Simultaneous Exploration of New Physics in Background and Perturbed Universe
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We investigate deviations from CDM by independently parameterizing modifications in the background evolution and the growth of structures. The background is characterized by tw…