227 citations · 340 across the 11 of their papers we have counts for
5 papers · 1 filter
Disformal interactions in the Dark Sector: From driving Early Dark Energy to confronting cosmological tensions
Pulkit Bansal, Joseph P. Johnson, S. Shankaranarayanan
The CDM model faces significant challenges, including an incomplete understanding of the dark sector and persistent tensions in the Hubble constant and the clustering amplitude.…
Kernel dependence of the Gaussian Process reconstruction of late Universe expansion history
Joseph P Johnson, H. K. Jassal
In this work, we discuss model-independent reconstruction of the expansion history of the late Universe. We use Gaussian Process Regression (GPR) to reconstruct the evolution of va…
Interacting dark sector from Horndeski theories and beyond: Mapping fields and fluids
Pulkit Bansal, Joseph P Johnson, S. Shankaranarayanan
In Cosmology, when dissipative effects are minimal, the energy content of the Universe can be effectively described as a sum of perfect fluids. Perfect fluid descriptions ensure th…
Observational constraints and predictions of the interacting dark sector with field-fluid mapping
Joseph P Johnson, Archana Sangwan, S. Shankaranarayanan
We consider an interacting field theory model that describes the dark energy - dark matter interaction. Only for a specific interaction term, this interacting field theory descript…
Low-energy modified gravity signatures on the large-scale structures
Joseph P Johnson, S. Shankaranarayanan
A large number of dark energy and modified gravity models lead to the same expansion history of the Universe, hence, making it difficult to distinguish them from observations. To m…