9 papers
Beyond : Observational Constraints on Almost-CDM Cosmologies
Jess Worsley, Saikat Chakraborty, Peter Dunsby
The cosmographic condition provides the kinematical signature of the spatially flat CDM model independently of any specific dark-energy or modified-gravity theory. We…
Reconstructing the slope of a nearly flat quintessence potential from cosmography
Saikat Chakraborty, Peter K. S. Dunsby, Robert J. Scherrer
We revisit thawing quintessence models with nearly flat scalar-field potentials using a cosmographic framework. Earlier work indicates that the cosmographic reconstruction of the s…
Constraining Scale-Dependent Growth in Gravity with Future 21 cm Surveys
Apurba Samanta, Bhuwan Joshi, Jess Worsley +2
Recent observations, particularly from DESI, have provided intriguing hints of dynamical behaviour in late-time dark energy. Modified gravity theories offer a compelling framework…
Direct cosmographic reconstruction of the quintessence potential
Saikat Chakraborty, Peter K. S. Dunsby, Robert J. Scherrer
We derive expressions for the first and second derivatives of the quintessence potential , in terms of and , as…
A Unified Dynamical Systems Framework for Cosmology in Gravity: Generic Features Beyond the Coincident Gauge
Jibitesh Dutta, Wompherdeiki Khyllep, Saikat Chakraborty +2
We present a unified dynamical systems framework for spatially flat FLRW cosmology in gravity, covering all three connection branches via a single set of Hubble-normalised v…
Dynamical dark energy in models with evolution close to CDM
Saikat Chakraborty, Charlotte Louw, Peter K. S. Dunsby +2
In this communication we address whether or not there is an equivalence between the kinematical and dynamical descriptions of the spatially flat CDM model. We address this by i…