2 citations · 2 across the 12 of their papers we have counts for
12 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 i…
Cosmological structure growth in energy-momentum squared gravity
Alvaro de la Cruz-Dombriz, Peter K. S. Dunsby, Payel Sarkar
We investigate the cosmological evolution of matter perturbations in the modified gravity model , where denotes the quadratic contraction of the energy…
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…
Covariant Tolman-Oppenheimer-Volkoff equations in Energy-Momentum Squared Gravity
Eduardo Bittencourt, Mariam Campbell, Peter K. S. Dunsby +1
We study static, spherically symmetric stellar configurations in an extended class of Energy--Momentum Squared Gravity using the covariant \(1+1+2\) semi-tetrad formalism. For perf…
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…
Closing the Cosmographic Hierarchy: Dynamical Attractors from Inflation to Reheating
Seturumane Tema, S. Shajidul Haque, Saurya Das +1
We develop a potential-independent cosmographic framework, in which cosmographic parameters are promoted to dynamical variables within a closed autonomous system. Although the cosm…
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 fu…
Past and future isotropization in dark energy models
Adnaan Nauthoo, Peter Dunsby, Álvaro de la Cruz-Dombriz
We present a dynamical system analysis for the homogeneous and anisotropic Bianchi I cosmology in the context of Hu-Sawicki gravity with parameters . De…
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 in…
Power-Law Bounces in Gravity: Analysis of the Ekpyrosis and Accelerating Regimes
Saurya Das, Peter Dunsby, S. Shajidul Haque +1
We investigate the dynamics of the Friedmann-Lemaître-Robertson-Walker spacetime within the framework of gravity using a compact, model-independent dynamical systems approac…
Close Hyperbolic Encounters In f(R) Gravity
Jenna Bruton, Peter Dunsby, Alvaro de la Cruz-Dombriz
We explore the dynamics and gravitational-wave emission from black hole pairs on unbound orbits undergoing close hyperbolic encounters (CHEs) in dense astrophysical environments. W…
A model independent approach to the study of structure growth in gravity
Kelly MacDevette, Jess Worsley, Peter Dunsby +1
Over the last decade, much attention has been given to the study of modified gravity theories to find a more natural explanation for the late-time acceleration of the Universe. Par…