Kotub Uddin

Density perturbations in f(R) gravity theories in metric and Palatini formalisms

We make a detailed study of matter density perturbations in both metric and Palatini formalisms. Considering general theories whose Lagrangian density is a general function,

Cosmological scaling solutions in generalised Gauss--Bonnet gravity theories

f(R)

Cosmological perturbations in Palatini-modified gravity

, of the Ricci scalar

A study of the influence of measurement timescale on internal resistance characterisation methodologies for lithium-ion cells

R

Transportation Safety of Lithium Iron Phosphate Batteries - A Feasibility Study of Storing at Very Low States of Charge

, we derive the equation of matter density perturbations in each case, in a number of gauges, including comoving, longitudinal and uniform density gauges. We show that for viable

Constraints on scalar-tensor models of dark energy from observational and local gravity tests

f(R)

An Acausal Li-Ion Battery Pack Model for Automotive Applications

models that satisfy cosmological and local gravity constraints (LGC), matter perturbation equations derived under a subhorizon approximation are valid even for super-Hubble scales provided the oscillating mode (scalaron) does not dominate over the matter-induced mode. Such approximate equations are especially reliable in the Palatini formalism because of the absence of scalarons. Using these equations we make a comparative study of the behavior of matter density perturbations as well as gravitational potentials for a number of classes of

The effects of high frequency current ripple on electric vehicle battery performance

f(R)

Characterising Lithium-Ion Battery Degradation through the Identification and Tracking of Electrochemical Battery Model Parameters

theories. In the metric formalism the quantity

On the possibility of extending the lifetime of lithium-ion batteries through optimal V2G facilitated by an integrated vehicle and smart-grid system

m=R{f}_{,RR}/{f}_{,R}