Linearized Treatment of Scalar perturbations in the Asymptotic Cosmological Model

TL;DR

This paper explores scalar perturbations within the Asymptotic Cosmological Model, fitting observational data and deriving linearized equations to compare with other models of cosmic acceleration.

Contribution

It introduces a linearized treatment of scalar perturbations in the ACM and fits the model to key cosmological datasets, providing a new approach to understanding cosmic acceleration.

Findings

ACM fits well with SNe, CMB, and BAO data

Derived linearized scalar perturbation equations for ACM

Compared perturbation results with other acceleration models

Abstract

In this paper the implications of a recently proposed phenomenological model of cosmology, the Asymptotic Cosmological Model (ACM), on the behavior of scalar perturbations are studied. Firstly we discuss new fits of the ACM at the homogeneous level, including fits to the Type Ia Supernovae UNION dataset, first CMB peak of WMAP5 and BAOs. The linearized equations of scalar perturbations in the FRW metric are derived. A simple model is used to compute the CMB temperature perturbation spectrum. The results are compared with the treatment of perturbations in other approaches to the problem of the accelerated expansion of the universe.