CORE
🇺🇦Â
 make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
A New Cosmological Model: Exploring the Evolution of the Universe and Unveiling Super-Accelerated Expansion
Authors
Dhruv Arora
Himanshu Chaudhary
+3Â more
Ujjal Debnath
S. K. Maurya
G. Mustafa
Publication date
14 August 2023
Publisher
View
on
arXiv
Abstract
In this paper, we present a cosmological model designed to study the evolution of the universe based on a new parametrization of the deceleration parameter. The model considers a spatially flat, homogeneous, and isotropic Friedmann-Lema\^itre-Robertson-Walker (FLRW) universe filled with radiation, dark matter (DM), and dark energy (DE). We derive the Friedmann equations and the energy conservation equation for the universe, accounting for separate conservation equations for radiation, DM, and DE. Our proposed deceleration parameter is given by a formula involving constants
H
0
H_{0}
H
0
​
,
Ω
r
0
\Omega_{r0}
Ω
r
0
​
,
Ω
m
0
\Omega_{m0}
Ω
m
0
​
,
q
2
q_{2}
q
2
​
,
q
1
q_{1}
q
1
​
,
q
0
q_{0}
q
0
​
,
α
\alpha
α
and
β
\beta
β
. which we subsequently fit to observational data. To assess the model's viability, we compare it with a diverse range of observational data, including cosmic chronometers, type Ia supernovae, baryon acoustic oscillations, and cosmic microwave background measurements. Employing the chi-square statistic and a Markov Chain Monte Carlo (MCMC) method, we estimate the best-fit values for the free parameters and investigate the constraints imposed by observational data on the model. Our results indicate that our cosmological model provides an excellent fit to the observed data and exhibits a remarkable agreement with the standard
Λ
\Lambda
Λ
CDM paradigm at higher redshifts. However, the most intriguing discovery lies in the model's prediction of a super-accelerated expansion in the distant future, in contrast to the de Sitter phase predicted by
Λ
\Lambda
Λ
CDM. This implies the presence of dark energy driving the universe's accelerated expansion. These findings suggest that our proposed cosmological model offers a compelling alternative to the
Λ
\Lambda
Λ
CDM paradigm, shedding new light on the nature of dark energy and the future fate of the cosmos.Comment: 10 figures, 2 table
Similar works
Full text
Available Versions
arXiv.org e-Print Archive
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:arXiv.org:2308.07354
Last time updated on 18/08/2023