A5068698906- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Relativity and Gravitational Theory
- Computational Physics and Python Applications
- Advanced Differential Geometry Research
- Astronomy and Astrophysical Research
- Noncommutative and Quantum Gravity Theories
- Advanced Thermodynamics and Statistical Mechanics
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Complex Systems and Time Series Analysis
- Astrophysical Phenomena and Observations
- Advanced Mathematical Physics Problems
- Quantum Chromodynamics and Particle Interactions
- Stochastic processes and financial applications
- Simulation Techniques and Applications
- Insurance, Mortality, Demography, Risk Management
Mohamed I University
2019-2024
Abstract In this study, the non-metricity scalar Q , which characterizes gravitational interaction, is used to analyze Universe’s rapid expansion within context of f ( ) gravity theory. We suggest an emergent scale factor, produces deceleration parameter in redshift form determines solution field equations FLRW Universe. evaluate appropriate values model parameters by considering SNIa from Pantheon, CMB Planck 2018, BAO, and 36 data points Hubble datasets using Markov Chain Monte Carlo...
In this paper, we investigate the accelerated expansion of Universe in context [Formula: see text] modified theory gravity, where is a non-metricity scalar which characterizes gravitational interaction by using parametrization deceleration parameter with text], and are free parameters constrained 57 points datasets, 1048 Pantheon, 10 from Baryon Acoustic Oscillations (BAO) datasets shift Planck 2018 Cosmic Microwave Background (CMB). purpose validating our model, proceed Om diagnostic energy...
Confirmation of accelerated expansion the universe probed concept dark energy theory, and since then, numerous models have been introduced to explain its origin nature. The present work is based on reconstructing by parametrization deceleration parameter in FRW filled with radiation, matter, energy. We chosen some well-motivated parametrized 1-3 an attempt investigate density terms parameters estimating cosmological help different observational datasets. Also, we a new model 4 for parameter....
Abstract In the current paper, a dark energy (DE) model reconstructed from well‐motivated deceleration parameter (DP) is analyzed. A flat FRW Universe filled with radiation, matter (DM), and fluids considered. The free parameters are constrained using measurements Supernovae, Hubble, Gamma Ray Bursts, Quasars, Baryon acoustic Oscillations. under study found to be very supported by observation respect ΛCDM since . Besides, cosmographic analysis performed showing that behaves similarly as...
We further investigate the dark energy model based on Finsler geometry inspired osculating Barthel-Kropina cosmology. The cosmological approach is introduction of a Barthel connection in an geometry, with having property that it Levi-Civita Riemannian metric. From generalized Friedmann equations model, obtained by assuming background metric Friedmann-Lemaitre-Robertson-Walker type, effective geometric component can be generated, effective, type pressure, satisfying linear barotropic equation...
ABSTRACT Recently, the scalar–tensor representation of f(R, T) gravity was used to explore gravitationally induced particle production/annihilation. Using framework irreversible thermodynamics open systems in presence matter creation/annihilation, physical and cosmological consequences this setup were investigated detail. In paper, we test observationally context aforementioned framework, using Hubble Pantheon + measurements. The best fit parameters are obtained by solving numerically...
Abstract In this paper, a well‐motivated parameterization of the Hubble parameter ( H ) is revisited that renders two models dark energy showing some intriguing features late‐time accelerating Universe. A general quintessence field considered as source energy. Tighter constraints using recently updated cosmic observational datasets for have been obtained. The described here show nice fit to uncorrelated datasets, Standard candles, Gamma Ray Bursts, Quasars, and Baryonic Acoustic Oscillations...
Abstract In this paper, we explore one of Einstein’s alternative formulations which involves the non-metricity scalar, Q , within framework f ( ) theory. Our study focuses on solving modified Friedmann equations for case dust matter, $$\rho =\rho _{m}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>ρ</mml:mi> <mml:mo>=</mml:mo> <mml:msub> <mml:mi>m</mml:mi> </mml:msub> </mml:mrow> </mml:math> and a form $$f(Q) = \alpha + \beta Q^n$$ <mml:mi>f</mml:mi>...
In this paper, we further investigate the cosmological tests of deceleration parameter [Formula: see text] with text], where and are free parameters in framework by using 31 measurements from CC datasets, 1048 type Ia Supernovae (SNeIa) 17 uncorrelated BAO Markov Chain Monte Carlo (MCMC). We obtained best fit value our model obtain analysis cosmographic studies model. The statistical revealed that is supported current Universe.
Abstract The paper is devoted to study the observational signatures of $$f(R,G,\mathcal {T})$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>f</mml:mi> <mml:mo>(</mml:mo> <mml:mi>R</mml:mi> <mml:mo>,</mml:mo> <mml:mi>G</mml:mi> <mml:mi>T</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> gravity in FRW universe. In this research article, we present a new cosmological model formulated within framework. To constrain parameters, employ Markov Chain Monte Carlo...
Constraining the dark energy deceleration parameter is one of fascinating topics in recent cosmological paradigm. This work aims to reconstruct using parametrization a flat FRW universe filled with radiation, energy, and pressure-less matter. Thus, we have considered four well-motivated parameterizations q(z), which can provide evolution scenario from acceleration phase Universe. We evaluated expression corresponding Hubble each by imposing it into Friedmann equation. constrained model...
The study analyzes five models derived from the Pacif parametrization scheme, a generalized form of Hubble parameter ($H$), yielding various forms deceleration (DP) that vary linearly, quadratically, cubically, quartically, and quintically. We aim to explore impact these DP variations on late-time evolution their potential alleviate cosmological tensions. Additionally, we enhance model constraints by introducing non-diagonal elements into covariance matrix, thereby simulating correlations...
In this paper, we employ parametrization techniques within the framework of [Formula: see text] gravity to investigate deceleration parameter (DP), a key quantity characterizing universe’s expansion dynamics. By analyzing DP, gain valuable insights into nature cosmic constituents and their impact on evolution. We utilize combination observational data, including 31 Cosmic Chronometers (CC) measurements, 1048 Type Ia Supernovae (SNIa), 17 Baryon Acoustic Oscillation (BAO) Microwave Background...