Article
Materials Science, Multidisciplinary
T. Vinutha, K. Sri Kavya
Summary: In this study, the LRS Bianchi-I spatially homogeneous and anisotropic perfect fluid cosmological model was investigated in f(R, T) theory. The deceleration parameter and its relationship with energy conditions and pressure were examined, showing the significance of a specific constant n in explaining the expansion of the universe. Results suggested that n = 2 is the best fit for the model.
RESULTS IN PHYSICS
(2021)
Article
Physics, Mathematical
M. Koussour, M. Bennai
Summary: This paper presents a spatially homogeneous and anisotropic cosmological model with a viscous bulk fluid in f(R,T) gravity. The field equations are solved explicitly, and the behavior of the deceleration parameter is discussed, revealing two phases in the universe. The paper also calculates various physical and geometric properties and discusses the energy conditions and the Om(z) analysis.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Anil Kumar Yadav, Avinash K. Yadav, Manvinder Singh, Rajendra Prasad, Nafis Ahmad, Kangujam Priyokumar Singh
Summary: This study investigates a bulk viscous universe with dominance of dark energy in Bianchi type I space-time and constrains its parameters using observational data, showing tensions with the corresponding Planck collaboration values. The derived model exhibits transitioning properties and has constraints that marginally depart from the ΛCDM model of the universe.
Article
Physics, Mathematical
Y. S. Solanke, A. P. Kale, D. D. Pawar, V. J. Dagwal
Summary: We investigate LRS Bianchi type-I cosmological model in f(Q,T) theory of gravity with observational constraints. Two different functional forms of f(Q,T) = AQ + BT and f(Q,T) = AQ(n) + BT are considered, where A, B and n are model parameters. The best-fit values of constant parameters are obtained using least square method for observational constraints, and the available datasets such as Hubble dataset H(z), JLA, Pantheon, etc., are used by applying Root Mean Squared Error (RMSE) formula.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Physics, Nuclear
Anirudh Pradhan, Archana Dixit, Gunjan Varshney
Summary: In this research, a spatially homogeneous anisotropic locally rotationally symmetric cosmological model in f(R,T) gravity is analyzed. The study examines the physical and dynamic characteristics of these models and compares them with observational data to understand the geometric dynamics and accelerated expansion of the Universe.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Astronomy & Astrophysics
Bishnu Prasad Brahma, Mukunda Dewri
Summary: This paper deals with a cosmological model of a bulk viscous Bianchi type-V universe in Lyra geometry based on f(R, T) gravity, considering a time dependent displacement field. The nature and physical properties of the model are determined by using the linear form f(R, T) = f(1)(R) + f(2)(T) proposed by Harko et al. The kinematical properties of the model in the presence of bulk viscosity are also discussed. The evolution and behavior of energy conditions are studied in order to explain the late-time cosmic acceleration.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
Article
Astronomy & Astrophysics
Vijay Singh, Aroonkumar Beesham
Summary: Studied a spatially homogeneous and anisotropic locally-rotationally-symmetric Bianchi type-I spacetime model with strange quark matter (SQM) and a variable cosmological term Lambda(t) in f(R, T) theory. The model presents a cosmological scenario of transition from early deceleration to late time acceleration, suggesting the possibility of SQM as an alternative to dark energy. The physical viability of the model raises concerns about observational inconsistency.
Article
Multidisciplinary Sciences
Anirudh Pradhan, Archana Dixit, Dinesh Chandra Maurya
Summary: In this article, an anisotropic viscous cosmological model with f(Q) gravity is considered. The modified f(Q) gravity is investigated by applying observational constraints on the apparent magnitude. The results show that the universe undergoes accelerated expansion at late times, with dark energy dominating and an estimated current age of about 13.6 billion years.
Article
Physics, Mathematical
A. A. Coley, R. J. Van den Hoogen
Summary: Using a recently developed algorithm, we determine the completely general Bianchi type I teleparallel geometry, with preferred coordinates and a preferred co-frame. The remaining gauge freedom is allocated to the choice of spin connection. By solving the symmetry constraints on the spin connection, a general class of Bianchi type I teleparallel geometries is derived. This general class naturally breaks into two sub-classes, and we provide examples in F(T) teleparallel gravity to illustrate the differences.
JOURNAL OF MATHEMATICAL PHYSICS
(2023)
Article
Physics, Mathematical
Y. S. Solanke, D. D. Pawar, V. J. Dagwal
Summary: This paper investigates the LRS Bianchi type I metric in the presence of perfect fluid and dark energy, obtaining two different cosmological models with constant values of deceleration parameter. The physical behaviors of these models are discussed using MATLAB.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2021)
Article
Physics, Mathematical
A. B. Mehmood, Fiaz Hussain, M. Ramzan, M. Faryad, M. Jamil Khan, S. Malik
Summary: This paper investigates the proper conformal vector fields (CVFs) of Bianchi type-I perfect fluid space-times in the f(R, T) theory of gravity, and concludes that the overall dimension of CVFs for the Bianchi type-I space-times is 3, 4, 5, and 15.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Divya Jyoti, Sachin Kumar
Summary: The f(R, T) theory of gravity explains dark energy and the observed late-time acceleration of the universe without the need for a cosmological constant. It has passed the solar system test and is considered an alternative to dark matter. By considering non-minimal matter-geometry coupling, we obtained accelerating solutions of Einstein's field equations in f(R, T) gravity theory for a Bianchi I spacetime with a perfect fluid. Using the classical Lie symmetry method, we obtained exact solutions in terms of arbitrary functions and represented them graphically. Additionally, conservation laws of Einstein's equations in f(R, T) gravity were derived.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
A. H. A. Alfedeel, R. K. Tiwari
Summary: This paper investigates the exact solutions of a perfect fluid Bianchi type-I cosmological model in the context of f(R,T) = R + lambda T gravity. The study shows that the modeled universe asymptotically becomes isotropic at late times. The approach presented in this paper is novel and has not been previously carried out by other authors.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Ahmed M. Al-Haysah, A. H. Hasmani
Summary: In this paper, the Bianchi type-I string cosmological model is studied by combining Kaluza-Klein (KK) theory and f (R) theory of gravity. Various forms of the function f(R) are assumed to obtain physically significant and viable solutions, and some physical and geometrical properties of the model are discussed.
Article
Physics, Multidisciplinary
Mrinnoy M. Gohain, Kalyan Bhuyan
Summary: In this paper, exact solutions to the Raychaudhuri equation in the presence of a bulk viscous fluid in f(R, T) modified gravity were derived. The obtained solutions for two cases, general relativity (GR) and non-GR, can describe a non-singular inflationary Universe, known as the Emergent Universe (EU). It was found that the Einstein static (ES) radius of the EU depends on viscosity parameters and the parameter associated with the f(R, T) model. Furthermore, the inflationary evolution of the model was studied in relation to the Equation of State (EoS) parameter and found to be consistent with the BICEP2-Keck-Planck (BKP) data.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Astronomy & Astrophysics
A. K. Biswal, K. L. Mahanta, P. K. Sahoo
ASTROPHYSICS AND SPACE SCIENCE
(2015)
Article
Physics, Multidisciplinary
P. K. Sahoo, K. L. Mahanta, D. Goit, A. K. Sinha, S. S. Xulu, U. R. Das, A. Prasad, R. Prasad
CHINESE PHYSICS LETTERS
(2015)
Article
Physics, Particles & Fields
Binaya K. Bishi, K. L. Mahanta
ADVANCES IN HIGH ENERGY PHYSICS
(2015)
Article
Physics, Multidisciplinary
S. K. Tripathy, K. L. Mahanta
EUROPEAN PHYSICAL JOURNAL PLUS
(2015)
Article
Astronomy & Astrophysics
Koijam Manihar Singh, K. L. Mahanta
ASTROPHYSICS AND SPACE SCIENCE
(2016)
Article
Physics, Multidisciplinary
K. L. Mahanta, A. K. Biswal, P. K. Sahoo
CANADIAN JOURNAL OF PHYSICS
(2014)
Article
Physics, Multidisciplinary
Parbati Sahoo, Barkha Taori, K. L. Mahanta
CANADIAN JOURNAL OF PHYSICS
(2020)
Article
Astronomy & Astrophysics
Koijam Manihar Singh, K. L. Mahanta, Longjam Parbati Devi, R. R. Sahoo
MODERN PHYSICS LETTERS A
(2020)
Article
Multidisciplinary Sciences
Binaya K. Bishi, Aroonkumar Beesham, K. L. Mahanta
Summary: This manuscript discusses the study of the FLRW universe, domain walls, and quark matter in f(R, T) gravity, obtaining exact solutions under specific assumptions. Physical quantities in cosmological models are graphically analyzed, and the solutions obtained here can reduce to solutions in other gravitational theories with suitable parameter choices.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A-SCIENCE
(2021)
Article
Chemistry, Physical
Binaya K. Bishi, Aroonkumar Beesham, Kamal L. Mahanta
Summary: In this work, FLRW cosmological models in f(R, T) gravity are developed and the discussion includes the varying deceleration parameter and its consistency with observational data.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2022)
Article
Astronomy & Astrophysics
Rakesh Ranjan Sahoo, Kamal Lochan Mahanta, Saibal Ray
Summary: This study explores exact solutions to field equations in the f(R,T) theory of gravity for five-dimensional locally rotationally symmetric Bianchi-I spacetime, finding that the equation of state parameter is governed by the parameter mu. Fine-tuning mu allows for the effect of phantom energy in the model, while restricting the parameter is necessary for stability.
Article
Physics, Multidisciplinary
P. K. Sahoo, I. Radinschi, K. L. Mahanta
INDIAN JOURNAL OF PHYSICS
(2020)
Article
Engineering, Multidisciplinary
G. Mahanta, M. Das, S. Shaw, K. L. Mahanta
JOURNAL OF ENGINEERING SCIENCE AND TECHNOLOGY
(2019)
Article
Physics, Multidisciplinary
K. L. Mahanta, S. K. Tripathy
ROMANIAN JOURNAL OF PHYSICS
(2015)