Compact Stars Admitting Noether Symmetries in Energy-Momentum Squared Gravity

Sharif, M.; Gul, M. Zeeshan

doi:10.1155/2021/6663502

Cited by 28 publications

(2 citation statements)

References 63 publications

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“…Shamir and Naz [68] considered the Noether symmetry approach to examine the stability of anisotropic stellar structures in modified f  ( )gravity. We have further extended this work in modified f T ,  ( ) [69] and f T , 2  ( ) [70] theories and found that the obtained solutions depict the viability of proposed Noether symmetric scheme. Azmat and Zubair [71] employed a gravitational decoupling approach to study the geometry of PSR J1614-2230, PSR 1937 + 21 and SAXJ1808.4-3658 compact stars in this theory.…”

Section: Literature Reviewmentioning

confidence: 70%

Study of viable compact stellar structures in non-Riemannian geometry

Gul,

Sharif,

Arooj

2024

Phys. Scr.

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The main objective of this article is to investigate the viablecompact stellar structures in non-Riemannian geometry, i.e.,$f(\mathbb{Q},\mathbb{T})$ theory, where $\mathbb{Q}$ defines thenon-metricity and $\mathbb{T}$ represents trace of the stress-energytensor. For this purpose, we consider a static spherical spacetimewith anisotropic matter configuration to examine the geometry ofconsidered compact stars. A specific model of this theory is used toderive the explicit expressions of energy density and pressurecomponents that govern the relationship between matter and geometry.The unknown constants in the metric potentials are determined byusing the continuity of interior and exterior spacetimes to examinethe configuration of spherical stellar structures. Physicalparameters such as fluid characteristics, energy constraints andequation of state parameters are analyzed to examine the viabilityof the considered stellar objects. Further, the equilibrium stateand stability of the proposed stellar objects are evaluated usingthe Tolman-Oppenheimer-Volkoff equation, sound speed and adiabaticindex, respectively. The rigorous analysis and satisfaction ofnecessary conditions lead to the conclusion that the stellar objectsstudied in this framework are viable and stable.

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Section: Literature Reviewmentioning

confidence: 70%

Study of viable compact stellar structures in non-Riemannian geometry

Gul,

Sharif,

Arooj

2024

Phys. Scr.

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“…A number of research work in relativistic astrophysics using Finch-Skea metric has been done in various modified theories [47]- [52]. Sharif and Gul [53] investigated the geometry of compact stars admitting Noether symmetry technique in f (R, T 2 ) theory. They also analyzed the dynamics of gravitational collapse with different matter distributions and concluded that the modified terms reduce the collapse rate [54].…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Diabetes and Hypertension in Young females of Lahore College for Women University, Lahore

Sharif

Frasat

Naz

et al. 2021

LGUJLS

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Diabetes and hypertension are non-communicable diseases. Diabetes is a significant cause of early death and debility globally. The objective of the present study is to find out the percentage incidence of diabetes and hypertension in young females of Lahore College for Women University Jail Road, Lahore. This cross-sectional study was conducted, January 2017 to June 2017. It was included 200 subjects. The average age of the population under study was 20 ± 0.17 years. About 4.5% (n=9) of the population was pre-diabetic and all were obese. While, 36% (n=73) of population was suffering from prehypertension and 5% (n=10) with hypertension. Among a total of 83 subjects with elevated systolic blood pressure (SBP), 41 were overweight and obese. According to diastolic blood pressure (DBP) 7% (n=14) of the population was suffering from pre-hypertension and 6% (n=12) with hypertension. 26 subjects had elevated diastolic blood pressure and among these, 20 subjects were overweight and obese. The whole population is divided among 4 groups according to the age groups. Body mass index was moreprevalent in the age group 25-27 years. It is stated that overweight and obesity are strongly associated with diabetes and hypertension. It was concluded that increased BMI was the main predictor of diabetes and hypertension. However no diabetic patient were found in population and the prevalence of pre-diabetic subjects were 4.5 % and according to SBP and DBP 5% and 6 % of the population were hypertensive.

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Study of Charged Anisotropic Karmarkar Stars in f(R,T2)$f(\mathcal {R},\mathbb {T}^{2})$ Theory

Sharif

Gul

2023

Fortschritte der Physik

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This paper examines the viable attributes of charged compact stars with anisotropic matter configuration in ffalse(scriptR,T2false)$f(\mathcal {R},\mathbb {T}^{2})$ theory. For this purpose, we use the embedding class‐1 technique and consider a specific functional form of this modified theory, i.e, f(R,double-struckT2)=scriptR−γT2$f(\mathcal {R},\mathbb {T} ^{2})=\mathcal {R}-\gamma \mathbb {T}^{2}$ to examine the geometry of compact objects. The values of unknown parameters are found by the smooth matching of interior (static spherical metric) and exterior (Reissner‐Nordstrom metric of energy‐momentum squared gravity) spacetimes. We investigate the impact of effective fluid parameters anisotropy, equation of state parameters and energy bounds in the inner region of the charged stellar objects. The stability of the stellar models in the presence of charge is examined by speed of sound and adiabatic index. We find that embedding class‐1 solution is physically viable and stable for charged anisotropic stellar objects in this modified theory.

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Compact Stars Admitting Noether Symmetries in Energy-Momentum Squared Gravity

Cited by 28 publications

References 63 publications

Study of viable compact stellar structures in non-Riemannian geometry

Study of viable compact stellar structures in non-Riemannian geometry

Prevalence of Diabetes and Hypertension in Young females of Lahore College for Women University, Lahore

Study of Charged Anisotropic Karmarkar Stars in f(R,T2)$f(\mathcal {R},\mathbb {T}^{2})$ Theory

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