Greybody factor for a static spherically symmetric black hole with non-linear electrodynamics

Sharif, M.; Raza, Asma

doi:10.1016/j.aop.2022.168920

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…For many years, the research on BH physics has attracted the attention of physicists and astronomers. Different types of black holes, such as static BHs [38], dynamic BHs [39], spherically symmetric BHs [40], axially symmetric BHs [41], and exotic BHs [42], have been intensively discussed. The study of the thermodynamic laws of BH areas suggests that black holes, as special celestial bodies, seem to have thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Properties of Spherically Symmetric Black Holes in the Generalized Brans–Dicke Modified Gravitational Theory

Yang

et al. 2023

Entropy

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The many problems faced by the theory of general relativity (GR) have always motivated us to explore the modified theory of GR. Considering the importance of studying the black hole (BH) entropy and its correction in gravity physics, we study the correction of thermodynamic entropy for a kind of spherically symmetric black hole under the generalized Brans–Dicke (GBD) theory of modified gravity. We derive and calculate the entropy and heat capacity. It is found that when the value of event horizon radius r+ is small, the effect of the entropy-correction term on the entropy is very obvious, while for larger values r+, the contribution of the correction term on entropy can be almost ignored. In addition, we can observe that as the radius of the event horizon increases, the heat capacity of BH in GBD theory will change from a negative value to a positive value, indicating that there is a phase transition in black holes. Given that studying the structure of geodesic lines is important for exploring the physical characteristics of a strong gravitational field, we also investigate the stability of particles’ circular orbits in static spherically symmetric BHs within the framework of GBD theory. Concretely, we analyze the dependence of the innermost stable circular orbit on model parameters. In addition, the geodesic deviation equation is also applied to investigate the stable circular orbit of particles in GBD theory. The conditions for the stability of the BH solution and the limited range of radial coordinates required to achieve stable circular orbit motion are given. Finally, we show the locations of stable circular orbits, and obtain the angular velocity, specific energy, and angular momentum of the particles which move in circular orbits.

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Section: Introductionmentioning

confidence: 99%

Properties of Spherically Symmetric Black Holes in the Generalized Brans–Dicke Modified Gravitational Theory

Yang

et al. 2023

Entropy

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“…Several minimally and non-minimally coupled BHs in de Sitter spacetime have been studied with different considerations which give life span of the BHs [35]- [37]. Recently, we have studied the GBF of a static spherically symmetric BH with non-linear electrodynamics and found that the non-linear charge parameter increases the absorption probability of the BH [38].…”

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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Greybody factor for a non accelerated charged modified black hole in anti-de sitter regime

Sharif,

Raza

2024

Chinese Journal of Physics

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Greybody factor for a static spherically symmetric black hole with non-linear electrodynamics

Cited by 3 publications

References 29 publications

Properties of Spherically Symmetric Black Holes in the Generalized Brans–Dicke Modified Gravitational Theory

Properties of Spherically Symmetric Black Holes in the Generalized Brans–Dicke Modified Gravitational Theory

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

Greybody factor for a non accelerated charged modified black hole in anti-de sitter regime

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