scholarly journals Determination of bending angle of light deflection subject to possible weak and strong quantum gravity effects

2020 ◽  
Vol 35 (29) ◽  
pp. 2050188
Author(s):  
Chenmei Xu ◽  
Yisong Yang
Keyword(s):  
Differential Equation ◽  
Quantum Gravity ◽  
Deflection Angle ◽  
Gravity Effect ◽  
Light Deflection ◽  
Bending Angle ◽  
Quantum Gravity Effect ◽  
Gravity Effects ◽  
The Deflection Angle

Explicit expressions for the bending angle of light deflection arising from phenomenologically deformed black hole metrics, subject to possible weak and strong quantum gravity effects, respectively, are obtained, by a highly effective method. The accuracy and effectiveness of these expressions are then illustrated by numerically solving the differential equation governing the deflection angle directly in the weak quantum-gravity effect situation.

scholarly journals Quantum Gravity Effects in Cosmology

2018 ◽  
Vol 168 ◽  
pp. 03001
Author(s):  
Je-An Gu ◽  
Sang Pyo Kim ◽  
Che-Min Shen
Keyword(s):  
Power Spectrum ◽  
Quantum Gravity ◽  
Effective Temperature ◽  
Quantum Cosmology ◽  
Hawking Temperature ◽  
Gravity Effect ◽  
Probe Field ◽  
Quantum Gravity Effect ◽  
Gravity Effects ◽  
Spacetime Fluctuations

Within the geometrodynamic approach to quantum cosmology, we studied the quantum gravity effects in cosmology. The Gibbons-Hawking temperature is corrected by quantum gravity due to spacetime fluctuations and the power spectrum as well as any probe field will experience the effective temperature, a quantum gravity effect.

Gravitational analysis of neutral regular black hole in Rastall gravity

2020 ◽  
Vol 35 (27) ◽  
pp. 2050225 ◽  
Author(s):  
Riasat Ali ◽  
Muhammad Asgher ◽  
M. F. Malik
Keyword(s):  
Black Hole ◽  
Wave Equation ◽  
Quantum Gravity ◽  
Generalized Uncertainty Principle ◽  
Gravity Effect ◽  
Tunneling Radiation ◽  
Regular Black Hole ◽  
Quantum Gravity Effect ◽  
Stability And Instability ◽  
The Stability

This paper is devoted to the tunneling radiation and quantum gravity effect on tunneling radiation of neutral regular black hole in Rastall gravity. We analyzed the tunneling radiation and Hawking temperature of neutral regular black hole by applying the Hamilton-Jacobi ansatz phenomenon. Lagrangian wave equation have been investigated by generalized uncertainty principle (GUP), using the WKB-approximation and calculated the tunneling rate as well as temperature. Furthermore, we analyzed the temperature of this neutral regular black hole in the presence of gravity. The stability and instability of neutral regular black hole are also analyzed.

scholarly journals Testing Einstein’s formula for gravitational deflection of light based on lightcurves of microlensed sources

2019 ◽  
pp. 16-20
Author(s):  
A.N. Alexandrov ◽  
V.I. Zhdanov ◽  
V.M. Sliusar
Keyword(s):  
Impact Parameter ◽  
Deflection Angle ◽  
Light Deflection ◽  
Classical Formula ◽  
Deflection Of Light ◽  
Gravitational Deflection Of Light ◽  
The Deflection Angle ◽  
The Impact ◽  
Gravitational Deflection

We propose a new test of the Einstein’s formula for the gravitational light deflection using the Galactic microlensing. In this classical formula, the deflection angle ∆ϕ is inversely proportional to the impact parameter p of incoming photons travelling from infinity.

scholarly journals Deflection of light by a Coulomb charge in Born–Infeld electrodynamics

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Jin Young Kim
Keyword(s):  
Black Hole ◽  
Electric Field ◽  
Deflection Angle ◽  
Strong Electric Field ◽  
Background Field ◽  
Geodesic Equation ◽  
Bending Angle ◽  
Propagation Of Light ◽  
The Deflection Angle ◽  
Trajectory Equation

AbstractWe study the propagation of light under a strong electric field in Born–Infeld electrodynamics. The nonlinear effect can be described by the effective indices of refraction. Because the effective indices of refraction depend on the background electric field, the path of light can be bent when the background field is non-uniform. We compute the bending angle of light by a Born–Infeld-type Coulomb charge in the weak lensing limit using the trajectory equation based on geometric optics. We also compute the deflection angle of light by the Einstein–Born–Infeld black hole using the geodesic equation and confirm that the contribution of the electric charge to the total bending angle agree.

scholarly journals Quantum gravity effect in torsion driven inflation and CP violation

2015 ◽  
Vol 2015 (10) ◽  
Author(s):  
Sayantan Choudhury ◽  
Barun Kumar Pal ◽  
Banasri Basu ◽  
Pratul Bandyopadhyay
Keyword(s):  
Cp Violation ◽  
Quantum Gravity ◽  
Gravity Effect ◽  
Quantum Gravity Effect

scholarly journals Gravitational bending angle with finite distances by Casimir wormholes

2021 ◽  
Author(s):  
Í. D. D. Carvalho ◽  
G. Alencar ◽  
C. R. Muniz
Keyword(s):  
Uncertainty Principle ◽  
Deflection Angle ◽  
Generalized Uncertainty Principle ◽  
Casimir Energy ◽  
Type Ii ◽  
Bending Angle ◽  
Test Particles ◽  
Self Consistent ◽  
The Deflection Angle ◽  
Jacobi Metric

In this paper, we investigate the gravitational bending angle due to the Casimir wormholes, which consider the Casimir energy as the source. Furthermore, some of these Casimir wormholes regard Generalized Uncertainty Principle (GUP) corrections of Casimir energy. We use the Ishihara method for the Jacobi metric, which allows us to study the bending angle of light and massive test particles for finite distances. Beyond the uncorrected Casimir source, we consider many GUP corrections, namely, the Kempf, Mangano and Mann (KMM) model, the Detournay, Gabriel and Spindel (DGS) model, and the so-called type II model for the GUP principle. We also find the deflection angle of light and massive particles in the case of the receiver and the source are far away from the lens. In this case, we also compute the optical scalars: convergence and shear for these Casimir wormholes as a gravitational weak lens. Our self-consistent iterative calculations indicate corrections to the bending angle by Casimir wormholes in the previous paper.

scholarly journals Quantum Gravity effect on the Quark-Gluon Plasma

2014 ◽  
Vol 2014 (1) ◽  
pp. 1-6 ◽  
Author(s):  
A. Tawfik ◽  
◽  
L. I. Abou-Salem ◽  
I. Elmashad ◽  
Jameel-Un Nabi ◽  
...  
Keyword(s):  
Quantum Gravity ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Gravity Effect ◽  
Quantum Gravity Effect

scholarly journals Testing Horndeski Theory Using Light Deflection by Asymptotically Flat Black Holes

2019 ◽  
Author(s):  
Wajiha Javed ◽  
Jameela Abbas ◽  
Yashmitha Kumaran ◽  
Ali Övgün
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Deflection Angle ◽  
Weak Field ◽  
Light Deflection ◽  
Plasma Medium ◽  
Asymptotically Flat ◽  
Optical Geometry ◽  
The Deflection Angle ◽  
Bonnet Theorem

The principal objective of this project is to investigate the gravitational lensing by asymptotically flat black holes in the framework of Horndeski theory in weak field limits. To achieve this objective, we utilize the Gauss-Bonnet theorem to the optical geometry of asymptotically flat black holes and applying the Gibbons-Werner technique to achieve the deflection angle of photons in weak field limits. Subsequently, we manifest the influence of plasma medium on deflection of photons by asymptotically flat black holes in the context of Horndeski theory. We also examine the graphical impact of deflection angle on asymptotically flat black holes in the background of Horndeski theory in plasma as well as non-plasma medium.

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