Related Experiment Video
Updated: Oct 22, 2025
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.8K
Anisotropic Strange Star in 5D Einstein-Gauss-Bonnet Gravity
Mahmood Khalid Jasim1, Sunil Kumar Maurya1, Ksh Newton Singh2
1Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, P.O. Box 33, Nizwa PC 616, Oman.
Entropy (Basel, Switzerland)
|August 27, 2021
Summary
This study presents a new anisotropic strange star model in 5D Einstein-Gauss-Bonnet gravity. The model demonstrates physical viability and stability, with properties depending on the Gauss-Bonnet coupling constant.
Area of Science:
- Astrophysics
- Theoretical Physics
- Gravitational Physics
Background:
- Strange stars are hypothetical compact objects composed of strange quark matter.
- Einstein-Gauss-Bonnet (EGB) gravity is a modification of Einstein's theory of general relativity in higher dimensions.
Purpose of the Study:
- To investigate a novel anisotropic strange star model within 5D EGB gravity.
- To explore the physical viability and stability of such a model.
Main Methods:
- Utilized a linear equation of state (EOS) pr=βρ+γ.
- Employed a well-behaved ansatz for the gravitational potential.
- Matched parameters with the Boulware-Deser solution at the boundary.
- Applied a modified Tolman-Oppenheimer-Volkoff (TOV) equation for hydrostatic equilibrium.
Main Results:
- Derived expressions for gravitational potentials and thermodynamical variables (pressure, energy density).
- Confirmed the physical viability and dynamical stability of the strange star model.
- Established a mass-radius relationship, showing dependence on the Gauss-Bonnet coupling constant (α).
Conclusions:
- The developed anisotropic strange star model in 5D EGB gravity is physically plausible.
- Model parameters and characteristics, including compactness and surface redshift, are influenced by the Gauss-Bonnet coupling constant.
- The model remains within theoretical limits, such as the Buchdahl limit.
Related Concept Videos
01:26Gauss's Law: Spherical Symmetry
8.3K
A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
8.3K
01:20Gauss's Law: Cylindrical Symmetry
8.5K
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
8.5K
01:14Gravitation Between Spherically Symmetric Masses
1.0K
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
1.0K
01:27Gauss's Law: Planar Symmetry
8.7K
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
8.7K
01:21Schwarzschild Radius and Event Horizon
2.3K
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
2.3K
01:07Gauss's Law
8.5K
If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
8.5K