A Charged Compact Star Solution for a Conducting Sphere
Abstract
This paper considers the simplest charged stellar model, namely, a uniform density star with electric charge distributed on its surface. In this model, we treat the uniform density star as a conducting sphere, where all electric charges are uniformly distributed on the surface and represented by a delta function. We obtain an analytical solution for the background metric of the star spacetime and find that the pressure of the perfect fluid inside the star is directed inward (negative pressure) near the inner surface. This is because the repulsive force between surface electric charges requires an inward pressure to maintain equilibrium. However, when the charge becomes too large, the pressure of the ideal fluid at the stellar center gets directed outwards again. This is because the electric field itself is also a part of the stress energy tensor Tμν, acting as a source of gravity. When the gravitational effect of the electric field dominates, the perfect fluid must provide outward pressure to balance the inward gravitational attraction. On the other hand, we have also studied the axial perturbation in charged spacetimes using the finite difference method. We found that axial Maxwell perturbation and axial gravitational perturbation are coupled in the star spacetime, making it difficult to separate the variables by coordinate transformation. The computational results show that the waveforms of quasinormal modes vary with different charges.
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BibTeX
@misc{lin2026charged,
title = {{A Charged Compact Star Solution for a Conducting Sphere}},
author = {Kai Lin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.42051},
eprint = {2610.42051},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.42051},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - A Charged Compact Star Solution for a Conducting Sphere
AU - Kai Lin
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.42051
UR - https://arxiv.org/abs/2610.42051
AB - This paper considers the simplest charged stellar model, namely, a uniform density star with electric charge distributed on its surface. In this model, we treat the uniform density star as a conducting sphere, where all electric charges are uniformly distributed on the surface and represented by a delta function. We obtain an analytical solution for the background metric of the star spacetime and find that the pressure of the perfect fluid inside the star is directed inward (negative pressure) near the inner surface. This is because the repulsive force between surface electric charges requires an inward pressure to maintain equilibrium. However, when the charge becomes too large, the pressure of the ideal fluid at the stellar center gets directed outwards again. This is because the electric field itself is also a part of the stress energy tensor T_μν, acting as a source of gravity. When the gravitational effect of the electric field dominates, the perfect fluid must provide outward pressure to balance the inward gravitational attraction. On the other hand, we have also studied the axial perturbation in charged spacetimes using the finite difference method. We found that axial Maxwell perturbation and axial gravitational perturbation are coupled in the star spacetime, making it difficult to separate the variables by coordinate transformation. The computational results show that the waveforms of quasinormal modes vary with different charges.
ER -