Abstract
In this thesis, using general relativity, the null geodesics and black hole shadow of a spherically symmetric configuration of a black hole (surrounded by a dark matter shell) are studied. First, the standard
results of the photon sphere of Schwarzschild de-Sitter black hole is revisited and analyzed more carefully. Secondly, using an ansatz (piecewise metric function) commonly used in the literature to describe the mass distribution of the spherically symmetric black hole - dark matter configuration, the null geodesics through vacuum and dark matter are analyzed. Assuming an observer located at a finite distance from the black hole outside the dark matter shell, the black hole shadow angle is calculated exactly. Next, the mass of the dark matter shell is constrained numerically using the metric function and the photon spheres. These constraints are then used to show the dependence of the black hole shadow angle on the dark matter mass and on the observer distance.
School
School of Sciences and Engineering
Department
Physics Department
Degree Name
MS in Physics
Graduation Date
Summer 6-15-2022
Submission Date
2-15-2022
First Advisor
Ahmed Hamed
Second Advisor
Mohammad AlFiky
Committee Member 1
Adel Awad
Committee Member 2
Ashraf ElFiqi
Committee Member 3
Mohamed Orabi
Extent
64 p.
Document Type
Master's Thesis
Institutional Review Board (IRB) Approval
Approval has been obtained for this item
Recommended Citation
APA Citation
Ibrahim, A.
(2022).Shadows of a Schwarzschild Black Hole Surrounded by a Spherically Symmetric Dark Matter [Master's Thesis, the American University in Cairo]. AUC Knowledge Fountain.
https://fount.aucegypt.edu/etds/1902
MLA Citation
Ibrahim, Ahmad. Shadows of a Schwarzschild Black Hole Surrounded by a Spherically Symmetric Dark Matter. 2022. American University in Cairo, Master's Thesis. AUC Knowledge Fountain.
https://fount.aucegypt.edu/etds/1902