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Physics
Foundational Physics
General Relativity
1. Foundations of General Relativity
2. The Principles of General Relativity
3. Mathematical Framework: Tensor Calculus and Differential Geometry
4. The Einstein Field Equations
5. Exact Solutions to the Einstein Field Equations
6. Black Holes
7. Gravitational Waves
8. Relativistic Cosmology
9. Advanced Topics and Current Research
Mathematical Framework: Tensor Calculus and Differential Geometry
Manifolds and Coordinate Systems
Definition of a Differentiable Manifold
Topological Spaces
Smooth Structure
Examples of Manifolds
Coordinate Systems and Charts
Local Coordinates
Atlas of Charts
Transition Functions
Coordinate Transformations
Tangent Spaces
Tangent Vectors
Geometric Definition
Algebraic Definition
Directional Derivatives
Basis Vectors
Coordinate Basis
Change of Basis
Cotangent Spaces
Dual Vectors
One-Forms
Coordinate Basis for Cotangent Space
Tensor Analysis
Introduction to Tensors
Vectors as Contravariant Tensors
One-forms as Covariant Tensors
General Tensors
Rank and Type of Tensors
Mixed Tensors
Tensor Algebra
Tensor Addition
Scalar Multiplication
Outer Product
Tensor Product
Antisymmetrization and Symmetrization
Contraction
Index Contraction
Trace Operations
Raising and Lowering Indices
Role of the Metric Tensor
Musical Isomorphisms
The Metric Tensor
Definition and Properties
Bilinear Form
Symmetry Properties
Non-degeneracy
Calculating Distances and Angles
Line Element
Proper Time and Proper Distance
Arc Length
The Signature of the Metric
Lorentzian Signature
Riemannian vs. Pseudo-Riemannian
Sign Conventions
Examples of Metrics
Minkowski Metric
Euclidean Metric
Spherical Coordinates
Covariant Differentiation
The Need for Covariant Derivatives
Failure of Ordinary Derivatives
Coordinate Independence
The Covariant Derivative
Definition and Properties
Leibniz Rule
Linearity
Christoffel Symbols
Connection Coefficients
Transformation Properties
Metric Compatibility
Parallel Transport
Transporting Vectors Along Curves
Path Dependence
Holonomy
Geodesic Equation
Derivation from Parallel Transport
Variational Principle
Affine Parameter
Curvature Tensors
The Riemann Curvature Tensor
Definition via Commutator
Geometric Interpretation
Symmetries and Properties
Antisymmetry Properties
Cyclic Identity
Bianchi Identities
The Ricci Tensor
Contraction of the Riemann Tensor
Physical Interpretation
Symmetry Properties
The Ricci Scalar
Further Contraction
Scalar Curvature
The Weyl Tensor
Conformal Curvature
Traceless Part of Riemann Tensor
Gravitational Waves
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2. The Principles of General Relativity
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4. The Einstein Field Equations