Mathematical Foundations
Master the essential mathematics underlying general relativity, cosmology, and quantum gravity. From tensor calculus to differential geometry, functional analysis to Lie groupsβall the tools you need for advanced gravitational physics.
EigenChris: Tensor Calculus Series
The most popular visual introduction to tensors and differential geometry on YouTube! 43 comprehensive lectures covering everything from basic tensors through the Riemann curvature tensor.
Watch 43 Video LecturesβTensor Calculus
Tensors, indices, covariant and contravariant vectors, tensor operations, Einstein summation convention.
Differential Geometry
Manifolds, tangent spaces, metrics, connections, curvature, geodesics, and parallel transport.
Lie Groups & Algebras
Symmetry groups, Lie algebras, representations, SO(3), SU(2), Lorentz group, gauge transformations.
Variational Calculus
Euler-Lagrange equations, action principles, Noether's theorem, Hamilton's formalism, field theory.
Functional Analysis
Hilbert spaces, operators, spectral theory, distributions, Sobolev spaces for quantum gravity.
Complex Analysis
Holomorphic functions, contour integration, residue theorem, conformal maps, applications to physics.
Why These Mathematical Tools?
For General Relativity:
GR is fundamentally a geometric theory. You need tensor calculus to express physical laws in curved spacetime, differential geometry to understand manifolds and curvature, andvariational calculus to derive Einstein's equations from the Einstein-Hilbert action.
For Cosmology:
Cosmological models use differential geometry for the FLRW metric and spacetime symmetries.Lie groups describe the symmetries of homogeneous and isotropic spacetimes.Variational methods are essential for deriving equations of motion for scalar fields in inflation.
For Quantum Gravity:
Loop quantum gravity requires functional analysis for infinite-dimensional Hilbert spaces,Lie groups (especially SU(2)) for spin networks, and differential geometryfor connections and gauge theory. String theory uses complex analysis and conformal field theory.
Related Physics Courses
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Recommended Learning Path
Start with Tensor Calculus
Master index notation, Einstein summation, and basic tensor operations.
Move to Differential Geometry
Learn manifolds, metrics, connections, and curvatureβthe language of GR.
Study Variational Calculus
Understand action principles and how field equations are derived.
Explore Lie Groups & Symmetries
Learn gauge theory, symmetry groups, and their role in physics.
Advanced: Functional Analysis
For quantum gravity and quantum field theory in curved spacetime.