Course Name
Paradigms in Physics: Central Forces
Course Number
ph426
Year/Term
Spring-2026
Course Credits
4
Class meeting times
8 hours of lecture/discussion per week for five weeks.
Prerequisites
PH213, PH425, PH422
Course description
Gravitational and electrostatic forces; angular momentum and spherical harmonics, separation of variables in classical and quantum mechanics, hydrogen atom.
Topic/Day
Activities
Resources
Homework Due
W1 D1: Math Bits
Unit: Math Bits (PDEs)
Introduction to the Unit
Learning Outcomes
Unit Learning Outcomes: Partial Differential Equations (Math Bits)
Unit: Math Bits (Power Series Solutions of ODEs)
Introduction to the Unit
Learning Outcomes
Unit Learning Outcomes: Power Series Solutions of ODEs (Math Bits)
W1 D2: Math Bits
W1 D3: Math Bits
Vector Spaces/Inner Products (Review)
Legendre Polynomial Series
Guessing Legendre Coefficients Expanding a Function in Legendre Polynomials.
W1 D4: Math Bits
Separation of Variables
Curvilinear
Separation of Variables - Spherical Harmonics
Legendre's Associated Equation
Theorems about Power Series Solutions
W1 D5: Math Bits
Series Solutions for Legendre Polynomials
W2 D1
Separation of Variables
Rectangular (Review)
Unit: Classical Mechanics Orbits
W2 D2
Systems of Particles
GCF: Systems of Particles
Taylor Chap. 3 (Optional)
Central Force Lagrangians
Reduced Mass
GCF: Reduced Mass
Taylor 8.2
W2 D3
Solutions of the Harmonic Oscillator Equation (Review)
Angular Momentum
Angular Momentum SWBQ Planar Orbit
Conservation of
Classical Angular Momentum
W2 D4
Equations of Motion
Change of Variables
Polar Graphs
Circles, Ellipses, Hyperbolas
Orbit Shape
Spherical/Polar Coordinates
(Review)
Curvilinear Coordinates Introduction Curvilinear Basis Vectors
GCF: Coordinates
Video: Basis Vectors (Review from PH 335/422)
W2 D5
W3 D1
More Effective Potentials
Inverse Square Forces:
Kepler's First Law
Effective Potentials
Effective Potential Diagrams, version 1
Taylor 8.4 (Optional)
GCF: Effective Potentials
W3 D2
Unit: Quantum Mechanics on the Ring
W3 D3
Time Dependence Review
Time Evolution Refresher (Mini-Lecture) Time Evolution of the ISW
Introduction to Particle on a Ring
Intro to Particle on a Ring
Separating out Center-of-Mass: Quantum
GCF: Reduced Mass
McIntyre 7.1
Eigenstates on a Quantum Ring
GCF: Motion on a Ring
McIntyre 7.5
W3 D4
Normalization of Eigenstates on the Ring
W3 D5
Extra Time Dependent Ring Activities
Meaning of the Wave Function
W4 D1
MEMORIAL DAY
No Class
Unit: Angular Momentum in Quantum Mechanics
Introduction to the Unit
Learning Outcomes
W4 D2
Quantum Ring with Separation of Variables
McIntyre 7.5
Schrödinger's Equation:
Spherical Symmetry
W4 D3
Spherical Harmonics:
Properties
GCF: Spherical Harmonics
McIntyre 7.6.4
W4 D4
W4 D5
Rigid Rotor Probabilities & Degeneracy
Probabilities for a Quantum Particle on a Unit Sphere in Spherical Harmonic Functions
W5 D1
Symmetries, Parity, Degeneracy
Unit: Quantum Mechanics of the Hydrogen Atom
Introduction to the Unit
Learning Outcomes
W5 D2
Commutation Relations
Angular Momentum Commutation Relations: Lecture
The Radial Equation
McIntyre 8.1-8.4
GCF: The Radial Equation
W5 D3
W5 D4
Hydrogen Spectra
McIntyre 8.3
W5 D5
Final Exam
FINAL EXAM