Meetings 2026

To find out more about the group, email Mike Witt: mike (at) physicscafe (dot) org

Upcoming

[October 11th]: No meeting

[October 18th]: Quantum Information

Past

[October 4th]: Quantum Information

[September 27th]: Open Discussion. Come if you can.
We’ll use the same Zoom link as last week’s meeting.

[September 20th]: Quantum Information

[September 13th]: Proposition 13 (Parabolic Orbit)

[September 6th]: Einstein Field Equations (Collier 7.6)

[August 30th]: A Simple Nash Equilibrium

[August 23rd]: The Stress-Energy Tensor (Dust and Perfect Fluids; Collier 7.5.1 – 7.5.2)

[August 16th]: The Stress-Energy Tensor Components (Collier 7.5)

[August 9th]: The Stress-Energy Tensor (Collier 7.5)

[August 2nd]: Principia, Proposition 12 (Hyperbolic Orbit)

[July 26th]: Principia: finish Proposition 11, plus Conics Overview

[July 19th]: Principia, Proposition 11 (Focus-Centered Elliptical Orbit)

[July 12th]: Principia, Proposition 10 (Sun-Centered Elliptical Orbit)

[June 28th]: Geodesics in spacetime (Collier 7.4)

[June 14th]: Spacetime (and maybe Geodesics) (Collier 7.3, maybe 7.4)

[June 7th]: Three key principles of GR, ̶a̶n̶d̶ ̶S̶p̶a̶c̶e̶t̶i̶m̶e̶ (Collier 7.1 – 7.2)

[May 31st]: The Ricci tensor and Ricci scalar

[May 17th]: Riemann curvature tensor for a spherical surface

[May 10th]: Geodesic Problems Review

[May 3rd]: Review Collier chapter 6

[April 26th]: Open Meeting

[April 19th]: Proposition 9 (the Force Law for an Equiangular Spiral)

[April 12th]: Proposition 7 (Finding the Force Law for a Circle, with Off-center Sun)

[April 5th]: NO MEETING

[March 29th]: Continue Collier chapter 6

[March 22nd]: Continue Collier chapter 6

[March 15th]: Start on Collier chapter 6

[March 8th]: Tensor review, start on curvature

[March 1st]: GR Continues

[Feb 22nd]: GR Continues

[Feb 15th]: GR Continues

[Feb 8th]: GR Continues – Flowchart and planning session

[Feb 1st]: GR Continues – More on Vectors and One-Forms

[January 25th]: Tensor Homework Discussion – Tensor Homework #1

[January 18th]: Tensor Intro Review – Preparing for derivatives of Tensors

[January 11th]: Principia: Proposition 6 – Finding the Centripetal Force for Any Orbit

[January 4th] New Year Social