1. Albert Einstein and 100 Years of Relativity
Christopher M. Johns-Krull
Rice University, Dept. of Physics and Astronomy
October 24, 2016

2. “Straight” Lines in Curved Spacetime
If you are floating freely, then your worldline is following the straightest possible path through spacetime. If you feel weight, then you are not on the straightest possible path.
He actually first tried an offset circle. 2

3. What is an Orbit?
He actually first tried an offset circle.

4. A New Understanding of Gravity

5. An Orbit is a Straight Path Through Curved Spacetime
He actually first tried an offset circle.

6. A New Understanding of Gravity

7. A New Understanding of Gravity

8. Precession of Mercury’s Orbit
He actually first tried an offset circle. 8

9. Precession of Mercury’s Orbit
He actually first tried an offset circle.
GR Says time runs more slowly and space is more curved at perihelia 9

10. Now Gravity Can Affect Light

11. Now Gravity Can Affect Light
If you are floating freely, then your worldline is following the straightest possible path through spacetime. If you feel weight, then you are not on the straightest possible path.

12. Newtonian Mechanics Hinted This

13. Gravitational Redshift

14. Gravitational Redshift: Measured in Lab

15. Deflection Depends on Mass

16. Gravitational Lenses

17. Gravitational Lenses

18. Gravitational Lenses!

19. Gravitational Time Dilation
In the initial stationary frame, you & Jackie have watches flashing every 1 sec. Now let the ship accelerate. Your frames are constantly changing. Jackie’s flashes arrive at you more than 1 sec apart, while yours arrive at her less than 1 sec apart.

20. When the Charge Moves: Light!
He actually first tried an offset circle. 20

21. Gravitational Waves!
He actually first tried an offset circle. 21

22. Little Green Men?
LGM-1

23. Pulsars

24. Pulsar Pulses
Can’t explain with other things we know about because the period is too small

25. Pulsar Model

26. Binary Pulsars: Gravitational Waves?
He actually first tried an offset circle. 26

27. Detecting Gravitational Waves
He actually first tried an offset circle. 27

28. LIGO Results!

29. LIGO

30. LIGO Results!

31. LIGO Results!

32. Black Holes

33. Escape Velocity & Schwarzschild Radius

34. Event Horizon

35. Structure of a Non-Rotating BH