General Relativity: The Demise Of Newtonian Gravity Flashcards
1
Q
How did Newtonian gravity fail
A
Experiment - mercury’s orbit
Theory - violates speed of light limit
2
Q
What is general relativity
A
Gravity as curved Spacetime
3
Q
Gravitational lensing
A
Spacetime is curved so much you can see multiple copies of the sky squeezed into narrower rings
Shift + compression radially
Stretching in angular direction
4
Q
Precession of perihelion of mercury
A
With only time warp you get Newton gravity
With time and space warp you get it right
5
Q
Black holes - mysteries
A
Astrophysical mysteries - accretion disks - magnetic fields/jet - formation/evolution Theoretical mysteries: - origin of black hole entropy - information loss paradox - nature of singularity
6
Q
When do you have to use GR
A
When 2GM/(c^2R) -> 1
Extremely compact objects and cosmology
7
Q
Time dilation
A
Sqrt[(1-x)/1-Y)]
Go from there
8
Q
Finding theta N
A
1) a = GM/b^2, a = acceleration
2) vy = at, t=d/v
3) vx = v
4) theta ~ vy/vx
