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ct-
A
C
Ba
x-
a
-a
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ct
x
A
B
C
ct-
x-
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dy
dx
cdtPath of massive particle
(timelike)Future
Elsewhere
Past
ict
x
x
ict
i
i
-
-
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Frame O
Frame O
xxA B
- -
-
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U
x
ct
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u 1 u 2
U
Before
After
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Q P11
Q
P2
2
Before After
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A
p~
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U
x
ct
=( ct,x,y,x)
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4
1
x
ya
a
2
3
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m
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x
t
tb
tt
Bottom Top
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Before After
Splat
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mg
g
mg
g
1 2
3 4
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g
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t
xh
AB
t 0
t 0 + t
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g
g
1 2
3 4
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U
VTimelike curve
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B
A
C
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A
B
C
D
e
e2
1^
^
x2=b
x1=a+ a
x2=b + b
x1=a
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A
a
V
V
/
/
A
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FLAT
SPACETIME
SPECIAL RELATIVITY
Minkowski Coordinates
A Non - Inertial Frame
frame or
= 0 , R
= 0
Metric is
=/= 0
But R
= 0
are inertial forces
so still flat spacetime
GENERAL RELATIVITY
CURVED
SPACETIME
General Coordinates
Metric is g
=/= 0 , R
=/= 0
A Local Inertial Frame
Metric is + ( x ) 2
= 0 , R
=/= 0
freely falling
=/= 0 , R
=/= 0
Transform to an accelerating
choose some
coordinates.generalized
Transform to
Minkowski
a non-rotating
frame and take
coordinates.
Transform to
frame wrt free fall.
an accelerating
mass/energy
Equivalence Principle
- gravity also an inertial force
Add
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Light ray
x
P
O
o
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Star
Sun
Observer
Aparent star
1 2
br
Quasar Galaxy EarthD d
b=+/2
/2
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