Special and General Relativity Forum

Join in expert discussion on special and general relativity discussion. Relativity is the dependence of various physical phenomena on relative motion of the observer and the observed objects.
Replies
5
Views
104
Replies
65
Views
1K
  • Last Post
3
Replies
71
Views
921
  • Last Post
Replies
9
Views
144
  • Last Post
2
Replies
45
Views
768
Replies
37
Views
642
Replies
4
Views
122
Replies
3
Views
101
Replies
41
Views
530
  • Last Post
Replies
17
Views
250
Replies
25
Views
635
  • Last Post
2
Replies
30
Views
498
  • Last Post
Replies
1
Views
115
  • Last Post
Replies
6
Views
182
Replies
5
Views
230
  • Last Post
Replies
3
Views
268
E
Replies
38
Views
835
  • Last Post
Replies
10
Views
423
Replies
31
Views
552
Replies
76
Views
2K
Replies
4
Views
1K
Replies
30
Views
2K
Replies
15
Views
256
Replies
22
Views
478
  • Last Post
Replies
4
Views
171
Replies
4
Views
145
Replies
13
Views
239
Replies
5
Views
134
Replies
14
Views
240
  • Last Post
2
Replies
32
Views
866
Replies
46
Views
1K
  • Last Post
Replies
23
Views
587
Replies
11
Views
402
Replies
16
Views
424
Replies
11
Views
319
  • Last Post
5
Replies
109
Views
2K
  • Last Post
Replies
2
Views
269
Replies
2
Views
194
Replies
9
Views
293
Replies
22
Views
834
Replies
28
Views
726
Replies
43
Views
974
Replies
27
Views
775
  • Last Post
Replies
5
Views
204
  • Last Post
3
Replies
70
Views
2K
Replies
24
Views
524
  • Last Post
Replies
8
Views
436
E
Replies
12
Views
217
  • Last Post
Replies
22
Views
373
Replies
26
Views
611
Replies
3
Views
205
  • Last Post
Replies
11
Views
374
Replies
2
Views
141
Replies
23
Views
549
Replies
8
Views
278
Replies
41
Views
908
Replies
55
Views
2K
  • Last Post
Replies
11
Views
400
Replies
17
Views
396
  • Last Post
Replies
7
Views
298
Replies
24
Views
560
Replies
171
Views
5K
Replies
22
Views
498
Replies
7
Views
508
E
  • Last Post
Replies
17
Views
536
  • Last Post
Replies
2
Views
329
E
  • Last Post
2
Replies
48
Views
5K
Replies
38
Views
1K
  • Last Post
Replies
18
Views
526
  • Last Post
Replies
15
Views
368
Replies
12
Views
311
Replies
13
Views
360
Replies
15
Views
300
Replies
17
Views
619
Replies
8
Views
375
Replies
14
Views
486
Replies
32
Views
908
Replies
13
Views
426
  • Last Post
Replies
5
Views
316

Relativity

General relativity is just describing gravity in a relativistic setting. The equivalence principle hints to the idea that gravity is spacetime curvature.

In special relativity much attention is given to inertial frames, because they are equivalent. However, SR can perfectly handle other frames like accelerating ones, just as in Galilean relativity (classical mechanics) you can describe accelerating observers.

The key difference between classical mechanics and relativity is that, while in classical mechanics only linearly accelerating observers can locally pretend they are in a gravitational field, in GR every observer can locally pretend he/she is in a gravitational field. The class of "equivalent observers" is thereby enhanced.
Top