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
12
Views
81
Replies
15
Views
387
Replies
25
Views
341
  • Last Post
Replies
13
Views
181
Replies
7
Views
157
Replies
42
Views
721
  • Last Post
5
Replies
103
Views
2K
  • Last Post
Replies
12
Views
165
  • Last Post
Replies
3
Views
110
Replies
20
Views
203
Replies
23
Views
316
Replies
18
Views
297
Replies
15
Views
119
Replies
13
Views
249
  • Last Post
2
Replies
43
Views
713
  • Last Post
Replies
19
Views
218
Replies
13
Views
242
  • Last Post
Replies
10
Views
227
Replies
84
Views
2K
Replies
21
Views
397
Replies
27
Views
548
Replies
2
Views
198
  • Last Post
Replies
16
Views
240
Replies
8
Views
202
Replies
27
Views
569
Replies
69
Views
860
Replies
4
Views
230
Replies
13
Views
380
Replies
13
Views
347
Replies
24
Views
425
  • Last Post
Replies
1
Views
254
  • Last Post
4
Replies
90
Views
1K
Replies
20
Views
332
  • Last Post
Replies
17
Views
873
  • Last Post
Replies
15
Views
417
  • Last Post
Replies
2
Views
273
Replies
13
Views
475
Replies
4
Views
337
Replies
14
Views
398
Replies
11
Views
1K
Replies
25
Views
957
Replies
15
Views
474
Replies
4
Views
343
Replies
5
Views
282
Replies
1
Views
368
Replies
14
Views
1K
Replies
21
Views
548
Replies
10
Views
329
  • Last Post
2
Replies
29
Views
723
Replies
13
Views
582
Replies
31
Views
633
  • Last Post
Replies
4
Views
276
Replies
23
Views
466
  • Last Post
Replies
21
Views
452
  • Last Post
Replies
14
Views
538
Replies
21
Views
489
Replies
4
Views
366
Replies
22
Views
779
Replies
9
Views
400
Replies
101
Views
3K
  • Last Post
Replies
20
Views
445
Replies
12
Views
474
Replies
4
Views
347
  • Last Post
Replies
1
Views
296
  • Last Post
2
Replies
39
Views
891
  • Last Post
2
Replies
35
Views
2K
Replies
15
Views
699
  • Last Post
Replies
11
Views
596
  • Last Post
Replies
5
Views
577
Replies
14
Views
511
  • Last Post
Replies
16
Views
436
Replies
18
Views
776
  • Last Post
Replies
13
Views
485
Replies
15
Views
448
Replies
98
Views
3K
Replies
3
Views
404
Replies
14
Views
500
  • Last Post
Replies
1
Views
311
Replies
13
Views
460
Replies
4
Views
313
Replies
15
Views
369
  • Last Post
3
Replies
53
Views
2K
  • Last Post
2
Replies
41
Views
927
Replies
34
Views
1K
  • Last Post
Replies
4
Views
596
Replies
21
Views
620
Replies
11
Views
439
  • Last Post
Replies
2
Views
446
Replies
17
Views
665

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