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
41
Views
4K
  • Sticky
  • Last Post
Replies
2
Views
56K
  • Sticky
  • Last Post
Replies
4
Views
14K
  • Last Post
2
Replies
32
Views
252
Replies
19
Views
317
Replies
20
Views
339
Replies
3
Views
77
  • Last Post
Replies
18
Views
709
  • Last Post
11
Replies
263
Views
5K
Replies
17
Views
226
Replies
22
Views
406
  • Last Post
3
Replies
60
Views
670
Replies
5
Views
129
Replies
21
Views
519
Replies
2
Views
157
Replies
36
Views
483
Replies
13
Views
370
Replies
31
Views
453
Replies
9
Views
206
Replies
76
Views
2K
Replies
16
Views
218
Replies
4
Views
963
Replies
11
Views
284
Replies
30
Views
2K
  • Last Post
7
Replies
155
Views
1K
Replies
35
Views
841
Replies
231
Views
12K
Replies
1
Views
111
Replies
33
Views
723
Replies
15
Views
190
  • Last Post
Replies
7
Views
132
Replies
60
Views
1K
Replies
1
Views
75
  • Last Post
2
Replies
46
Views
1K
Replies
22
Views
434
  • Last Post
Replies
4
Views
141
Replies
4
Views
110
Replies
17
Views
318
Replies
16
Views
253
Replies
13
Views
191
Replies
5
Views
109
Replies
14
Views
195
  • Last Post
Replies
7
Views
368
Replies
12
Views
341
Replies
16
Views
608
  • Last Post
2
Replies
32
Views
792
Replies
3
Views
365
Replies
16
Views
268
Replies
14
Views
495
Replies
10
Views
250
  • Last Post
Replies
4
Views
193
Replies
46
Views
1K
  • Last Post
5
Replies
108
Views
1K
  • Last Post
Replies
23
Views
529
Replies
2
Views
118
Replies
11
Views
356
Replies
12
Views
277
Replies
16
Views
380
Replies
4
Views
184
Replies
63
Views
1K
  • Last Post
Replies
7
Views
192
Replies
11
Views
289
Replies
7
Views
149
  • Last Post
Replies
6
Views
197
Replies
15
Views
317
Replies
11
Views
308
  • Last Post
5
Replies
109
Views
2K
Replies
13
Views
318
  • Last Post
Replies
5
Views
244
  • Last Post
Replies
3
Views
146
  • Last Post
Replies
2
Views
237
Replies
67
Views
1K
Replies
2
Views
166
Replies
6
Views
236
Replies
9
Views
271
  • Last Post
Replies
22
Views
302
Replies
22
Views
779
Replies
41
Views
781
  • Last Post
Replies
8
Views
310
  • Last Post
Replies
9
Views
177
  • Last Post
Replies
0
Views
761
Replies
28
Views
655
  • Last Post
Replies
1
Views
128

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