Special Relativity is only for constant speeds

  • #1
926
56
I'm reading the online version of a book that says
SRT is only valid if observers move at fixed velocities with respect to each other. To handle observers whose relative velocities may vary requires the more general but also more complex GRT
Rindler observer comes right into my mind when I read this. So I think the book is wrong. What do you all think?

On a second guess, perhaps the author takes the view that SR is only for constant speeds in the same sense that one could say that Newtonian mechanics is only for inertial frames, in that only in inertial frames Newton's law works.

If that is the case, then the part I quoted above is not wrong.
 

Answers and Replies

  • #2
29,938
6,323
Acceleration is fine. SR cannot handle tidal gravity.
 
  • Like
Likes kent davidge
  • #3
PeterDonis
Mentor
Insights Author
2019 Award
30,617
9,654
I'm reading the online version of a book
What book?

I think the book is wrong.
You think correctly.

perhaps the author takes the view that SR is only for constant speeds in the same sense that one could say that Newtonian mechanics is only for inertial frames, in that only in inertial frames Newton's law works
Newton's laws work fine in non-inertial frames; you just have to add fictitious forces.
 
  • Like
Likes kent davidge
  • #5
PeterDonis
Mentor
Insights Author
2019 Award
30,617
9,654
As noted, SR can handle non-inertial observers and non-inertial frames. It is limited only by the requirement that spacetime must be flat.

Thread will remain closed.
 
  • Like
Likes vanhees71

Related Threads on Special Relativity is only for constant speeds

Replies
8
Views
3K
Replies
24
Views
2K
Replies
13
Views
3K
  • Last Post
Replies
14
Views
3K
Replies
10
Views
367
Replies
1
Views
2K
Replies
1
Views
839
Replies
14
Views
1K
Replies
11
Views
4K
  • Last Post
Replies
8
Views
1K
Top