- #1

- 199

- 22

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- I
- Thread starter sunrah
- Start date

- #1

- 199

- 22

- #2

Nugatory

Mentor

- 13,686

- 6,968

Special relativity applies only locally because special relativity is exact only for a flat spacetime, and spacetime is not globally flat. Thus, we can only use special relativity across regions of spacetime that are small enough that the curvature and gravitational effects are negligible.

- #3

- 199

- 22

- #4

Boing3000

Gold Member

- 332

- 37

What I have read from Nugatory in post #2 is that SR is not a large scale theory. So how could it be invalidated on scales it is not working in ?invalidate SR on large scales.?

- #5

- 199

- 22

- #6

Boing3000

Gold Member

- 332

- 37

- #7

- 6,723

- 426

I thought that spacetime was flat and with no discernible non-trivial topology.

You're probably thinking of the average spatial curvature on cosmological scales. That's different from the spacetime curvature, which is definitely nonzero. GR describes gravity as curvature, so if there were no spacetime curvature, there would be no gravity in the universe.

- #8

jedishrfu

Mentor

- 13,291

- 7,196

Share:

- Replies
- 3

- Views
- 2K