In General Relativity, (non local) speeds greater than the speed of light

Space/Science » in reply to Or it might be just gas pressure pushing everything apart

In General Relativity, (non local) speeds greater than the speed of light

David F Mayer — 5/2/2006 7:43:35 PM (archived)

are possible. In fact, there is no speed limit whatosever. Only local phenomena (those happening in a local Lorentz frame) are limited to the speed of light. If two areas of the Universe are moving apart at greater than the speed of light, then they can not be causally connected.

The whole thread (35 posts)

Dark Energy: Recent Developments - ljk - 5/2/2006 2:29:18 PM
- Or it might be just gas pressure pushing everything apart - SDF - 5/2/2006 4:12:19 PM
  - Wasn't me! (n/t) - Tom Brosz - 5/3/2006 5:02:11 AM
  - PLEASE tell me that was tounge in cheek.... (n/t) - R.L. - 5/3/2006 3:16:50 AM
    - You spelled "tongue" incorrectly (n/t) - SDF - 5/3/2006 4:01:36 AM
      - Yup, so I did... - R.L. - 5/3/2006 8:00:47 PM
  - Yeah, and air pressure is holding the Empire State Buliding up.... - et - 5/2/2006 9:09:07 PM
    - I still think the universe has been let off it's leash. - RobVG - 5/6/2006 6:21:06 PM
    - Radiation pressure then - SDF - 5/3/2006 1:12:05 AM
      - Oh, trust me. They didn't forget that either. - et - 5/3/2006 8:32:39 PM
        
        Nested black holes - SDF - 5/4/2006 3:02:15 AM
        
        or maybe..... - SDF - 5/4/2006 4:48:56 AM
  - In General Relativity, (non local) speeds greater than the speed of light - David F Mayer - 5/2/2006 7:43:35 PM
  - re: Or it might be just gas pressure pushing everything apart - ljk - 5/2/2006 6:05:54 PM
    - Does the Horsehead Nebula qualify as dark matter? - SDF - 5/3/2006 1:59:10 AM
      - No... - SteveS - 5/3/2006 1:13:05 PM
        
        That doesn't really answer my question, I'll clarify - SDF - 5/3/2006 1:24:52 PM
        
        re: That doesn't really answer my question, I'll clarify - Marcia - 5/4/2006 1:12:51 AM
        
        It MIGHT 'baryonic dark matter' - R.L. - 5/3/2006 9:31:27 PM
        
        re: It MIGHT 'baryonic dark matter' - Marcia - 5/5/2006 4:42:34 PM
        
        That should read: " It MIGHT be called 'baryonic dark matter' " (n/t) - R.L. - 5/3/2006 9:32:39 PM
        
        The difference - SteveS - 5/3/2006 8:14:58 PM
        
        re: This one shows better... - SteveS - 5/3/2006 9:28:26 PM
        
        I see dark matter - SDF - 5/4/2006 2:58:59 AM
        
        re: I see dark matter - SteveS - 5/4/2006 1:28:02 PM
        
        The nebula is made of matter is it not? If it is a dark nebula, then it is dark matter! (n/t) - SDF - 5/4/2006 3:39:00 PM
        
        Ohhh...I get it... - SteveS - 5/4/2006 6:16:03 PM
        
        I'm not yanking your chain. Check out these images. - SDF - 5/5/2006 5:23:53 AM
        
        Detection of the ISW effect and corresponding dark energy constraints - LJK - 5/5/2006 8:30:12 PM
        
        Cosmological Acceleration: Dark Energy or Modified Gravity? - ljk - 5/9/2006 8:25:08 PM
      - astro satire - phil - 5/3/2006 12:37:38 PM
        
        If it pays more..... I'm in! (n/t) - SDF - 5/3/2006 2:58:31 PM
        
        Lambda Cold Dark Matter (LCDM) model of galaxy formation and evolution - ljk - 5/10/2006 3:15:26 PM
        
        Inflation, dark matter and dark energy in the string landscape - ljk - 5/10/2006 3:17:51 PM
        
        Constraints on Sterile Neutrino Dark Matter - LJK - 5/12/2006 5:03:52 PM

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