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(PhysOrg.com)   Repulsive gravity, previously thought by physicists to only emanate from your mom, may be key to understanding dark matter   (physorg.com) divider line 2
    More: Interesting, gravitational fields, dark matter, dark energy, virtual particles, Antiparticle, cosmological constants, neutrinos, energy density  
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2608 clicks; posted to Geek » on 01 Feb 2012 at 8:49 PM (2 years ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-02-01 10:31:04 PM  
1 votes:

StrangeQ: That's so simple...how has it not been proposed before?


It has, but the real issue is there's no reason to think that matter and antimatter behave differently in regards to gravity. It's fallen into this, "Well, if they did, it would mean a whole bunch of equations work really well," trap. So, sorta like string theory.
2012-02-01 10:15:25 PM  
1 votes:

lisarenee3505: It seems like far too many physicists and cosmologists have come to think about "dark matter" and "dark energy" as real things.


They are real things, for certain values of "real". There is something that has gravitational effects and we can only detect it through those effects- but detect it we do. Whatever this thing is, we call it dark matter.

The expansion of the universe is accelerating. Acceleration requires the application of force over time, which requires energy. Wherever this energy comes from, we call it dark energy.
 
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