Antimatter Galaxies .. (?)
1 Apr 2005 21:12:40 UTC
Topic 188840
(moderation:
A central assumption of cosmology is that the Universe is homogeneous on the large scale, but what if this were not the case. If for example, seperated bt sufficient distance as not to physically interact, some galaxies were made of antimatter, would we be able to tell?
Antimatter Galaxies .. (?)
)
it is a mistery to me why in universe we have assimetry in matter - antimatter distribution
> it is a mistery to me why
)
> it is a mistery to me why in universe we have assimetry in matter - antimatter
> distribution
>
You may have look at this article:
http://www.sciencedaily.com/releases/2004/08/040803094110.htm
Es gr
> A central assumption of
)
> A central assumption of cosmology is that the Universe is homogeneous on the
> large scale, but what if this were not the case. If for example, seperated bt
> sufficient distance as not to physically interact, some galaxies were made of
> antimatter, would we be able to tell?
No. All the things we can detect on earth about the antimatter galaxy, like its light, are the same as for a galaxy of matter. Its gravitational interaction with other galaxies is the same, too.
I always thought when a
)
I always thought when a particle and it's anti-particle collided, they annihilated each other.
> > it is a mistery to me why in universe we have assimetry in matter -
> antimatter
> > distribution
> >
> You may have look at this article:
> http://www.sciencedaily.com/releases/2004/08/040803094110.htm
>
>
>
- Marco
Team Canada
> it is a mistery to me why
)
> it is a mistery to me why in universe we have assimetry in matter - antimatter
> distribution
>
Well, Neutrons and Protons are made of a complementary number of up/down quarks, so if a big bang created an even number of up and down quarks, the creation of neutrons and protons makes sense.
Electrons are negatively charged, so they like to hang around protons.
Positrons, the anti electrons, are positively charged, so they would be repelled by the protons in regular matter.
I think you need a rubik's cube to figure out the whole quark thing.
http://hyperphysics.phy-astr.gsu.edu/hbase/particles/quark.html
> I always thought when a
)
> I always thought when a particle and it's anti-particle collided, they
> annihilated each other
Yes, they do.
When matter and anti-matter collides, they have enery from their mass (e=mc^2)plus mass from their momentum. This enery is set free. From this free enery new particles are formed. This is what happens in the colliders like this one at CERN.
The new particles ( matter and anti-matter)have a different life span. After this they decay into more particles. Since there is a asymmetrie how they decay, more matter than anti-matter is left over.
This is what the article describes.
http://www.sciencedaily.com/releases/2004/08/040803094110.htm
You may also look at this link:
http://www.science-park.info/particle/unsolve.html
or google for: CP violation
Es gr