Antimatter

[ydoaPs]

I have always been told that there is mostly matter in the universe(compared to antimatter). How does anyone know? They say if there was, there would be buffer zones. I thought there are rediculous distances betwenn heavenly bodies, so why couldn't there be antimatter galaxies?

[Aeschylus]

There is a thoey of galaxies and antigalaxies, but the problem is that there is no way to prevnt the matter from galaxies and antigalxies meeting; there would always be a zone between galaxy and an adjacent antigalaxy where matter from the two would meet and anihilate leading to the emisson of gamma rays in huge quantities. No such zones are observed between galaxies.

[ydoaPs]

aren't galaxies VERY VERY VERY VERY far apart?

[Aeschylus]

Yes, but the matter coming from them, in the form of stellar winds for example will meet.

[ydoaPs]

stellar winds going to other galaxies? you may be overestimating solar wind

[Aeschylus]

stellar winds going to other galaxies? you may be overestimating solar wind

 

Lets just say that the model has alreadybeen proposed an analysed in some detail.

[ydoaPs]

proof, i want proof!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

linky?

[Aeschylus]

http://www.sciencemag.org/cgi/content/full/278/5336/226

[unknow force]

an question about anti-matter, why the high gamma rays turns in particles, and why is anti-matter (positrons), theres any relation with the super-string theory??, theres any frecuency that limit the ondular-particle nature of the energy-mass????

[unknow force]

also that onde-particle turn electro-magnetic energy into gravitatory energy???

[ydoaPs]

1) I have no clue what you are trying to say.

2) string theory= look it up omg, i am tired of these "is it related to string theory" questions.

[alt_f13]

Be patient, this force are unknow to some person (positrons)????

[Sayonara]

aren't galaxies VERY VERY VERY VERY far apart?

Not all of them, no. Especially not the ones that are colliding.

[Thales]

yourdadonapogos, the void between galaxies still has matter in it, not much but some. If there were antimatter zones in the universe then there would be boundaries where the zones 'met' normal matter and thus, annilated the matter generating lots of energy. While the idea is not impossible it is highly improbable, as in our extensive surveying of the universe we have not found any of areas generating this energy seemingly from no where.

 

There is also the notion that the universe was once much much smaller and an abundance of antimatter wouldn't have left much for us to observe today(or enough to create us to observe this fact).

[ydoaPs]

background radiation???????????????

[Thales]

Background radiation is too uniform to be a result of matter/antimatter collisions. It is also too cold (a mere 2.7K) and at the wrong wavelength (microwaves) to be explained via this process.

 

The source of the background radiation is the afterglow of the big bang. We can say this with a fair degree of confidence because its temperature/distribution/wavelength match well with other estimations of the age/size of the universe.

[Severian]

It is a good question, and one which I think is being too quickly dismissed here.

 

There is a nice review on this here.

[ydoaPs]

Background radiation is too uniform to be a result of matter/antimatter collisions. It is also too cold (a mere 2.7K) and at the wrong wavelength (microwaves) to be explained via this process.

 

The source of the background radiation is the afterglow of the big bang. We can say this with a fair degree of confidence because its temperature/distribution/wavelength match well with other estimations of the age/size of the universe.

 

 

how COULD it be? logic would dictate it is impossible. energy travels at c, matter deosn't. i have never understood why people thought that it is from big bang.

[Cap'n Refsmmat]

It's not matter anyways. It's radiation. Radiation is energy.

[ydoaPs]

that is what i am saying. it would have passed us LONG ago.

[Cap'n Refsmmat]

Err no. The universe is billions and billions of light years across. That radiation will still be passing us, especially since the universe is still expanding.

[ydoaPs]

then how the bloody hell did we get in front of it???????????????

 

radiation was created before matter. radiation travels faster than matter. we should not be able to see radiation from the big bang.

[Cap'n Refsmmat]

Perhaps it's been zipping around space bouncing off of things before it finally hit us.

[Aeschylus]

then how the bloody hell did we get in front of it???????????????

 

radiation was created before matter. radiation travels faster than matter. we should not be able to see radiation from the big bang.

 

For a global event such as recombination (which is where the radiation comes from 300,000yrs after the BB), we should always be able to see the radiation. The radiation is far too homogenous to come from the anihilation of matter and antimatter and it is alos of the wrong wavelngh.

[ydoaPs]

if it started before us and is faster than us, how hasn't it passed seconds after the big bang. actually, it should have passed before matter was even created.