The big crunch

[that_guy]

I've searched for a thread relating to the big crunch but couldn't find one, (either because it doesn't exist or I am a terrible searcher.) so I decided to make a thread regarding the theory of big crunch. The event when the universe expands to the point of collapsing itself.

Personally from my current knowledge the theory itself contradicts the fact that fermions can not be created and thus has to be same as before. This shows that however "larger the universe gets, it will simply not have enough mass (so to speak) to collapse in its own gravity. (please correct me if i'm wrong). There's one thing that's been itching inside my head... Does the universe have its own gravity?? Since we don't know what's outside the universe, how would we know whether the universe itself would have gravity that can affect it self and whatever lurks outside of it. I personally think that after the energy from the big bang wears off, the universe will just simply stop expanding and continue to exist.

thanks,
Tony

[sebastien]

Hello again :)
To tell you the truth I have never heard of the Big Crunch Theory(maybe because of the fact that I am still very young) but it sounds like a very interesting theory, and I must look it up!!!

Fermions-are they not just atoms with a spin of half an integer??

Also, we can only assume that space is infinite, and therefore because of the expanding universe (Hubble's Law) there must be further into space heavy, galactic bodies, and therefore it would have gravity because of the heavy bodies, warping spacetime. Therefore, there must be gravity to answer your question on the gravity. The Universe, if it does have gravity, that would mean that the Universe is part of a bigger thing, or as quantum mechanic states, that it is 11-D. Meaning that their are parallel universes' to us, meaning that the Universe most highly probably DOES have its own gravity.

Regards
Sebastien.

[that_guy]

Fermions are particles that we're used to think as particles and now are more like wavicles like quarks and electrons. Wavicles being waves and particles.. quarks meaning up and down not op,bottom, strange, and charm.

And great explanation on the gravity thingy. Answered my questions. I'm really young compared to the people in this forum just like sbastien (no pun intended). So, forgive me if i make mistakes.

[sebastien]

Thats odd, i always thought fermions were particles with half-integer spin, eg:1 1/2 etc..
and Bosons to be particles with integer spins eg. 1,2 etc... By the way how old are you???

Cheers
Sebastien

[that_guy]

http://nonlocal.com/hbar/bosonfermion.htmlGot this off the web now so i'll have a read as well to see if ive confused it with something else. As far as I know fermions are leptons or quarks that makes up mass, while bosons are like photons. which are considered massless

P.S. I edited the previous post of mine in the thread to show my age.

[sebastien]

Thanks a lot! And i saw as soon as i checked the other tread I was like "oh, should of checked it before:)" If I see anything I'll tell you immediatly :)

Sebastien.

[that_guy]

according to the web we're both right! funny that cause i was really questioning my knowledge.

[sebastien]

Hahaha yea, same here, I was beginning to get puzzled on that one :)

[that_guy]

whoops... said questing instead of questioning... fixed now thou... just posting to make sure that nobody gets confused.