Big bang cycles

The universe will not recolapse.Recent data strongly suggests that the univere is accellerating its expansion. This means that, not only will the universe never experience a "big crunch" but also, that it will experence a "big chill." As space expands faster and faster, distant galaxys will eventualy disapear as they leave our hubble volume, since they will be traveling away from us faster than the speed of light. More and more galaxys will disapear beyond the horizon of our hubble volume until eventualy, in the distant future, our decendants will only be able to see the stars in our own galaxy and those in the andromida galaxy.There is, however, a possiblity that big bang cycles occor when our brane collides with another paralell brane. Such parallel branes could be deteced if some assumptions about string theory are correct. If string theory is right about gravity being able to leave our brane (one possible reason why it's the weakest force) we might eventualy be able to detect faint gravity waves from paralell branes in places where there is no strong gravitational field in our own universe.As to the question of the inital matter being a singularity that is incapable of expansion, see my thread on inflationary cosmology.

Your mixing up your sources. Yes I saw that Nova program on time travel, and yes you would need to convert the mass of Jupeter into a form of exotic energy to open up a wormhole to the size of a METER.What you need to expand an inital clump of matter (even one that weighs only 20 lbs)is and Inflaton (not inflation) feild. again see my thread on inflationary cosmology if you want more info.

Though any journey to a black hole would be a one way trip (anything would be destroyed even before it even reached the event horizon) there are other ways to make a worm hole.Below the plank scale space-time gets all choppy and chaotic. John Wheeler for whom, this choppy foamy nature of space at the plank scale is named after, ("Wheeler foam) decribes space as an ocean. From far above the ocean looks flat but as you get closer and closer to the surface it starts to look choppy and wavy.Once you decend below the plank scale, space can warp and shift and do all sorts of weird things, one kind of weird thing it can do is create a worm hole. These worm holes exsist for such a breif period of time that they might as well not exsist (nothing could make it through them) but if we could capture a wormhole and fill it with a form of exotic matter (Something that exserts negative pressure) we could theoreticaly have a stable wormhole.String theory predicts that time can, in fact, tear. Though Einstien would have said that the idea of space "tearing" was taking the analogy of it as fabric too far, string theory predicts that space tears and reforms, and that wormholes do indeed exsist.Whether or not these wormholes are, or will ever be, usable is another story.

Welcome to the forum.

Click on the "reply" icon when you respond so that we can know when you have posted a responce.Well, as for this exotic matter that can exert negative pressure it has been shown to exsist experamentaly. It could acount for the missing "dark energy" in the universeAs for dark matter there is mounting evedence that it too exsists. And it isn't just a place holder, other theories point to its exsistance as well. I know that we have some observations that reveal it's presence. Perhaps some other cosmology buffs could provide a link?

Well, first of all, we have found black holes with X-ray telescopes.We know the gravitational tidal forces of a black hole would completley destroy anything that got anywhere near it. Hell, we couldn't even land a probe on a nutron star, let alone a black hole.

It's interesting that you bring up information: Keep in mind, the event horizon is a region of space where gravity is so intence that the escape velocity (the speed somthing needs to be moving to escape) is greater than the speed of light. Nothing could escape once it passed that point of no return.However! As black holes slowly dissolve they do reemit matter in the form of radiation. This is why you may have heard the expression "black holes are realy gray."The physiscs of how they do this are tricky but I think it has something to do with random particles and antiparticles appearing on the border of the event horizon: One of the particles is lost while the other escapes.Check out this recent news for more on the "information" that enters a black hole:News articles and features | New Scientist So the matter from a probe or anything else that enters a black hole will eventualy be reemitted in the form of radiation as the black hole disintrates over billions of years.It is true that anything that enters a black hole will be hopelessly streach and obliterated (so there is no hope of a probe reemerging whole from inside a black hole). And it is also true that the energy/matter that falls into a black hole will be reemitted as radation.So are black holes portals to other univereses? I would say, catagoricly no.Do black holes emit "information" as they decay? (keep in mind physisists are using information in a very specific sense here) The anwswe is... sorta.

Yup, too bad.In one of my favorite jokes from "Futurerama", Benders girlfriend falls into a black hole.Fry tries to console Bender by telling him that she "may still be alive in some paralell universe." The professor agrees "Oh yes it's possible" but then whispers to his companion "not a chance."This message has been edited by The Dread Dormammu, 12-08-2004 05:00 AM

Did you check out the link I posted. I said "sorta" because the article I read said that it was mangled and unusable.What's this new development you spaek of?