Science a Go Go has a really good article(broken up into Part I and Part II) about physicist Peter Lynds' new paper on the idea of a cyclic universe. Well, not quite a cyclic universe as has been discussed by many previous models in which the universe continually expands in the Big Bang and then contracts to a singularity, but a model in which time has no relevance, and rather than ending in a singularity which then explodes back out in the Big Bang, there's a reversal of time in which the second law of thermodynamics isn't violated.
It is this reasoning that has given rise to Lynds' conclusion that no singularity can ever be reached, as events would be reversed before the second law could be breached. The implication of this, if you haven't already guessed, is that the reversing of events at the first available opportunity would represent the big bang, with the added implication that this process not only leads the universe toward the big bang, but also causes it. Following from this, he says, is the expansion and development of a universe identical in every way to the last one. But even more important, according to Lynds, is the realization that what we are really saying is that the big crunch caused the big bang, as well as being equally true to say that the big bang caused the big crunch. Voila! Our contrived notions of past and present become redundant. "One is now faced with a universe that has neither a beginning nor end in time," contends Lynds, "but yet is also finite and needs no beginning. The finite versus infinite universe paradox of Kant completely disappears." Lynds model also shows that time travel is not possible.
Confused yet? Well, honestly, if philosophical/scientific discussions on the beginning of the universe and where we go from here is your thing, then this is a great article. If it's not, well, move on down the page to the rest of my posts today. This article is certainly not too complicated to understand, but it is a little bit complicated at times.
Labels: cyclic universe, Peter Lynds, philosophy, science















