Time Dimension To Become Space-like 587
KentuckyFC writes "The Universe is about to flip from having three dimensions of space and one of time to having four dimensions of space. That's the conclusion of a group of Spanish astrophysicists who have calculated that observers inside such a Universe would see it expanding and accelerating away from them just before the flip (abstract, full paper pdf on the physics arXiv). 'We show that regular changes of signature on brane-worlds in AdS bulks may account for some types of the recently fashionable sudden singularities. Therefore, the fact that the Universe seems to approach a future sudden singularity at an accelerated rate of expansion might simply be an indication that our braneworld is about to change from Lorentzian to Euclidean signature. Both the brane and the bulk remain fully regular everywhere.'" Update: 10/09 16:06 GMT by Z : A few readers have written in to point out that the article is not peer-reviewed; your mileage may vary.
Re:So how does this affect us? (Score:5, Informative)
I believe that's The Boy Who Reversed Himself [amazon.com]. I remember having read that when I was in highschool.
Old, old old news (Score:2, Informative)
Relativity talks of space and time as a single 4-dimensional 'spacetime'.
M-Theory, Superstrings, p-Branes, and a billion other theories all say there are 10 (or 11) dimensions, including things like two-dimensional "time" and "imaginary-time" dimensions, smaller "curled-up" spacial dimensions, etc.
Comment removed (Score:5, Informative)
M-Theory is bad science (Score:1, Informative)
Not only that, it is based on M-Theory [wikipedia.org] (is that still what they are calling it these days?). M-Theory was the brain child of a bunch of mathematicians; an attempt at building a model that could resolve the conflicts between general relativity [wikipedia.org] and quantum mechanics [wikipedia.org].
The equations that they produced seem to resolve those conflicts, but do so by proposing the existence of a whole host of previously unobserved (and currently unobservable) entities. Good arguments can be made that this violates the principle of Ockham's Razor [wikipedia.org]. Either way, the bottom line is that the evidence just isn't there.
So far, M-Theory is not really a Theory, but rather an untested hypothesis. Once the evidence rolls in I will change my tune, but until then I consider it to be little more than idle speculation.
Nothing but quaternions (Score:2, Informative)
doug
barking up a real 4D tree by himself
instead of making dumb 11D claims
Re:Time speeding up (Score:5, Informative)
One suggestion was that two branes within the bulk colided, and all that energy that has to go somewhere goes into a big bang in a 4d brane (the bulk is either 10 or lately 11 dinentions while we are just in 4)
If those theories are correct, both time and space existed before the big bang, and also at some point in the future our brane will collide with another again and cause another big bang. This happens through out all the branes at different times and repeats forever.
Note that I word my post as if "this is", when it should be pointed out that my wording is this way "if these theories are right", so please take it as such.
Re:Mayan Calender (Score:3, Informative)
Does that help?
Re:Time speeding up (Score:3, Informative)