PDA

View Full Version : Big Bounce and Inflation



Strange
2010-Oct-14, 12:54 PM
Those crazy Loop Quantum Cosmology guys reckon that a "big bounce" would inevitably lead to the sort of inflation seen after the big bang:
http://dx.doi.org/10.1016/j.physletb.2010.09.058

And New Scientist's story on it:
http://www.newscientist.com/article/mg20827825.200-big-bounce-cosmos-makes-inflation-a-sure-thing.html

Cougar
2010-Oct-14, 02:12 PM
Those crazy Loop Quantum Cosmology guys reckon that a "big bounce" would inevitably lead to the sort of inflation seen after the big bang...

Here's a free copy of the paper (http://arxiv.org/abs/0912.4093). A lot of it is over my head, but they are apparently saying that a bounce would solve the dead-end singularity problem with general relativity, AND the highly improbable initial condition problem of standard cosmology, because they tried a wide variety of parameters in such a scenario, and they all produced a suitable inflationary period such that our universe could result therefrom.

I guess the thinking is similar to inflation itself: IF there was inflation, then these [certain] problems are explained :: IF there was a bounce, then these [other certain] problems are explained.

caveman1917
2010-Oct-16, 12:59 AM
I guess the thinking is similar to inflation itself: IF there was inflation, then these [certain] problems are explained :: IF there was a bounce, then these [other certain] problems are explained.

But the nice thing is that LQG already predicts the bounce, it is not postulated just to explain inflation - this is an added benefit (and a strong one i suppose), not a new hypothesis.