Oct
23
2008

New Theory On the Block: The Big Bounce

The Big Bounce: The big bang may not have been the beginning of the universe, but merely the beginning of one of an infinite series of universes. Yeah, wrap your mind around that!Courtesy Pat Rawlings/SAICThe Big Bang and the new kid - the Big Bounce - are facing off and it looks as if the Big Bounce is pulling ahead in the polls. Big bounce theory, proposed by Martin Bojowald, is based on loop quantum gravity. And what, you may ask, is loop quantum gravity??
Well, since you asked so nicely...loop quantum gravity - or loop gravity - is a theory of spacetime that attempts to reconcile quantum mechanics and general relativity, according to Wikipedia. Basically, loop gravity tries to prove that gravity is quantized (or broken down into discrete steps). Read more here.
So now that you know a little bit about loop gravity, we can move on to the theory at hand. The big bounce says that the universe is like a bouncy ball. When the ball hits the ground, the universe is at its smallest; as the ball rises above the ground, the universe expands; as the ball moves back towards the ground, the universe begins to implode; when the ball starts to rise after hitting the ground, the universe expands again... You get the idea.
Where the big bounce differs from the big bang is that it resolves the issue of the big bang singularity. And again, you may ask, what in the world is the big bang singularity? Well, for those of you not in the know: the big bang singularity is the single point from which the entire universe is supposed to have sprung. It is, in fact, the major sticking point in the big bang theory; the calculations just can't account for such a singularity.

"Without any evidence associated with the earliest instant of the expansion, the Big Bang theory cannot and does not provide any explanation for such an initial condition." - Big Bang Wikipedia page

So for years, this singularity has been an assumption inherent in the theory. And you know what the problem with assuming is...
This is where the big bounce starts to look mighty good! The big bounce suggests that, as the universe implodes, the energy density of space increases to a point that gravity ceases to be attractive and repulses instead. When gravity becomes repulsive, the universe stops shrinking and begins to expand. Once the density moderates, gravity switches back to being attractive. This explains the explosive expansion seen and accounted for in the big bang theory.Big Bounce: The universe implodes until gravity becomes repulsive and a new universe explodes from the ashes, so to speak.Courtesy Relativity 4 Engineers
Now here is where the big bounce gets really cool! The idea that the universe implodes and explodes like a ball bouncing leads Bojowald to believe that there have been an infinite number of universes before ours and an infinite number of universes to come. Each universe expands, increasing in inertia (or disorder) until it implodes, thus clearing the slate for the new universe.

“If order has been decreasing for an infinite span of time, the universe should by now be so disorganized that structures we see in galaxies as well as on Earth would be all but impossible. The right amount of cosmic forgetfulness may come to the rescue by presenting the young, growing universe with a clean slate irrespective of all the mess that may have built up before.” - Bojowald, Scientific American

No slate can be completely cleared, so Bojowald is now focusing on trying to learn about the universe that came before ours by studying gravitational waves and neutrinos.
To get the full story check out Bojowald’s article in the October issue of Scientific American.
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Your Comments, Thoughts, Questions, Ideas

ARTiFactor's picture
ARTiFactor says:

Here is the link to Bojowald's article.

posted on Thu, 10/23/2008 - 7:13pm
Teague's picture
Teague says:

so this could mean that new universes could arise from black hole singulartities because basically it is the same thing space and time come to a single point but could there be a white hole? a place where stuff that falls into a black hole spews out possibly from the other side of the universe or from a hole different universe?

posted on Sun, 11/30/2008 - 5:00pm
Anonymous's picture
Anonymous says:

In my opinon if this were true then there would have to be at least another universe and possibly the "alien's that might keep in contact with earth. This would also have to change the whole way in how we think on time and the sun and moon and everyting. I also believe that this might just be a way for another man who went to school for over a dozen years can get ahead of his peers. Either way I think it is an intersting take on the universeand how we might perceive it. Endless ideas and possibilities arise from such a thought.

posted on Tue, 01/27/2009 - 12:39am
GiGi's picture
GiGi says:

This is awesome work!! keep it up!!! This really helped me in my project. Yeahhh.

posted on Wed, 12/16/2009 - 10:09am
TVK's picture
TVK says:

Big bounce theory by van Kessel

Black holes are the key to the answer of the big bounce in my opinion. All of the black holes will together swallow up the space surrounding them. Working together as you will.
When eventually the biggest black hole will draw all the other black holes to it. Having swallowed up the mass of the entire universe in one super mass black hole, it will eventually shrink further and further to the point of implosion. That is where the new universe will start.

posted on Wed, 04/27/2011 - 9:05am
Anonymous's picture
Anonymous says:

The Big Bounce isn't so much a new theory as to the origins of our Universe but an expansion on the Big Bang theory. The Big Bang 2.0, if you like.

New universes arising from black holes is one of a group of theories, collectively called Multiverse theory. While there are several different theories, they all have the same basis: our Universe is one out of an infinite number of universes. One of these theories is the idea that any black hole created in any universe is instantaneously connected to a new universe by a worm hole. The white hole is an event: the creation of the new universe by the movement of the matter falling into the black hole through the worm hole into the newly formed universe.

This new theory won't change the way we think about the Sun and the Moon. It's not a completely new theory of space and time. It is simply a revision of the Big Bang, based on the works of Newton, Einstein, and all other great physists just like any other theory is.

Any aliens from other universes would not be able to reach us. If they could, they would have to have a far, far greater understanding of the Mutiverse and physics in general than most of us humans even dream of, and if they were that advanced, why would they bother with us? We would be like ants in their backyard. They know we're smart, but we are nothing in comparison to them. We have just begun to send probe to the outer most parts of our own solar system, and the only alien place we've ever actually walked on is our own moon, so completely close to our home in comparison to the aliens who can travel across solar sytems, galaxies, even whole UNIVERSES! It's pretty self-centered to think they would want to come see us.

And please don't forget that science isn't about "getting ahead of your peers". It's about the human need to KNOW. To know what black holes are, how we get sick, why an apple falling from a tree will hit someone on the head, how our universe began. Science is simply the quest to learn for the sake of learning. An artist doesn't paint to one-up his friends, he paints because he is human, and that's what his mind and his heart tell him to do. His painting is his calling. This is the same way any scientist feels. Science is their calling, they do it because they love it.

posted on Tue, 01/31/2012 - 12:47pm
Mikeykid's picture
Mikeykid says:

M theory talks about membranes crashing together causing a Big Bang. Where did the first membrane come from? Where did the second membrane come from? Since you need 2 membranes crashing together to make a 3rd universe.

posted on Thu, 06/21/2012 - 2:47am

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