|
HagbardCeline
Student-Teacher-Student-Teacher



Registered: 05/10/03
Posts: 10,028
Loc: Overjoyed, at the bottom ...
Last seen: 20 days, 17 hours
|
Loop Quantum Cosomology
#9406810 - 12/10/08 02:34 PM (15 years, 5 months ago) |
|
|
New Scientist has an interesting article explaining a new theory about the origins of the universe. I had heard about this before but in something about as short as what I write now. Basically LQC explains that the universe did not come from a singularity as the conventional big bang theorizes, but from a big bounce caused by the collapse or contraction of our universe. It's possible that this expansion and contraction has gone on forever.
On that note, one of the points of contention with the theory is whether or not their is any type of cosmic recall which would mean that things would develop in basically the same way every time. There is a paper on this subject called Quantum bounce and cosmic recall that I wonder if anyone has access to as I very much want to continue reading about this.
-------------------- I keep it real because I think it is important that a highly esteemed individual such as myself keep it real lest they experience the dreaded spontaneous non-existance of no longer keeping it real. - Hagbard Celine
|
deimya
tofu and monocle


Registered: 08/26/04
Posts: 825
Loc: ausländer.ch
|
|
Log in to view attachment
Here's the paper, please do come back to tell us about it 
I wonder how LQG people are managing with their Immirzi parameter, hopefully they can get us some nice falsifiable predictions soon. For now, just as for superstring theory, err, hypothesis, all these construction are not even wrong.
Edited by deimya (12/10/08 03:51 PM)
|
milkman
DeliveringWorldWide



Registered: 07/04/07
Posts: 2,108
Loc: tha FLA
Last seen: 6 months, 16 days
|
Re: Loop Quantum Cosomology [Re: deimya]
#9408944 - 12/10/08 07:54 PM (15 years, 5 months ago) |
|
|
until something is proved i believe that our milky way has a "big bang" every how many ever billions of years, all the stars eventually converge into the center of the milky way then explode back out then form planets. And our galaxy is just another "star" that converges into a bigger galaxy that explodes like our milky way but on a bigger scale.
|
HagbardCeline
Student-Teacher-Student-Teacher



Registered: 05/10/03
Posts: 10,028
Loc: Overjoyed, at the bottom ...
Last seen: 20 days, 17 hours
|
Re: Loop Quantum Cosomology [Re: milkman]
#9409228 - 12/10/08 08:44 PM (15 years, 5 months ago) |
|
|
So you're saying you believe that every galaxy follows the same expansion and contraction of the universe while the universe itself is following the same pattern?
Why?
I'm pretty sure if that were happening it would have been observed as we can see millions of galaxies all the way up to nearly 14 billion years ago and this has, as far as I know, never been happened. Think about it, we would be able to see this over and over throughout all phases if it were true. Again, why do you believe this?
-------------------- I keep it real because I think it is important that a highly esteemed individual such as myself keep it real lest they experience the dreaded spontaneous non-existance of no longer keeping it real. - Hagbard Celine
|
BeyondN0thing
Stranger



Registered: 12/09/08
Posts: 36
Loc: yellow submarine
Last seen: 15 years, 4 months
|
|
no but in fact our solor system did not just come from our sun being born but must have been a supernova... as our sun can not get hot enough to forge atoms over iron.. finding uranium on the planet proves this
-------------------- -=-=-=-=-=-=-=- ~jmfb~
|
Stonehenge
Alt Center

Registered: 06/20/04
Posts: 14,850
Loc: S.E.
|
|
I too think the universe contracts into a big crunch and has another big bang afterward. It just keeps on and on. Our whole universe is probably just a tiny particle in some huge universe with a much slower time system. We may go from big bang to big crunch 100 million times a second in that bigger universe.
-------------------- “A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship.” (attributed to Alexis de Tocqueville political philosopher Circa 1835) Trade list http://www.shroomery.org/forums/showflat.php/Number/18047755
|
HagbardCeline
Student-Teacher-Student-Teacher



Registered: 05/10/03
Posts: 10,028
Loc: Overjoyed, at the bottom ...
Last seen: 20 days, 17 hours
|
|
Well this really doesn't have anything to do with his belief that galaxies experience this same expansion and contraction of the universe, but you are partly correct. From what I've read there is still a lot of debate about where the supernova occurred. It may have been a supernova that birthed our solar system or it may have simply been one that occurred nearby. Or there are several other theories that don't even require a supernova.
Again though, this really has nothing to do with this thread.
-------------------- I keep it real because I think it is important that a highly esteemed individual such as myself keep it real lest they experience the dreaded spontaneous non-existance of no longer keeping it real. - Hagbard Celine
|
Feynman
Renowned Stranger

Registered: 10/06/11
Posts: 4
Last seen: 12 years, 6 months
|
|
Thats not a new theory but a very old one, it was in the early 1900s when Fred Hoyle proposed that the universe has no begining or end and coinded the term Big Bang.
personaly I find the Big Bang theory to be quite strong. Most people ask well then were did the matter and anti-matter come from? Well the spontaniously came into existance. Which sounds very hand wavey but actually makes the theory stronger, -When Energy-Mass didnt exist spacetime did not exist either -Since there was a net Energy-Mass of zero Quantum Flucuations had to create coupled particles & anti-partiles giving the universe a net energy-mass of zero
Quantum Flucuation are the flucuations of energy in the quantum field at absolute zero (classically theorized to have the absense of motion since there would not exist any kinetic energy)
|
Noteworthy
Sophyphile


Registered: 10/05/08
Posts: 5,599
Last seen: 11 years, 3 months
|
Re: Loop Quantum Cosomology [Re: Feynman]
#15195017 - 10/08/11 07:54 AM (12 years, 7 months ago) |
|
|
actually the problem with that theory is that quantum fluctuations cannot exist without some sort of space/time for them to occur in.
im quite inclined to dismiss the big bang theory on the grounds that it is no more useful than a 'big bounce' theory and at least big bounce theories do not require a begginning of the universe, NOR do they require that the whole universe is involved in the bounce/bang
--------------------

|
Stonehenge
Alt Center

Registered: 06/20/04
Posts: 14,850
Loc: S.E.
|
Re: Loop Quantum Cosomology [Re: Noteworthy]
#15195583 - 10/08/11 11:19 AM (12 years, 7 months ago) |
|
|
The big bang - big crunch theory covers all of that. The universe expands until it reaches a point at which it stops expanding and starts contracting. The contraction persists until all coalesces into a black hole which collapses on itself. At this stage the universe is the size of a mathematical point. It then explodes, perhaps into another dimension and we have another big bang. So the universe has no beginning or end. It just goes through these cycles.
-------------------- “A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship.” (attributed to Alexis de Tocqueville political philosopher Circa 1835) Trade list http://www.shroomery.org/forums/showflat.php/Number/18047755
|
Noteworthy
Sophyphile


Registered: 10/05/08
Posts: 5,599
Last seen: 11 years, 3 months
|
Re: Loop Quantum Cosomology [Re: Stonehenge]
#15198573 - 10/09/11 12:16 AM (12 years, 7 months ago) |
|
|
yeah that theory needs a lot more work. eg. the expansion of the universe appears to be accelerating in our corner of the universe.
Otherwise its just another version of the big bounce theory.
--------------------

|
fallguy
sane?



Registered: 10/01/06
Posts: 100
Loc: home
Last seen: 1 month, 17 days
|
Re: Loop Quantum Cosomology [Re: Noteworthy]
#15199698 - 10/09/11 10:29 AM (12 years, 7 months ago) |
|
|
7,000 years ago god built the universe in six days then he rested on day 7.
|
|