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From: YKhan on 30 May 2010 15:07
This link is a bit of a long read, and a bit terse at times. But he is
describing a quantum-gravity theory that could explain the mechanisms
behind Dark Energy, but the Cosmological Constant cannot.

Yousuf Khan

***
Toward Quantum Gravity? Discrete Space, Dark Energy And the Real
Line : NPR
"But the Cosmological Constant has remerged as a start to account for
Dark Energy. With it, one can achieve an accelerating expansion of the
universe. The Cosmological Constant is as if there were a “repulsive
force” in space, pushing any two regions of space further apart, and
the more so as their distance apart increases.

Einstein realized that his Cosmological Constant implied an increasing
energy in the expanding universe, such that the vacuum energy per unit
volume remained constant. This flies in the face of the Big Bang
belief that all the energy of the universe came to exist in that
Bang. Well, OK, so it does.

The problem is, there is, in a deep sense, no physics behind the
Cosmological Constant, it is just a constant added the only place
Einstein could in his equations and keep the rest of the physics of
General Relativity unmodified. "
http://www.npr.org/blogs/13.7/2010/05/28/127234796/discrete-space-dark-energy-and-the-real-line-toward-quantum-gravity
From: eric gisse on 30 May 2010 16:19
YKhan wrote:

> This link is a bit of a long read, and a bit terse at times. But he is
> describing a quantum-gravity theory that could explain the mechanisms
> behind Dark Energy, but the Cosmological Constant cannot.
>
> Yousuf Khan
>
> ***
> Toward Quantum Gravity? Discrete Space, Dark Energy And the Real
> Line : NPR
> "But the Cosmological Constant has remerged as a start to account for
> Dark Energy. With it, one can achieve an accelerating expansion of the
> universe. The Cosmological Constant is as if there were a ?repulsive
> force? in space, pushing any two regions of space further apart, and
> the more so as their distance apart increases.
>
> Einstein realized that his Cosmological Constant implied an increasing
> energy in the expanding universe, such that the vacuum energy per unit
> volume remained constant. This flies in the face of the Big Bang
> belief that all the energy of the universe came to exist in that
> Bang. Well, OK, so it does.
>
> The problem is, there is, in a deep sense, no physics behind the
> Cosmological Constant, it is just a constant added the only place
> Einstein could in his equations and keep the rest of the physics of
> General Relativity unmodified. "
> http://www.npr.org/blogs/13.7/2010/05/28/127234796/discrete-space-dark-
energy-and-the-real-line-toward-quantum-gravity

Lot's of words. Let's see if he can craft it into a mathematical theory.
From: YKhan on 31 May 2010 00:26
On May 31, 2:19 am, eric gisse <jowr.pi.nos...(a)gmail.com> wrote:
> Lot's of words. Let's see if he can craft it into a mathematical theory.

Actually, it's already a mathematical theory, it's called Loop Quantum-
Gravity. The author of the article said in the article that he was
physically describing the LQG theory as described to him by Lee
Smolin.

Yousuf Khan
From: YKhan on 31 May 2010 00:31
On May 31, 9:47 am, Surfer <n...(a)spam.net> wrote:
> Very nicely put.
>
> Stuart Kauffman's proposal for physicists to model the expansion of
> space with self replicating tetrahedra is thoughtful, but if the
> tetrahedra are sufficiently small, then it should be possible to
> describe their bulk motion by equations similar to those used in fluid
> dynamics.

Actually it's not Stuart Kauffman's (i.e. the article writer's)
theory. He said he is just physically describing Lee Smolin's Loop
Quantum-Gravity in that article.

Yes, as far as describing space like a fluid that seems to be a
popular line of research these days. Other proposals have been made
about it too, for example the theory called Dark Fluid.

Dark Fluid: Dark Matter And Dark Energy May Be Two Faces Of Same Coin
http://www.sciencedaily.com/releases/2008/01/080131094056.htm

> As it happens, such equations have been developed and they can indeed
> describe the expansion of the universe without dark energy or the
> cosmological constant.
>
> Details here:
>
> Unravelling the Dark Matter - Dark Energy Paradigm
> Reginald T Cahill (Flinders University)http://arxiv.org/abs/0901.4140

I'll have to read this slowly.

Yousuf Khan
From: eric gisse on 31 May 2010 01:18
YKhan wrote:

> On May 31, 2:19 am, eric gisse <jowr.pi.nos...(a)gmail.com> wrote:
>> Lot's of words. Let's see if he can craft it into a mathematical theory.
>
> Actually, it's already a mathematical theory, it's called Loop Quantum-
> Gravity. The author of the article said in the article that he was
> physically describing the LQG theory as described to him by Lee
> Smolin.
>
> Yousuf Khan

I saw that, but as of yet I have not seen LQG make a testable prediction.


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