On Sat, Feb 18, 2017 at 5:07 PM, Brent Meeker <[email protected]> wrote:


> ​> ​
> he
> ​[Einstein] ​
> didn't notice that it was an unstable equilibrium - a very elementary
> mistake.
>

​I would humbly submit that when trying to figure out what 4-dimensional
non-Euclidean
Tensor calculus
​is telling you about physics ​
nothing
​ is very elementary, especially not in 1917.​



> ​> ​
> But the holographic principle can yield a value close the the observed.
>

​How close? In science ​if your theory predicts something that differs from
the observed value by a factor of 2 that's generally considered to be
pretty damn bad, and we're talking about 10^120. They may have come up with
something closer than 10^ 120, but close? I don't think so; at least not
unless they worked backward and invented a 120 digit number and inserted it
ad hoc into the theory so things come out right. But that would be cheating
because if you can't get more out of a theory than you put in it has no
use, and a 120 digit number is a lot to put in. I don't think we're going
to have a good explanation for Dark Energy anytime soon, but I hope I'm
wrong.


> ​> ​
> Sean Carroll has considered this in his review article
> https://arxiv.org/abs/astro-ph/0004075v2
>

​That article is 17 years old, and Dark Energy is as big a mystery now as
it was then.

John K Clark​



>

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