On 2/18/2017 3:14 PM, John Clark wrote:
On Sat, Feb 18, 2017 at 5:07 PM, Brent Meeker <[email protected]
<mailto:[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.
It's not a matter of working backward; it's discarding the idea that
quantum fields zero-point energy fills volumes of space. From Hsu's paper;
Note that Lambda_qm is the value that has been calculated as off by a
factor of 1e120. Lambda_0 is a purely geometrical term - Einstein's
constant of integration. The current estimate is 1e-12 eV^4. So Hsu is
off by two orders of magnitude on the negative energy density.
Brent
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
<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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