On 10/29/2013 10:43 AM, Bruno Marchal wrote:
On 29 Oct 2013, at 17:12, Chris de Morsella wrote:
If true – ESA experimental measurements of the polarization of ranges of gamma rays
(over a range of energies) from very distant gamma ray bursts that have travelled
across billions of light years of spacetime to reach earth. Their experiments
determined that spacetime does not have a granular structure, which would have had a
measurable effect on the polarization of these distant gamma rays, down to a level of
10^-48 m (which is exceedingly small)) trillions of times smaller than the Planck scale.
Spacetime does not appear to be granular – at least down to these incredibly small
scales. These results have lead me to question any hypothesis that seems to depend on
spacetime having a discreet granular structure.
Do you know if those are the results considered as "refuting" "loop gravity"?
I think so. The paper's at arXiv:1109.5191v2. I don't recognize the 1e-48m. The paper
places a limit on the granularity of 525 Planck masses, which is inversely proportional to
length, so it's shorter than 1/525 Planck lengths.
Brent
In fact, I find intuitive that a quantized gravitation lead to a quantization of
space-time curvature, and itself, but comp seems to fit better with continuous space
time, as it multitplies the comp-histories in a very smooth way.
In the universal dovetailing, the winner "universal subdovetailers on the programs
defined on some "rich ring" structure, might be the winner, but of course that remains
to be shown.
Those questions are very hard.
Bruno
*From:*[email protected] <mailto:[email protected]>
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*Sent:*Tuesday, October 29, 2013 7:04 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Universe from Pixels?
Here is a link, which makes things seem very, curious, if true.
http://www.dailygalaxy.com/my_weblog/2013/10/our-universe-is-made-up-of-indivisible-building-blocks-like-tiny-atoms.html#more
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