On 12/23/2018 9:49 PM, Jason Resch wrote:
On Sun, Dec 23, 2018 at 11:49 PM Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
On Mon, Dec 24, 2018 at 3:45 PM Jason Resch <[email protected]
<mailto:[email protected]>> wrote:
On Sat, Dec 22, 2018 at 9:33 PM Brent Meeker
<[email protected] <mailto:[email protected]>> wrote:
On 12/22/2018 12:04 PM, Philip Thrift wrote
https://www.eurekalert.org/pub_releases/2018-12/lsu-be122018.php
Theoretical physicists developed a theory called loop
quantum gravity in the 1990s that marries the laws of
microscopic physics, or quantum mechanics, with gravity,
which explains the dynamics of space and time. Ashtekar,
Olmedos and Singh's new equations describe black holes in
loop quantum gravity and showed that black hole
singularity does not exist.
"In Einstein's theory, space-time is a fabric that can be
divided as small as we want. This is essentially the
cause of the singularity where the gravitational field
becomes infinite. In loop quantum gravity, the fabric of
space-time has a *tile-like structure*, which cannot be
divided beyond the smallest tile. My colleagues and I
have shown that this is the case inside black holes and
therefore there is no singularity," Singh said.
"These tile-like units of geometry--called 'quantum
excitations'-- which resolve the singularity problem are
orders of magnitude smaller than we can detect with
today's technology, but we have precise mathematical
equations that predict their behavior," said Ashtekar,
who is one of the founding fathers of loop quantum gravity.
But is this consistent with
https://arxiv.org/abs/1109.5191v2 which showed spacetime
to be smooth down to 1/525 of the Planck length?
Brent,
Wouldn't this be a successful prediction of Bruno's theory?
In another thread you said it had only made retrodictions, but
wasn't one of Bruno's predictions that space and time would be
continuous (not discrete), therefore it would predict LQG is
false, and then https://arxiv.org/abs/1109.5191v2 would be a
confirmation of that.
How did Bruno predict that from a digital (integral) model)?
https://groups.google.com/d/msg/everything-list/zq6LVIjhrn0/kVZao94IeGkJ
(A post from 2007, citing his work from 2004)
The essential idea is that the first person experience of a physical
world, and of making predictions or measurements involves infinite
numbers of competing programs going through and realizing the state of
the observer's mind at one point in time. Predicting what happens
next, the outcome of an experiment, a measurement of a particle's
location, etc. involves the statistics concerning the infinity of
these programs. It means the physical appearances/physical universe is
itself not computable (not without infinite time and resources), and
this implies a continuum somewhere in physics. (i.e. eechanism is
incompatible with digital physics)
Being not computable is not the same as being a continuum.
The gamma ray observation assumes certain things about the interaction
of photons with space and I think it assumes a roughly uniform "tiling"
so it may not be definitive. But it brings up my point that the long
sought quantum theory of spacetime my throw a monkey wrench in Bruno's
"predictions".
Brent
And where did he make such a prediction?
https://groups.google.com/d/msg/everything-list/2numMVaxsJ0/QePUwROUln4J
(post from 2007, explaining the continuum)
https://groups.google.com/d/msg/everything-list/yKiXo8jB7VY/VxqraVyz5c4J
(post from 2009, describing that physics cannot be entirely
computational if "I am a machine")
https://groups.google.com/d/msg/everything-list/QuedsKrpW4g/C6pAbJItvfMJ
(post from 2009, pointing out that if digital physics is true, then
mechanism would be refuted)
Jason
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