On Sunday, January 20, 2019 at 7:09:13 PM UTC-6, John Clark wrote:
> On Sun, Jan 20, 2019 at 5:55 PM Philip Thrift <cloud...@gmail.com 
> <javascript:>> wrote:
> > As for LQG's "quantum geometry" being empirical, as I posted before
>> *Glimpses of Space-Time Beyond the Singularities Using Supercomputers*
>> https://arxiv.org/abs/1809.01747 
> I see nothing empirical in that, it's a supercomputer simulation. It's 
> saying "maybe this is what's going on when things get smaller than the 
> Planck length", well maybe it is and maybe it isn't. I saw no experiment or 
> even a proposed  experiment that could tell us. Perhaps someday Loop 
> Quantum Gravity or String Theory will be able to make a testable 
> prediction but they're not there yet so until then it's mathematics not 
> physics. 
> > Why are people so wedded to the traditional spacetime.
> Because they're wedded to the scientific method.  I asked before how you 
> could perform an experiment without making use of space or time but 
> received no answer. 
>  John K Clark
My understanding of what the LQG Black Hole team (Abhay Ashtekar and Javier 
Olmedo at Penn State and Parampreet Singh at Louisiana State University) is 
up to

    *Beyond the black hole singularity*

is to show that their model matches astronomical data better than other 
theories (which is sort of the way science works).

There is a lot of scientific theory that doesn't really mention space: 
theories in chemistry and biology for example. These have to do with change 
of structures (molecules, cells).

But time is interesting. It is possible to have a discrete space (the title 
subject of this topic) but a continuous time.

- pt


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