Re: SpaceTime

Am Samstag000001, 01.06.2024 um 15:35 schrieb gharnagel:

Tom Roberts wrote:

>
On 5/30/24 12:48 AM, Thomas Heger wrote:

>
Spacetime is simply what exists, [...]

>
No, NOT AT ALL! You REALLY do not understand very basic physics, at a
fundamental level that distorts all your 'thinking' and everything you
write.
>
Spacetime is a MODEL of spatial-temporal relationships observed in the
real world.
>
Tom Roberts

 I tend to think of physics that way, too, but I was watching this
episode
of How the Universe Works called "The Mystery of Space Time" and had a
few
issues with it:
 "Space-time is the fabric of our reality"
 "The universe is made of space-time"
 "Whatever the substance is, time and space bound together, that's
expanding
and creating the universe we see around us.  It's everything. Space-time
is what the universe really is."

Well, sounds good!
I had written kind of 'book' about this idea and called it 'structured spacetime'.
This can be found here:
https://docs.google.com/presentation/d/1Ur3_giuk2l439fxUa8QHX4wTDxBEaM6lOlgVUa0cFU4/edit?usp=sharing
The idea behind it is quite simpel:
if GR and QM are somehow valid, there must be a way to bring both systems into a consistent relation.
My own approach was: start at the GR side and with some sort of real existing spacetime.
The observed world is then the local 'subchapter', which is seen from where we (or any other observer) are placed.
This world has to have fewer dimensions than spacetime.
Spacetime must also be coordinates free and having no beginning and no end.
Seen from our local perspective this looks different (hence big bang theory), but we and our perspective are not particularily important.
...
TH