Re: S paceTime

Am Sonntag000016, 16.02.2025 um 06:44 schrieb The Starmaker:

Physfitfreak wrote:

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On 2/15/25 2:10 AM, The Starmaker wrote:

The bottom line is that you have two different opinions:
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Newton says space and time are two separate entities.
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Einstein’s sez  space and time are two entwined entities.

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You need to replace the word "entity" with "physical quantities". That's
how they're referred in physics.
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But outside physics tools and procedures, time and "change" and ...
anything requiring a memory mechanism activity inside a life form, is
meaningless. They're just fixtures concocted by some life forms only,
and only exists inside them. They didn't decide to create and use such
concept either. It just happened that those who had a thing about it,
got to last better than those who didn't.
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You're a life form, Star :)

 I can only go by the official words of Physics that 'they' used:entities
  https://archive.org/details/a-dictionary-of-physics/page/n841/mode/2up
 https://archive.org/details/a-dictionary-of-physics/page/n841/mode/2up
    space—time (space-time continuum) "A geometry that includes the three dimensions and a
 fourth dimension of time. In Newtonian physics, space and time are considered as separate entities and whether or not events are simultaneous is
a matter that is regarded as obvious to any competent observer. In Einstein’s concept of the physical universe, based on a
system of geometry devised by Hermann Minkowski (1864—1909), space and time are regarded as entwined, so that two observers
in relative motion could disagree regarding the simultaneity of distant events. In Minkowski’s geometry, an event is identified by a world point in a fourdimensional continuum."
  

Time is not a dimension of spacetime!
The word dimension means in connection to space something like 'distance'.
'spacetime' is therefore NOT something like 'Euclidean space plus time'!
In fact time is not really a spatial dimension, because we cannot move in time. Actually we are bound to what is called 'now' and past and future are just imaginary.
Actually time itself is imaginary, what could be understood as 'rotation' by the imaginary unit i, which is equivalent to 90°.
This could be seen the other way round and we have the antagonistic behavior of space, which is therefore real (valued) for any given axis of time.
Now spacetime does not have four dimensions, because the word 'dimension' (of space) refers to the subset of spacetime we call 'space'.
In fact spacetime has more dimensions then four, because we could use 'complex four vectors' (aka 'biquaternions') as pointlike elements of spacetime, which have eight components.
For any given axis of time this splits into space and time, which creates also an imaginary 'anti-world', where time runs seemingly backwards.
This entire thing is then 'spacetime' and each element has eight components, which we could call 'dimensions' (in a mathematical way).
TH