What is spacetime?

[socrattus]

What is spacetime?
Everything in SRT, GRT and quantum mechanics is done in so-called "space-time",
which is a kind of virtual 4D geometry.
But if SRT is correct and if QM is the basis for successful modern technology,
then space-time cannot be a virtual, abstract structure.
Space-time must be a real structure, real a frame of reference.
What is it? ....
1) Everything exists in the infinite, eternal, flat, cold cosmic vacuum. ...
2) Only in the cosmic vacuum are space and time one inseparable system (as is space-time) ...
3) One of Einstein's special relativity states: the speed of light in a vacuum is
constant and independent (as in space-time) ...
4) Dirac's formula E= ± mc² belongs to the system of "vacuum sea" ...
Spacetame is the cosmic vacuum.
‘'The problem of the exact description of vacuum, in my opinion, is the basic problem
now before physics. Really, if you can’t correctly describe the vacuum, how it is possible
to expect a correct description of something more complex?'' /Paul Dirac/
Book ''The Fermi Solution'':
''. . . something seems wrong with our idea of the vacuum. It is we who abhor a vacuum,
who recoil from the stillness of the void as from an open grave.''
/page 37-38, by Hans Christian von Baeyer /

[accelafine]

What is spacetime?
Everything in SRT, GRT and quantum mechanics is done in so-called "space-time",
which is a kind of virtual 4D geometry.
But if SRT is correct and if QM is the basis for successful modern technology,
then space-time cannot be a virtual, abstract structure.
Space-time must be a real structure, real a frame of reference.
What is it? ....
1) Everything exists in the infinite, eternal, flat, cold cosmic vacuum. ...
2) Only in the cosmic vacuum are space and time one inseparable system (as is space-time) ...
3) One of Einstein's special relativity states: the speed of light in a vacuum is
constant and independent (as in space-time) ...
4) Dirac's formula E= ± mc² belongs to the system of "vacuum sea" ...
Spacetame is the cosmic vacuum.
‘'The problem of the exact description of vacuum, in my opinion, is the basic problem
now before physics. Really, if you can’t correctly describe the vacuum, how it is possible
to expect a correct description of something more complex?'' /Paul Dirac/
Book ''The Fermi Solution'':
''. . . something seems wrong with our idea of the vacuum. It is we who abhor a vacuum,
who recoil from the stillness of the void as from an open grave.''
/page 37-38, by Hans Christian von Baeyer /

'Dirac's formula'? Really?

Btw, Einstein said, 'You do not really understand something unless you can explain it to your grandmother'. Sexist I know but then Einstein lived by his own rules

[Impenitent]

my favorite Einstein quote: "Who took my comb?"

-Imp

[socrattus]

my favorite Einstein quote: "Who took my comb?"

-Imp

My favorite quote about Einstein: ''During our crossing, Einstein explained his theory to me every day,
and by the time we arrived I was fully convinced he understood it.''
/ Chaim Weizmann, 1921, after he escorted Einstein to the United States./

[socrattus]

Vacuum energy
https://en.wikipedia.org/wiki/Vacuum_energy

[Eodnhoj7]

What is spacetime?
Everything in SRT, GRT and quantum mechanics is done in so-called "space-time",
which is a kind of virtual 4D geometry.
But if SRT is correct and if QM is the basis for successful modern technology,
then space-time cannot be a virtual, abstract structure.
Space-time must be a real structure, real a frame of reference.
What is it? ....
1) Everything exists in the infinite, eternal, flat, cold cosmic vacuum. ...
2) Only in the cosmic vacuum are space and time one inseparable system (as is space-time) ...
3) One of Einstein's special relativity states: the speed of light in a vacuum is
constant and independent (as in space-time) ...
4) Dirac's formula E= ± mc² belongs to the system of "vacuum sea" ...
Spacetame is the cosmic vacuum.
‘'The problem of the exact description of vacuum, in my opinion, is the basic problem
now before physics. Really, if you can’t correctly describe the vacuum, how it is possible
to expect a correct description of something more complex?'' /Paul Dirac/
Book ''The Fermi Solution'':
''. . . something seems wrong with our idea of the vacuum. It is we who abhor a vacuum,
who recoil from the stillness of the void as from an open grave.''
/page 37-38, by Hans Christian von Baeyer /

Time is the dimension of space expanding or contracting relative to another space. A second hand on clock moving to another point over is the hand repeating in a new space where this expansion of space, by the repetition, is time. Dually it can be view as contraction as well as the new position is a contraction of space, a localization or distinction of it, relative to potential space.

Now if one looks at the nature of expansion and contraction it is repetition of distinctions into inverse forms of a singular where contraction into a single point is a minute singularity, that on its own terms is limitless, and expansion into a broad singularity, that on its terms is limitless. Either means, expansion or contraction, is a change towards a potential singularity where boundaries are negated by an act of completion by which a deficit of change occurs.

That is one of many ways of looking at it.

[Impenitent]

when there is no human to measure it, does time actually exist?

-Imp

[socrattus]

Time is the dimension of space expanding or contracting relative to another space. ....
That is one of many ways of looking at it.

"The views of space and time which I wish to lay before you have sprung from the soil of experimental physics,
and therein lies their strength. They are radical. Henceforth, space by itself, and time by itself, are doomed
to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality."
/Hermann Minkowski /

[Eodnhoj7]

when there is no human to measure it, does time actually exist?

-Imp

Without the occurence of experience is there anything that exists?

[Impenitent]

I'll see you on the dark side of the moon...

-Imp

[Eodnhoj7]

Time is the dimension of space expanding or contracting relative to another space. ....
That is one of many ways of looking at it.

"The views of space and time which I wish to lay before you have sprung from the soil of experimental physics,
and therein lies their strength. They are radical. Henceforth, space by itself, and time by itself, are doomed
to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality."
/Hermann Minkowski /

Time is merely the division of space through space as a space.

Is this assertion unorthodox? Yes....oh well...

[Frank M. DiMeglio]

What is E=mc² is consistent with TIME, time dilation, and what is the FOURTH spatial dimension, as electromagnetism is gravity.

By American Author Frank Martin DiMeglio

[Cerveny]

Space-time is a condensing / growing 4D crystal of causality - the past - on its 3D surface a quantum process - the present - "burns". Time is a direction orthogonal to the past...

[Cerveny]

Space-time is a condensing / growing 4D crystal of causality - the past - on its 3D surface a quantum process - the present - "burns". Time is a direction orthogonal to the past...

Quantum interaction, “measurement” makes the q system “manifest” and fixes it in causality, glues it into the new Planck sediment of time on the surface of the past…

[Age]

What is spacetime?
Everything in SRT, GRT and quantum mechanics is done in so-called "space-time",
which is a kind of virtual 4D geometry.
But if SRT is correct and if QM is the basis for successful modern technology,
then space-time cannot be a virtual, abstract structure.
Space-time must be a real structure, real a frame of reference.
What is it? ....

If any one has claimed that there is such a thing as so-called, 'spacetime', then they would know what 'it' is, would they not?

And, if any one has claimed that there is 'spacetime', then did they write down what 'it' is, or tell anyone else what 'it' is?

If no, then why not?

1) Everything exists in the infinite, eternal, flat, cold cosmic vacuum. ...

What do you mean by 'flat', here, and is there no heat anywhere?

2) Only in the cosmic vacuum are space and time one inseparable system (as is space-time) ...

Why do you claim 'this' for, exactly?

And, what is 'space', and, 'time', exactly, which you claim is 'space-time', exactly?

Also, if there are 'things' in what you call 'cosmic vacuum', then where is this supposed and alleged 'cosmic vacuum', exactly? Obviously, there is not a 'vacuum' if there are things 'in it'.

3) One of Einstein's special relativity states: the speed of light in a vacuum is
constant and independent (as in space-time) ...

Could that human being being Wrong?

If that human being claimed that there is 'spacetime', then did it inform any one of what 'spacetime' even is, exactly?

If it did, then why are you asking, 'What is spacetime', here?

4) Dirac's formula E= ± mc² belongs to the system of "vacuum sea" ...
Spacetame is the cosmic vacuum.

What is 'vacuum sea', exactly?

And, if 'spacetime' is 'the cosmic vacuum', then why does the 'one thing' go by two terms?

‘'The problem of the exact description of vacuum, in my opinion, is the basic problem
now before physics.

If you can not define, nor describe', what 'vacuum' is, exactly, then why say and claim that there is one, and there is one with things existing within it?

Really, if you can’t correctly describe the vacuum, how it is possible
to expect a correct description of something more complex?'' /Paul Dirac/
Book ''The Fermi Solution'':

If one can not describe what 'vacuum', 'cosmic vacuum', 'space', 'time', nor 'spacetime', then why even claim they exist?

It would be like claiming that 'God' exists, but never being able to even just describe what 'God' is.

''. . . something seems wrong with our idea of the vacuum. It is we who abhor a vacuum,
who recoil from the stillness of the void as from an open grave.''
/page 37-38, by Hans Christian von Baeyer /

So, some one says and/or writes 'this', here, and you presented it in regards to 'what', exactly?