Cart Before the Horse?

The common understanding is that the universe's expansion stretches the wavelengths of light, causing the cosmic microwave background (CMB) radiation to redshift. But flipping it around, if light pressure were causing the expansion, it would mean light is somehow pushing the universe to grow.
The early universe would have the greater pressure. Another Dark Energy contender - how daft is this? :neutral:
 

Thermoman

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I was taught light is massless photons; so what force can a photon apply? It's a result, not a cause.
A Photon has mass-B !

Mass-B is a quantitative measure of inertia , a property of light by which it continues in its existing state of rest or uniform motion in a straight line. Mass-B can be considered a dynamic measure relative to the magnitude of light occupying the same place at the same time . Mass-B can be considered a necessity for all movement within a Quantum Mainframe
 
Thought experiment:

Two galaxies will receive light pressure from each other. Tiny though this may be it exists. Now consider the pressure interplay between all galaxies. The space between them will be stretched.
Logically this is Dark Energy (Even if it is only a tiny bit)

I have no idea how to quantify this and would not expect it to cause an acceleration of expansion (because I think acceleration is false) but it might explain why gravitation does not cause collapse, maybe

So I would look to find some 'near balance' mechanism. But I am too ignorant! lol.
 
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;) The universe is dark due to an infinite density of coordinate points photonic photo-frame past-future histories SPACETIME . . . the translucent, transparent, immaterially-materially Flatland universe-fine quantum 'aether'.:rolleyes:

Oops, to be continued maybe . . . I'm being summoned by my lady!
 
I'm back . . . and speaking of "back", there is no catching, no back, no rear, to single-sided photonic photo-frame past-future histories SPACETIME . . . just frontage only. Race into a front facing of light-SPACETIME and turn around only to always come face-to-face into another front facing of light-SPACETIME only (a single-sided 2-dimensional photonic photo-frame past-future histories SPACETIME).

Is it any wonder you can never outrun light to catch up to it since there is no such thing as a rear to catch up to to it?!
 
You lost me! Try on this as illustration:


There is a simple reason there is no loss, never a loss, of energy to the single-sided 2-d flatland photo-frame facing that has no back . . . no rear . . . no 'train', no 'tail', of history. Only numbered bits in series, in pages, of following facing faces.

You observe a laser beam from the side. You only think you are observing a solid beam, end to end! You are not! And by what is the observation -- you are facing into as the observer -- brought to you by?! Turn around . . . into pages of another single-sided 2-d flatland photo-frames facing . . . no rear, no back, no train, no tail. to what was facing! An infinite density in universe of mass-energy-less holes, voids, regarding the back, the rear!

Thus the SPACETIME universe is in fact all one-sided front! That is, except for all the other fronts, a many sided crossroads meeting of frontage alone (Hawking's singularly many sided particle that is, at one and the same time, many individual particles, plural!
 
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Oct 25, 2024
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The common understanding is that the universe's expansion stretches the wavelengths of light, causing the cosmic microwave background (CMB) radiation to redshift. But flipping it around, if light pressure were causing the expansion, it would mean light is somehow pushing the universe to grow.
The early universe would have the greater pressure. Another Dark Energy contender - how daft is this? :neutral:
Assuming the universe is finite, beyond the border there must be is nothing. If there were something, it would be part of the universe. The great void would have no pressure, since pressure would be something. Since the universe has pressure, it would rush to fill the void. Adding something to the void, makes it part of the universe (I.e. the universe expands). Assuming there is a fixed amount of matter/energy in the universe, as the universe loses it pressure to the great void, wouldn’t the rate of expansion decrease over time?
 
Aug 15, 2024
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Assuming the universe is finite, beyond the border there must be is nothing. If there were something, it would be part of the universe. The great void would have no pressure, since pressure would be something. Since the universe has pressure, it would rush to fill the void. Adding something to the void, makes it part of the universe (I.e. the universe expands). Assuming there is a fixed amount of matter/energy in the universe, as the universe loses it pressure to the great void, wouldn’t the rate of expansion decrease over time?
Therefore the universe must be infinite.
 
It is not possible to get to the "great void" by us or anything else. Think of the universe as the surface of a sphere. You can travel on it's surface is all.
It was expected that gravity would gradually slow expansion but the red shift was larger than expected 'they' discovered (and picked up a Nobel prize or two). The larger Redshift was assumed to indicate that the distant stars were further away and the universe was accelerating.
As no obvious cause could be found it was decided to give the cause a name. That is "Dark Energy".
Therefore the universe must be infinite.
Not necessarily.