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The massive gravity theory
The massive gravity theory has the point that the gravity waves are obeying the speed of light. The measurement of the speed of gravity waves is telling that the part of the gravity waves should reach the speed of the light. But the argument against that kind of thing is that measurement will happen by using the gravity wave's interaction with the radio waves, and the problem is that the radio waves are traveling at the speed of light.
So the measurement goes like this that the planet Jupiter is changing the trajectory of the gravity waves. And then they affect the radio waves. The image of that measurement is seen in the texts below this text. So I don't put it in here. But the measurement seems to prove that gravity waves can reach the speed of light. But is the gravity wave acting like other radiation? The point is that the nature of gravity is unknown. We know that gravity can be so strong, that even the light cannot escape from the gravity field.
But does the gravity obey other gravity fields, and is it the radiation? And does that radiation the same nature as the light? If gravity has the same states as light, that means that it should have the wave movement and particle form. So the researchers think that gravity has many similarities with light. The light cannot curve by using electromagnetic fields, but other particles are interacting with light by curving it by the gravity field. And light cannot escape from the black holes, because gravity is so strong, that it pulls photons inside that object.
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Image II
The expansion of the universe and the overenergetic particles
Energy has the attempt to reach the zero point. That means that every single particle would release energy in the form of radiation until it has released all the energy, which is stored in it. The spin of particles is ending someday and that means they have released all their energy, and energy cannot vanish. It can turn the radiation, and that means the density of the radiation or wavelength of wave movement would increase, while the universe is expanding. So the energy in the universe is limited.
The reason for the expansion of the universe is the cosmic (microwave) background radiation, which pulls the galaxies away from the point where the big bang happened. The cosmic background radiation will push the edge of the universe away from the point, where the big bang happens. In some theories in that point is the giant black hole and its gravity will resist the expansion of the universe.
Or maybe the interaction between the particles of the universe makes that thing. So the cosmic background radiation is one of the reasons, why the bubble, what we are calling the universe is expanding. The thing that might also affect the expansion of the universe is that the entire universe is full of extremely small black holes.
So the dark matter will be only the material, what is in the black holes. In some other explanations, the reason for the cosmic background radiation is that the particles of the universe are somehow overenergetic. This could mean that the very fast spin can cause the particles in the universe are too heavy.
And that could explain the cosmic background radiation by using the explanation that when the electron or some other particle is spinning too fast, that particle would dismantle the energy load by sending energy like photons. So if the particles like quark would spin too fast that thing would also send the radiation, which researchers cannot just measure. But the fact is that we are still forming many theories.
Sources:
Cosmic microwave background radiation: https://en.wikipedia.org/wiki/Cosmic_microwave_background
Massive gravity: https://en.wikipedia.org/wiki/Massive_gravity
What is cosmic background radiation: https://www.universetoday.com/135288/what-is-the-cosmic-microwave-background/
Image I: https://www.nasa.gov/sites/default/files/thumbnails/image/stsci-h-p2001a-m-2000x1500_0.png
Image II: https://en.wikipedia.org/wiki/Cosmic_microwave_background
https://curiosityanddarkmatter.home.blog/2020/11/29/the-massive-gravity-theory/
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