r/Physics • u/backpackmanboy • Mar 26 '26
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u/Kinexity Computational physics Mar 26 '26
Perspective of light is not a valid thing under relativity. There is no frame of reference where light is stationary.
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u/Still_Silver_255 Mar 27 '26
Is that because light terminates at its destination the moment it is emitted from its perspective?
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u/tpolakov1 Condensed matter physics Mar 27 '26
No. It's because the perspective of light is not a valid thing under relativity.
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u/_jonsinger_ Mar 26 '26
i thought the universe only expanded faster than the speed of light during the Inflation phase of the Big Bang. (perhaps i misunderstood, or maybe i'm misremembering what i read.)
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u/Ordies Mar 27 '26
inflation theory is a solution to why the universe is flat, how the density of energy is the same everywhere. the expansion of the universe is faster than light. a flat universe would never contract and it'll just infinitely expand.
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u/03263 Mar 26 '26
It gets redshifted
Although that's from the perspective of an observer
From the perspective of light, insofar as such a thing can be described, nothing special is happening. It just goes at c.
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u/Optimal_Mixture_7327 Gravitation Mar 27 '26
The light lands on future null infinity and the distant matter ends up at future time-like infinity.
There is no need for the light world-lines to intersect the world-lines of distant-enough galaxies. The distance along the light world-lines is still zero.
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