Yes, relatively means that light appears to move at c in every inertial reference frame. That doesn’t change how we measure distance in a single reference frame.
How can a metre bar be measured as a metre when it’s one unit and two units long? We’re measuring the bar in it’s own reference frame each time, so relatively causes no change. Either c increased, or time slowed down to match the expansion of space. Either way, light doesn’t get redshifted by expansion.
Help me understand, how does light appear to change speed over time in the same reference frame? How do we see a change of distance affect light between galaxies, but not between atoms?
The reason the speed of light doesn change is because rthe universe bends the rules of time to make it the same. So as the universe expands, the speed of light stays the same because the definition of time changes.
Like I said. The expansion of the universe isn’t space expanding, it’s the definition of distance that’s expanding. Yes time is being fucked with as part of the expansion. But the universe doesn’t hold distance or time as constant frames to compare to. As speed is only calculated with a frame of reference. Where distance is a little more fundamental to the universe.
Because the scale is so so much less. Like 73 km/s/Mpc.
So the rate of something to the scale of 10^-9m, would be somewhere in the order of 10^-25m/s. Which is much much smaller than anything with the attoms itself.
But the distance is always the same. A meter is still a meter in all points of time. But it’s still bigger.
And yet you said that a metre bar would be larger yet measure the same. If all the aspects of the universe are expanding in lockstep such that any distance appears constant, then redshift caused by expansion is impossible.
If the increasing distance between atoms is unmeasurable, then so too must be the increasing distance between galaxies be undetectable.
LIGO can detect changes of distance on the order of 10⁻²¹, and it should be increasing in effective length by 2×10⁻¹²m/s, yet I don’t see any mention of any large interferometer measuring anything but gravitational waves, and I don’t see any large time-dependent components of LIGOs systemic error data.
We also can measure the increasing distance of galaxies via redshift, so unless you can explain how light from galaxies is different from the light in a large interferometer, I must conclude that the interferometers aren’t expanding at the same rate as the observed expansion of the universe.
We aren’t expanding like the universe is expanding.
We can still measure the red/blue shift to find the star, but if you don’t correct for it, it will be wrong.
Also I don’t know enough about gravitational waves wo know how it would be effected by the expansion of the universe.
But remember when LIGO measures, it’s not measuring absolute values that we would see drift in. It’s all relative measurements from a short time period prior. It would follow in lockstep with the expansion.
Also gravitational waves arent particles. They’re disturbances in the fabric of the universe. So they don’t behave like standard waves do. They have their own wave mechanics that I haven’t studied.
And light is having its wavelength stretched. Speed of is not proportional to frequency in a vacuum only the permittivity and permeability of free space. So it’s wavelength is getting expanded without
But again. Space isn’t expanding. Distance is.
Also that’s not how informeters work.
They compare distance across two lines. They can only detect the differences between those lines. Because expansion is universal in all directions, it’s not detectable on informeters.
