You seem to equate 'big bang stuff' to material or energy, but since the universe is 3D, that spreads out according to an inverse cube law. When the universe expands to double its size, the density of most stuff (not dark energy) drops to 1/8 the prior value. This is presuming that energy is conserved in an expanding frame, which it isn't, but for mass, it sort of works.Will Bouwman wrote: ↑Tue Nov 19, 2024 2:23 pm One strand of the story is that big bang stuff is still spreading according to an inverse square law
Those are the same thing with the same units. Work is a specific type of energy is all. Your boat/water wave analogy doesn't work since light does not behave like water. Do the math. The total energy of a pulse of light is frame dependent. In a redshifted frame, sure the pulse duration is twice as long, but the longer wavelength carries half the energy, and the intensity is also half (one plus, two minuses). It's easier to figure if you work with quanta since the duration makes no difference and all that is left is the lower frequency (no plus, one minus).I'm mixing up work and energy.
Indeed. As I said, one can make the energy of a photon anything you want by choosing the correct frame. Running is unnecessary.As I understand it, the expansion of space literally stretches photons, but there's nothing to stop us running towards them to increase their energy.
The internet is so full of talk about the frame of light, and it's all wrong, but there's enough of it that the chatbots learn it and spit back rubbish. That's one of the main audiences I'm concerned about. I'm trying to do my part to stamp it out where it is seen. Sure, Einstein, back in the 1890's, considered the frame of light, and hit so many contradictions that he knew a new theory was needed. Nowhere in the SR paper is such a frame described.Ok. So did I not make my case and give the impression that light is a valid frame?
"If you travel in space and time, then it takes longer to reach the same 'time'"It's not a quote, I'm just trying to convey the gist of relativity in language most non physicists will be comfortable with.
This seems to be false in any frame. In any frame, it takes an hour to reach an hour from now.
If you looking at it from a dilation perspective, the moving guy sees less time, not more, to get to an hour from now.
I just think it would be far less confusing to the non-physicists
For one thing, one does not travel through spacetime. One traces a worldline through spacetime, but is everywhere present anywhere on that worldline, so it isn't travel. One travels through space. That's what travel means, making it a frame dependent concept.
A more correct statement would be "If you travel in space, then it takes less proper time than coordinate time to reach a given destination", but then one must define proper and coordinate time for your audience.
It is fingernails since if your story actually piques an interest in physics to anybody enough for them to take up the study (or even to get through the mandatory physics pre-req to a college non-physics degree), then it would be a shame if the first steps are to unlearn all the wrong definitions. OK, yes, physics was mandatory for my non-physics engineering degree, but relativity was never part of that prereq. They only teach that if you want it.It was a stylistic decision not to define words as physicists understand them, since it is not my intention to teach physics to physicists. I know that is fingernails on a chalkboard to some, but again, it's just a story to create a context that some might find helpful.
Group contributing to a similar topic on another science (not philosphy) forum, one in which I'm a moderator. No, that is not said to bolster my credentials since there's plenty that blow me away with their knowledge of various subjects on hard-core sites like physicsforums (where I'm just a contributor) or especially physics stack exchange where I don't even have an account. But they're my go-to site for answers to hard questions. Site for the worst answers is perhaps Quora.Probably because the algorithms don't adequately distinguish between people who do and don't know what they are talking about. Who is "we", by the way?