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@TheGreatSunGod
That is truly impeccable logic. Sound to the core.
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@TheGreatSunGod
The key word there is
Some
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@ebuc
I would argue **there is no true vacuum** of Universe, as all space is composed of various kinds fields, that, of mass --if not others--- that the photon cannot escape interfering with in Universe. Photons { EM field } do go slower when interfreing with other fields. Ex Higgs field as mentioned. And HIggs specifically involves the mass of fermions, if not some or all bosonic forces.
I think you are misunderstanding the concept of a field and a photon 'travelling'. A photon is a quantized unit of the electromagnetic field(s). The only field they interact with is the electromagnetic field directly and are not affected directly by the Higgs field hence/if they have no mass. Photons are discrete pertubations in the em field if you will. The em field 'works' at the speed of causality. Ergo the speed at which photons propogate is the speed at which the em field is willing to propogate them which is the speed of causality.
As for photons moving slower when interacting that is only sort of true. Yes they don't 'move' whilst they interact with a charged particle but the interaction itself happens at the speed of causality. Eg. in material you have electromagnetic waves that interact with the material in mind through various mechanisms (e.g. phonons, electrons etc.) to eventually become phase shifted by some amount 'moved backwards' which then makes it look as though they were 'travelling slower' but actually the pertubations in the field (not the field itself) is still moving at the speed of causality but it changes direction a couple of times whilst it interacts with itself and the other fields indirectly through the pertubations made by charged particles. The photon itself is just a quantized element of the em field and so if you truly want to get what a photon actually is study qft.
But intuitively speaking this is the understanding. So how about einstein? The video says if photons could travel slower than the speed of causality then... so if pertubations in a field move slower than at the speed of the causality at which the field works... You see the problem here? The proposition literally does not make sense. Now another way to think about it is this: the lorentz contraction sqrt(1-(u2/c2)) is 0 at the speed of light so all length become contracted to 0, so velocity from the photons perspective is 0, so acc is 0, so if it had a mass then in the photons frame of reference compared to ours you literally cannot make it acc no matter the force, so it cannot have mass (the resisting of acc) other than infinity or 0. But as soon as it moves slower you have non 0 length so non 0 vel so ... it can be affected by a force to make it acc so it has mass. That is what is meant in terms of the einstein expl. I think.
Any qs or objections pls ask or object.
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@TheGreatSunGod
Anime lured me in with its cuddly cute girls and now I cant stop watching it.
So you are suggesting that you found the girls attractive in some way, which is what got you hooked, but when it comes to other fan service its apparently too much? There is safe anime and there is not safe anime. Anime caters to a wide audience and the fact that you find some anime appalling just means you are not in the target audience. Are you going to say that Solo-levelling (the anime) is unsafe or a better example yet 'The unwanted undead'?
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