AND the term SPACE/TIME was coined by Albert Einstein in his theory of relativity concerning travel at light speed. So if Kishi named these techs Space/Times techs, shouldn't we think they have something to do with light speed travel???
Einstein did not coin the term space-time for gods sake, it's a topological description of the four dimensional manifold that is our universe described by relativity. 3 dimensions are composed of space and 1 of time, hence the four dimensional manifold that is our universe is simply referred to as space-time. That's it, coining a term means that Einstein was inventing a new phrase, when all he was doing was conjoining the existing two sets of (space and time) manifolds into a singular 4-D manifold of our universe in one theory. I'm sorry, but the way you've written it makes him sound like a Carnival guy or salesmen, lol, and I couldn't resist any longer.
As to your question, should we think that Kishimoto knows relativity and travel at light speed for space-time techniques in Naruto?
No, that's utterly ridiculous. He doesn't have a degree in physics that we know of. Not to mention that if he did, he would certainly know Heisenberg's uncertainty principle and the mathematical corollary of Schrodinger's cat, where by Heisenberg's principle one cannot know both an electron's exact position and momentum with absolute information of each, which is required for Kishimoto's FTG and all other space-time techniques in Naruto, including summoning jutsu, etc.
Why people always concentrate on relativity and leave out quantum mechanics I never know, except that they don't know quantum mechanics, lol. That's OK, as I don't expect everyone to know quantum mechanics, as that's pretty unfair, and it's probably not taught as much in the school systems. Further, relativity has been popularized so much that it's been distilled to losing a lot of it's finer technical points (see below).
Kishi has no freaking clue how relativity or quantum mechanics work, just look at how vague the space-time techniques are. I do a S/T jutsu, and I disappear from A and reappear at B thanks to my ninja technique due to hand seals, seals on objects, Tobi's technique, etc. There are no details whatsoever beyond that for the most part. Yes, Minato's seals on his kunai or other tagged objects serve as a beacon for his FTG jutsu, but what the hell does that even mean in terms of physics? I can tell you, as someone who knows physics, it's a bunch of nothing. He didn't say it opens up a wormhole for Minato to find his opponents or something...
Further, space-time techniques wouldn't have to do with accelerating to the speed of light, they would more likely have to do with traveling at a
normal speed but traveling a
shorter distance, hence traveling faster that way (kinda weird I know,

). That's why space-time a 4-D manifold was described, because traversing Cartesian space-time via shortcuts is how FTG would work, not going at the speed of light (no idea how you got that idea, as light would need a discrete vector and is more akin to body flicker if I had to ascribe a technique to it).
While I am at this, I feel you should know Einstein never wrote E=m*c^2 either as it makes certain assumptions, namely that objects are at rest, which is obviously not always the case (thus it fails when they're not). People simply popularized this formulation because it's simple and elegant. He wrote his solution in terms of energy and momentum with corrections for Newton's formulation of momentum (p=mv), so a more complicated/elaborated form of p=m*v and to accommodate for terms not at rest. The elaborated form is too hard to write in this forum format, so see below...
While Wikipedia isn't always a reliable resource, this is a page of relativistic equations, and the ones I looked at appear correct, albeit I only had time to run through some of them. Look at the "
Energy" equations and you'll see the ones you all know and love (i.e. E=mc^2), and while they refer to them as a binomial series expansion a Taylor series is also an appropriate description for anyone who's taken a semester or two of Calculus.
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Peace
Sigh you don't get it , SPACE TIME may move at the speed of light, But the thing that gets tobi and minato , is REACTION TIME....
lightning does not move at the speed of light, but it still Moves freaking fast.... 1000th of a second is no where near slow.... the speed it takes to blink is only around 1/64th of a second...
The reaction time of minato and tobi to use their s/t jutsu, is their downfall....
It's why tobi was hit with amaterasu, he had no time to activate his s/t...its why tobi got hit by minato's rasengan...
unless they see kirin coming from the pre signs ( sasuke raising his hand, thunder roaring etc) , there is no way they are dodging lightning ... no way... im sorry, you can't even blink in the time lightning strikes earth, you cant move a muscle, you cant formulate a thought, nothing
This is one of my favorite posts in a while actually. It's valid in my personal opinion, concise, well written,...., complete.
Honestly, I do wonder if Minato's reflexes are sufficient though given his ability to dodge the Raikage's fastest punch by teleporting out in that flashback. Of course I have no data on how fast the Raikage's punch was moving at.
I also wonder when Itachi activated Susanoo against Sasuke, and how long that takes to activate considering that's what saved him from Kirin and it wasn't complete when it did so.
If Minato has a kunai in his hand, how long does it take him to teleport from the moment he makes the decision as there's a motor delay that I doubt is accounted for by Kishi.
Again, nicely done, +rep
Peace