Answer to Question #13397 in Electricity and Magnetism for Bruce Patterson

Question

I wonder about the following: if time actually is the dimension of sequence then energy moving at the speed of light would take a certain amount of time to travel the distance of one Plank. That amount of time is the smallest increment of time/sequence possible and is the reason that the speed of light is what it is. Time will not allow a faster speed--it cannot be sequenced.
So then--my question--does this simplistic logic merit further contemplation on my part?
Thank you
Bruce Patterson

Answer 1

https://en.wikipedia.org/wiki/Planck_units
https://en.wikipedia.org/wiki/Planck_time

from this point of view, all particles can not move faster then light.
BUT! from special relativity. delta tau = delta t * sqrt{1-V^2/c^2} - well known formula, when V=c, delta tau=0.

https://en.wikipedia.org/wiki/Tachyon

At this moment we didn't find tachyons, so we think that speed of light is maximum, but if we will find them => Planks distance is nor the smallest, and in fact our Universe (space) is not discrete