B Is Light Traveling Through Time?

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    Light Time Travel
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If we need light speed to travel in time and light already have it , so is light traveling in time
 
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I don't know what you mean by "travel in time", but light takes time to move from one point to another.
 
Maybe he's thinking light speed allows time travel, so is asking if light engages in time travel.

Saying "it takes time to move from one point to another" may apply to Bob, who will say it takes him some time to go from home to work (taking time being his experience), and Bob may notice that his clock shows the passage of time when he notes the emission and absorption of light as the light apparently needs some duration by Bob's measurement to move from one point to another... but that is Bob's time. Isn't the current thought that since there is no inertial reference frame where light goes less than light speed c it is not just that light's delta t=0 but that it is null? That there is no sense of time that can be applied to the light itself?
 
bahamagreen said:
Maybe he's thinking

Maybe we should let him tell us rather than guess.
 
Vanadium 50 said:
Maybe we should let him tell us rather than guess.
Bahamagreen is right
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
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Thread '1-Way Speed of Light'

Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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Thread 'A sufficient condition for integrability of equation ##\nabla g=0##'

In Philippe G. Ciarlet's book 'An introduction to differential geometry', He gives the integrability conditions of the differential equations like this: $$ \partial_{i} F_{lj}=L^p_{ij} F_{lp},\,\,\,F_{ij}(x_0)=F^0_{ij}. $$ The integrability conditions for the existence of a global solution ##F_{lj}## is: $$ R^i_{jkl}\equiv\partial_k L^i_{jl}-\partial_l L^i_{jk}+L^h_{jl} L^i_{hk}-L^h_{jk} L^i_{hl}=0 $$ Then from the equation: $$\nabla_b e_a= \Gamma^c_{ab} e_c$$ Using cartesian basis ## e_I...
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