B Is Light Traveling Through Time?

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    Light Time Travel
Physicsislifetome
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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
 
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...
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...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)... Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/ by @robphy

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