Could Laser Beam Shifting Enable Faster-Than-Light Communication?

Gaz1982
Messages
64
Reaction score
0
OK, just had a thought. And I would be grateful if someone could explain why this couldn't work:Place A is on a surface

Place B in on the same surface but, say 10,000 miles away from Place A. Therefore communication between them is limited the speed of light .

But what if, at Place A there was a laser constantly projecting a beam to Place C - which for arguments' sake is 1000 miles above the surface and equal distance between Places A and B.

The laser's beam is by default fixed onto Place C Box 1, but at a time of asking the laser is quickly moved to shine on Place C Box 2. At this point a similar such laser which contently fires from Place C Box 2, then moves very quickly from shining at Place B box 1 (back down on the surface) to Place B Box 2

In effect, Place A has "informed" Place B of a change in status quicker than the time it takes light to travel in-between Places A and B in a conventional method, as the lasers were already on and shining, they just needed their angle adjusting a fraction.

This is based on the principle that lights and shadows can of course cross a distant object faster than the speed of light without violating Relativity.

If the lasers I quoted were always on, and just needed to move slightly, and the boxes be automated to do something when light hits them, could this then = de facto FTL communication?
 
Physics news on Phys.org
When the laser at A is shifted, the effect will not be seen at place C until a speed of light delay has elapsed. Place C, box 1 will remain illuminated for some time (about 26 milliseconds in this case) while light sent earlier from point A is still coming in, even though the laser at point A is already pointing at box 2.
 
jbriggs444 said:
When the laser at A is shifted, the effect will not be seen at place C until a speed of light delay has elapsed. Place C, box 1 will remain illuminated for some time (about 26 milliseconds in this case) while light sent earlier from point A is still coming in, even though the laser at point A is already pointing at box 2.
Of course!

Thank you!

I'll put my Nobel prize celebrations on hold for a while
 
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...
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...
According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
Back
Top