Can the speed of information dissemination exceed the speed of light?
Chuyi Wan
Abstract
In the double-slit interference experiment with light, once one of the slits is instantaneously closed, the point H on the screen directly opposite the other slit will experience a change in the intensity of light at that point. Moreover, the time it takes for the intensity of light at point H to change after the slit is closed is shorter than the time it takes for light from the slit to reach point H. This indicates that information is transmitted from the slit to point H on the screen at a speed faster than the speed of light c. This does not violate Relativity, as it does not conflict with the Principle of Constancy of Light Velocity. Information is transmitted at varying speeds within the wave packet. In the direction parallel to the propagation of the photons, the speed of information transmission matches c. However, in other directions, the speed of information transmission can exceed c. And according to the inference, it appears that causality is not an immutable law of nature. Causality is not easily overturned at the macro level, while it is not so at the quantum level. The law of causality varies under different inertial or non-inertial reference frames. In one reference frame, the cause leads to the result; in another reference frame, the result may leads back to the cause. Cause and result are mutually causal in different reference frames.