Who knows a lot about x waves and the ftl nature?

[escortsxxx]

X waves

the infinite family of exact superluminal solutions of the Maxwell equations are waves known as X-waves (Rodrigues and Lu 1997). Scalar X-waves have been measured experimentally by Lu and Greenleaf (1992), and subsequently by Lu, who showed that the peak of a finite aperture approximation to an acoustical X-wave can travel with speed greater than the sound speed parameter appearing in the homogeneous wave equation (Rodrigues and Lu 1997). Rodrigues and Lu (1997) also performed several simulations for the propagation of X-waves, showing that their peaks can move with superluminal speed, an effect subsequently verified by Saari and Reivelt (1997).

These results do not violate special relativity because all the produced superluminal X-waves have wavefronts that travel with the speed parameter c (the speed of light) that appears in the corresponding wave equation. The superluminal motion of the peak is therefore a transitory phenomenon similar to the reshaping phenomenon that occurs (under very special conditions) for waves in dispersive media with absorption or gain and which is in this case responsible for superluminal (or even negative) group velocities (Maiorino and Rodrigues 1999).


Confused about ftl peak and negative v.

 

[JohnHenry]

Sheldon.

 

[escortsxxx]

Sheldon.

lol

 

[xix]

Funny you post this @escortsxxx because I am searching for info for something like this and you made it easy for me. Thanks very much.

Now all I am missing is Y -wave and once I find the info I can apply it to my spaceship.

 

[escortsxxx]

Funny you post this @escortsxxx because I am searching for info for something like this and you made it easy for me. Thanks very much.

Now all I am missing is Y -wave and once I find the info I can apply it to my spaceship.

Plane wave solutions travel at the speed of sound s where s2 = Y/p. This wave equation does not allow any causal effect to propagate faster than s.

KT McDonald — The speed of the sum of two electromagnetic plane waves, each of which propagates with ... (y = a/2) = 0. Then, the fields are given by the real parts


Lol
you're referring to the relationship between wave speed, material properties, and causality in wave propagation. The expression denotes the relationship between the speed of sound Young's modulus and density in a material. This equation implies that the speed at which a disturbance travels through a medium depends on the material's stiffness (Young's modulus) and density.

Regarding the quote by KT McDonald about electromagnetic waves and their fields, it's probably indicating the superposition principle, where the resultant fields due to the sum of two waves (each with an amplitude of ?) are obtained by taking the real parts of the complex representation of those waves.

Very funny.

 

[escortsxxx]

You're welcome