Recent content by Huang XingBin

Principles of Optics - Born Wolf, page 794, after Eq.(6): We must distinguish between the phase velocity and the velocity of energy transport. The former, the phase velocity, is in the direction of the unit vector s……. (i.e., the direction of wave vector k) Gjurchinovski’s velocity u is...

Yes, but I don't see how Gjurchinovski redefine the wave vector in his paper. I see that he give a new velocity, the new velocity u of plane waves is only described as the velocity of the profile of plane waves. From his new velocity, he has gotten the conclusion contradicted with the definition...

Principles of Optics - Born Wolf, page 17, after Eq.(19): "It is also convenient to define vectors k_0 and k in the direction s of propagation,... ...... The vector k= ks is called the wave vector or the propagation vector in the medium,..." From above definition of the k, we know that...

I have submitted my paper to Europhysics Letters and pointed out their mistake, but Europhysics Letters have refused to correct the error. Therefore we cannot easily believe the paper published in Europhysics Letters. Europhysics Letters may not be a true science journal.

From the definition of a plane wave, direction of k is the direction of the wave surface (i.e., plane) moving, and direction of u is also the direction of the wave surface moving, it should be stressed here that the u is the phase velocity. Hence, the directions of k and u must be the same. How...

Thank you for your message, but, I think in the case of "superluminal" motion of the medium, k dot u becomes negative is not correct. If this conclusion is true, then the directions of k and u (In exceptional case of "superluminal" motion of the medium, u is the phase speed) point in opposite...

I think Gjurchinovski's conclusion is questionable. The reason is that in order to let the frequency changes from negative value to positive value, the direction of the wave vector and the direction of the wave surfaces transport (i.e., the phase speed) point in opposite directions in the case...

Study on the invariance of the phase of plane waves Abstract. In recent study, the invariance of the phase of plane light waves among inertial frames is challenged by a counter-example where the four-vector (k, ω/c) of plane waves is exceptionally not Lorentz-covariant. A new argument that...