Recent content by sunroof

OP is correct that Abraham–Minkowski controversy is not on technical matters. In fact, it is helpful to extend the theory of relativity,e.g. Ravndal, F., Electromagnetism and photons in continuous media, arXiv:0810.1872 Crenshaw, M.E., Electrodynamics in a Filled Minkowski Spacetime with...

Yes. So I think Minkowski momentum is reasonable and Abraham is incorrect.

There also have experiments with a high credibility to support Minkowski momentum,e.g. Campbell, G.K., Leanhardt, A.E., Mun, J., et al, "Photon Recoil Momentum in Dispersive Media", Physical Review Letters. Vol94, issue 17, 2005, pp.170403 Wang Zhong-Yue, Wang Pin-Yu, Xu Yan-Rong (2011)...

Time does not depend on light. Space and time depends on substance whose parameters can be light speed c in vacuum(theory of relativity), c/n in media (Wiki_Abraham–Minkowski controversy), Fermi velocity of condensed matter physics(graphene, "Einstein's Relativity Theory Proven With The 'Lead'...

It is resolved in a paper "Graphene,neutrino mass and oscillation". The gravitational shift df or sound waves in air on the surface of the Earth is f.dr/R (f is frequency, dr is height difference and R=6,400km is radius of the earth.) The result is dissimilar to that of light because the...

:rolleyes: But how to explain electric energy can be sent to users miles away by copper wires whose frequency is very low(60Hz or 50Hz) in power industry?

Yes. A superluminal phase velocity vp>c is corresponding to a signal velocity vs less than c because vpvs = c2. However, a subluminal phase velocity vp<c might represent vs>c. See http://en.wikipedia.org/wiki/Phase_velocity

The speed of charge(electron) has nothing to do with that of the electromagnetic field. It is much slower than the latter. (Wiki: http://en.wikipedia.org/wiki/Drift_velocity )

It is just to simplify the problem. The difference between the dielectric constant and magnetic permeability of media and vacuum reflects the interaction. The consequence is that the light speed u is changed because it depends on these two parameters. So, we can treat photons in media as free...

_This is metaphysics. In the advanced form of special relativity, the invariable speed should be introduced according to the group theory. But the theory cannot limit the number and value of the invariable speeds at all. They are only determined by experiments. The light speed in vacuum...

In the theory of specific heat capacity, the energy is E=hf and the momentum of a phonon is p=hk (k=1/wavelength). E/p=f/k=c'(velocity of a phonon) and c' is much less than the light speed c in vacuum.

I will use two examples to disprove. In classical electrodynamics, energy density of an electromagnetic field (photons) is w=dielectric constant times squared electric field intensity and momentum density is g=dielectric constant times electric field intensity times magnetic induction...

You're right that mass-energy equivalence is related to the Lorentz transformation. But whether the transformation is tenable in media? If the Lorentz transformation is universal, the consequential Doppler effect should always depend on the relative velocity V,angle and light speed c, no matter...

Thanks very much for your advice. I considered this interpretation long ago and gave up. Substituting E=hf and p=h/wavelength into the relativistic E=sqrt((squared pc)+(squared rest mass c^2)) will lead to a negative squared rest mass, i.e.the effective rest mass is imaginary.This is unreasonable.

In electrodynamics, the energy-mass relation of an electromagnetic field (photons) is related to media. The Poynthing vector S =energy density times velocity and momentum density g=mass density times velocity. Therefore, S/g=energy density/mass density=energy/mass=E/m. On the other hand...