I think it can be done. It was Tesla that dealt with e-m waves faster than c.
But then with the coming of Einstein all of that got ignored. Now there is
mental blockage against believing it possible by those who believe in
Einstein's relativity.
On Monday, 13 May 2019, 00:24:12 BST, H LV <[email protected]> wrote:
If one can build a transmitter and a receiver to transmit and detect wave
packets travelling with sub c group velocity why can't one do the same for wave
packets with group velocity much greater than c and achieve communication which
is much faster than c?Harry
On Fri, May 3, 2019, 11:51 PM Axil Axil <[email protected] wrote:
It should be noted that while Einstein's theory of special relativity prevents
(real) mass, energy, or information from traveling faster than the speed of
light c (Lorentz et al. 1952, Brillouin and Sommerfeld 1960, Born and Wolf
1999, Landau and Lifschitz 1997), there is nothing preventing "apparent" motion
faster than c (or, in fact, with negative speeds, implying arrival at a
destination before leaving the origin). For example, the phase velocity and
group velocity of a wave may exceed the speed of light, but in such cases, no
energy or information actually travels faster than c. Experiments showing group
velocities greater than c include that of Wang et al. (2000), who produced a
laser pulse in atomic cesium gas with a group velocity of -310c. In each case,
the observed superluminal propagation is not at odds with causality, and is
instead a consequence of classical interference between its constituent
frequency components in a region of anomalous dispersion (Wang et al. 2000).
Keith Fredericks has an opinion that strange radiation is a tachyon. This SR
quasiparticle might be tachyonic is that it is most likely based on the
polariton. The polariton does generate superluminal light in the form of
x-waves.
https://www.nature.com/articles/lsa2017119
Superluminal X-waves in a polariton quantum fluid
This article shows that a polariton can naturally produce superluminal light
(X-waves) when excited with a pulsed laser.
This unexpected behavior of light may explain how Strange radiation (SR) can be
considered a tachyon, a superluminal particle.
