Nanda Ballabh Pant(BAIJNATH, India):
It is a superb and comparative consolidation of many phenomena in one article. However, in case of
light to explain Doppler effect one states that with motion frequency and wavelength of observed light changes so (and therefore change in signal color) that the velocity of light remains unchanged. But in contrast to this there is doubly special relativity (D Harris: After Einstein, New Scientist8 February 2003) according to which velocity of light depends on the energy of its quantum that ishigher the energy of light quantum more is its speed in comparison low energy photon. However, this difference is too small to be detected experimentally. To translate this into reality one is looking for
Greisen-Zatsepin -Kuzmin limit according to which if special relativity is correct than on the earth,
there should not be any cosmic ray particles left with higher energies than 5×1019 electron volts and vice versa. However, cosmological observations are also not free from ambiguity. The possibility of tachyons existence as well as formation of a black hole is ruled out if one considers the velocity of light is constant as statistical measure, because if one wants to measure the velocity of single photon (light quantum) ; according to uncertainty relation one cannot measure that precisely for particular instant. As R P Feynman et al ( R. P. Feynman, QED: The strange theory of light and matter, 1985) says “It may surprise you that there is an amplitude for a photon to go at speeds faster or slower than the conventional speed, c, but these amplitudes cancel out over long distances.” The very fundamental question is what does resist to the velocity of light to be it the limiting (invariant) speed of fastest signals even in the vacuum? Answer lies itself in the milieu of the vacuum (fabric of space-time) which by resisting least to the light quanta as per their energies provides terminal velocity to those as the fastest possible traveling signals. Thus the background (here the milieu of the vacuum which is better defined as the state of lowest energy with a nonzero value) has its role not only to the material particles but also to the light quanta.
Posted: May 12, 2013 @ 1:24:33 am