August 4, 2020
photon density; relative mass; relativistic Doppler effect; mass energy equation
By linking photon density to relative mass, this paper presents an alternative to the special relativity theory. The new theory uses only a few intuitive assumptions and reveals the cause and mechanism for relativistic phenomena – the speed of the object alters the average density of the photons and thus changes the relative mass. With this mechanism, the photon density theory discards Lorentz transformation, length contraction and time dilation, and restores the separate universal space and time. Some predictions from the new theory are the same as those from the special relativity theory, such as the unmatchable speed of light, mass increasing with speed, the mass-energy equation, the high-order Doppler effect, and the equivalence of the inertial reference frames; however, the photon density theory suggests that the Doppler effect of light is also asymmetric and that the mass energy equation works only from mass to energy.