**Category:**

Research Papers

**Sub-Category:**

Quantum Theory / Particle Physics

**Date Published:**

December 6, 2017

**Keywords:**

Massless , photon, graviton, color charges, magnetic colo

**Abstract:**

At the beginning of the 20th century, by proposing of the relativity and limit speed of light c, the Newton’s second law was corrected considering the limit of speed c and the relativistic mass. After 1906 Einstein have derived the second postulate of special relativity the constancy of the speed of light by assuming that the light quanta that he proposed in 1905 were massless particles.
In standard model the photon is the basic unit of electromagnetism, the quantum of the electromagnetic field and the basic "unit" of all forms of electromagnetic radiation. Having zero rest mass, and traveling always at the speed of light c. In addition, in standard model, fundamental particles are point-like particles.
But in recent years, numerous articles have been published based on empirical evidence which shows the photon has the shape, the upper limit of mass, and the minimum of electric charge which challenges the old approach to the photon. In this paper old and new approaches have reviewed and a new definition of particles relative to their speed has propounded.

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