Quantum mechanics Quote by Henning Genz

““The parameter we hold responsible for the ability or inability of a particle to move with a velocity other than that of light is its mass. When the mass is zero, such as that of a real photon, the particle has to move with the velocity of light at all times; for finite masses, its velocity can take any value below the velocity of light, and can also be zero. We saw that quantum mechanics treats light as a current of mass-zero particles called photons, which have to move with the greatest possible velocity across space. That space, real space, contains the pervasive Higgs field. The photon is one of the particles-it might even be the only one!-that does not interact with the Higgs field and can therefore move in this field without being slowed down. We might redefine the influence of the Higgs field on the velocities of the particles it interacts with in the following way: The Higgs field imparts effective masses to the particles-which, above the critical temperature of 10^15 degrees, are massless like the photon.””

— Henning Genz