Searching for the Gravific Photons

It was show that the linear momentum transported by electromagnetic waves has a negative component, in such way that, when a radiation incides on a surface, it is exerted a pressure on opposite direction to the direction of propagation of the radiation. In addition, it was predicted the existence of photons in which the negative component of the momentum is greater than the positive one. These photons were called attractive photons or gravific photons. Here, we show how to produce and to detect this type of photons.