Negative Mass Electrons, Negative Mass Positrons
and Negative Energy Photons

When Paul Dirac, the Nobel prize-winning physicist was developing the first form of relativistic quantum mechanics he found it necessary to introduce the concept of negative mass electrons. This subsequently led Dirac to develop the idea that a hole in a sea of negative mass electrons corresponded to a positron, otherwise known as an antielectron. Some years later the positron was observed and Dirac won the Nobel prize. 

Subsequent to the above, there appears to have been no experimental search for these negative mass particles. Whether or not negative mass electrons and negative mass positrons exist is thus a question to which we do not yet have an answer. However, if these particles do exist, their unusual properties could be exploited to produce unlimited amounts of energy -- as negative mass electrons and negative mass positrons, when employed in a circuit, produce energy rather than consume it. Newton's 2nd law F = ma becomes F = - ma and that explains why negative mass electrons and negative mass positrons produce energy rather than consume it.  I believe that any good physicist should be able to see this quite quickly.

Also, when one solves Maxwell's equations for propagating electromagnetic photon energy, the solutions allow for negative energy photons as well as the ordinary positive energy photons. Negative energy photons would be given off by negative energy electrons and that would cause circuits to run cool. That is what is seen with the better free energy devices. 

Regarding negative mass electrons and negative mass positrons, Maxwell's equations transform unchanged under energy and charge conjugation. This suggest the possible existence of the aforementioned particles.