Generalization of the Dirac’s Equation and Sea

Newton's second law is motion equation in classic mechanics that does not say anything about the nature of force. The equivalent formulations and their extensions such as Lagrangian and Hamiltonian do not explain about mechanism of converting Potential energy to Kinetic energy and Vice versa. In quantum mechanics, Schrodinger equation is similar to Newton's second law in classic mechanics. Quantum mechanics is also extension of Newtonian mechanics to atomic and subatomic scales and relativistic mechanics is extension of Newtonian mechanics to high velocities near to velocity of light too. Schrodinger equation is not a relativistic equation, because it is not invariant under Lorentz transformations. Dirac expanded The Schrodinger equation by presenting Dirac Sea and founded relativistic quantum mechanics.
In this paper by reconsidering the Dirac Sea and his equation, the structure of photon is investigated and it is made an attempt to answer these following questions:
1- What is the relation between photon and its electromagnetic fields?
2- Does force have physical existence or it is just a mathematical tool to describe physical interactions?
3- What is the mechanism of converting potential energy to kinetic energy and vice versa?
4-What is the relation between gravity and electromagnetics?
5-What is the relation between Weyl fermions and Dirac fermions?