A new theory on the shape of the universe and the origin of the time

According to the First Newton Law, when a physical system is not under the influence of any force, it moves linearly and its speed remains constant. This law is crucial because we know that the force is the cause of the movement. So, how can a physical body move without any force? The explanation is found in the mass of the system. According to the General Relativity, the masse is the condensation of much energy. The energy of mass is given by the equation E = mc². Behind this mass or this energy, there is the force of mass. In our paper, we called this force, the internal force. The internal force is the force of mass in comparison to the internal energy. So, this force is the cause of movement when no force is exercising on a physical system. We know that the photon has a constant maximum speed. We can also consider a single photon as the particle with the lowest energy or the lowest mass. So, it comes an evidence that when a physical system has a low mass, its speed is high; and when its mass is great, its speed is low. This evidence leads us to this conclusion: if we consider two systems or more, when no force is exercising to them, the momentum (masse*speed) is conversed from one system to another. The value of the speed calculated by this way represents the absolute speed. The absolute speed is the speed of the physical body by referring to the light viewpoint. By this manner, we discovered that like the speed of light is always constant, its energy (or its mass) also cannot be changed. Certainly, its internal force is also invariant. We have concluded that not only celerity but all physical characteristics (speed, energy, mass, force) of the photon are invariants. In our article, A new theory on the shape of the universe and the origin of the time (doi:10.29328/journal.ijpra.1001042), we have defined the values of the physical characteristics of photon (energy, mass, force).