Why there are only four fundamental forces: a possible explanation

It is known that there are exactly four fundamental forces of nature: gravity forces, forces corresponding to weak interactions, electromagnetic forces, and forces corresponding to strong interactions. In this paper, we provide a possible explanation of why there are exactly four fundamental forces: namely, we relate this number with the dimension of physical space-time. 1 Formulation of the Problem Fundamental forces of nature: a brief reminder. According to modern physics (see, e.g., [1, 2]), there are four fundamental forces that describes our Universe. Here the forces are listed in the increasing order of their strength: • gravity forces, • forces corresponding to weak interactions, • electromagnetic forces, and • forces corresponding to strong interactions. Let us briefly remind the readers what are these forces: • Everyone knows what gravity and electromagnetism are. • Strong forces are the ones that keep protons and neutrons in the atoms’ nuclei. Without the strong forces, protons in a nucleus would fly away – they have the same charge, so electromagnetic charges will move them apart. • Weak forces are responsible for other processes inside the nucleus, such as beta-decay, when a neutron decays into a proton, a positron, and an anti-neutrino.