The String Theory

Elementary particles called quarks, electrons, photons, neutrinos are scattered in the expanding space. The same amount of material and antimatter particles collide and begin to destroy each other. Gravity, weak nuclear power, electromagnetic force work quickly. When the universe begins to cool down, elementary particles called quarks start to crush and form protons and neutrons. Next, they combine to form a core of simple elements starting with hydrogen, helium, and lithium.

String theory in elementary particle physics is a theory trying to combine quantum mechanics with general relativity of Albert Einstein. Name string theory comes from the modeling of elementary particles as a small one - dimensional "code - like" entity, not a traditional way of modeling primitive particles as zero - dimensional point particles. The theory assumes that strings experiencing a particular vibration mode correspond to particles having specific properties such as mass and charge. In the 1980's, physicists noticed that string theory could combine all four natural forces - gravity, electromagnetic force, weakness - and all kinds of matter in the framework of quantum mechanics. - Unified Field Theory

In 1984's first superstring revolution, many physicists changed string theory to particle physics and unified theory of quantum gravity. Unlike the supergravity theory, string theory can adapt to the chirality of the standard model and can provide a gravity theory consistent with the quantum effect. Another characteristic of the string theory that many physicists were fascinated in the 1980s and 1990s is its high degree of uniqueness. In ordinary particle theory one can consider any set of elementary particles whose classical behavior is described by any Lagrangian matrix. In string theory, the possibilities are more limited. By the 1990's, physicists believed in theory that there were only 5 supersymmetric versions in theory.