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Fundamental interactions, also known as fundamental forces or interactive forces, are the interactions in physical systems that don't appear to be reducible to basic interactions. There are four conventionally accepted fundamental interactions—gravitational, electromagnetic, strong nuclear, and weak nuclear. Each one is understood as the dynamics of a field. The gravitational force is modeled as a continuous classical field. The other three are modeled as a discrete quantum field, and exhibit a measurable unit or elementary particle.

Gravitation and electromagnetism act over a potentially infinite distance—across the universe. They mediate everyday macroscopic phenomena. The other two fields act over minuscule, subatomic distances. The strong interaction is responsible for the binding of atomic nuclei. The weak interaction also acts on the nucleus, mediating radioactive decay.

Theoretical physicists working beyond the Standard Model seek to quantize the gravitational field toward predictions that particle physicists can experimentally confirm, thus yielding acceptance to a theory of quantum gravity (QG). (Phenomena suitable to model as a fifth force—perhaps an added gravitational effect—remain widely disputed). Other theorists seek to unite the electroweak and strong fields within a Grand Unified Theory (GUT). While all four fundamental interactions are widely thought to align at an extremely minuscule scale, particle accelerators cannot produce the massive energy levels required to experimentally probe at that Planck scale (which would experimentally confirm such theories). Yet some theories, such as the string theory, seek both QG and GUT within one framework, unifying all four fundamental interactions along with mass production within a theory of everything (ToE).


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