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( String theory)
Type I string ยท Type II string
Heterotic string
String field theory
Holographic principle Since its birth as the dual resonance model which described the strongly interacting hadrons as strings, the term string theory has changed to include any of a group of related superstring theories which unite them. One shared property of all these theories is the holographic principle. String theory itself consists of many theories with different mathematical formulas. The logical coherence of the approach, however, and the fact that string theory can include all older theories of physics, have led many physicists to believe that such a connection is possible. In particular, string theory is the first candidate for the theory of everything, a way to describe all the known natural forces (gravitational, electromagnetic, weak and strong) and matter (quarks and leptons) in a mathematically complete system. On the other hand, many detractors criticise string theory because it has not yet provided experimentally testable predictions. Like any other quantum theory of gravity, it is widely believed that testing the theory experimentally would be prohibitively expensive, requiring feats of engineering on a solar-system scale. Although some critics concede that string theory is falsifiable in principle, they maintain that it is unfalsifiable for the foreseeable future, and so should not be called science. String theory is of interest to many physicists because of the mathematics involved, and because of the large number of forms that the theories can take. String theory strongly suggests that spacetime has eleven dimensions,[1] as opposed to the usual three space and one time, but the theory can easily describe universes with four observable spacetime dimensions as well.[2]
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