# What is the string theory? How is it related to space time?

*String-Theory* is the theory that replace the particles(atoms, electrons, photons) to *vibrating strings*.

Two published physics frameworks emerged in the early 1900s:

The problem comes when we try to reconcile Quantum Mechanics with Theory of Relativity because of Gravity. Both of these theories attempt to explain the established laws of Physics that we use today.

String Theory is a member of Theory of Everything because it attempts to address this issue by substituting strings for particles.

The string is a vibrating string that vibrates in all possible ways, and on large scale distances, it has normal properties like mass, charge, etc.

Quantum Field Theory is the study of the electromagnetic field in space-time. Since quantum mechanics relies on probabilities, perturbation theory can be used to calculate the electromagnetic field.

A consistent quantum theory in this case requires that the curved space in which the string travels be a solution to the Einstein equations. If a closed string is traveling in a curved space-time, then the coordinates of the string in spacetime feel this curvature as the string propagates. The answer lies on the string worldsheet or stringy space-time.

Not only does string theory predict the graviton—a hypothetical gravitational force carrier—from flat spacetime physics alone, but it also predicts that a curved spacetime in which strings propagate will obey Einstein's equation, which was a highly persuasive result for proponents of string theory. (Credit)

The challenge facing string theory is that it has not yet been discovered experimentally. If successful, results could allow us to reconcile quantum mechanics and gravity.

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In an attempt to reconcile the ideas of general relativity and quantum mechanics, string theory is a theoretical framework in physics that holds that the fundamental particles of the universe are one-dimensional "strings" rather than point particles. Space-time is not fundamental in string theory; rather, it arises from the interactions of these strings.

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