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At least the definition should be sourced. The statement 'first studied in the late 1960s' should also be sourced, with either the papers or someone's timeline summary. The trailing paragraph on challenges and criticism should be especially well sourced. Almost every sentence there deserves one or multiple citations. Tag: Reverted |
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{{seeintro|Introduction to M-theory}}
{{String theory}}
{{Unreferenced section|date=February 2024}}<!--
At least the definition should be sourced.
The statement 'first studied in the late 1960s' should also be sourced, with either the papers or someone's timeline summary.
The trailing paragraph on challenges and criticism should be especially well sourced. Almost every sentence there deserves one or multiple citations.
-->
In [[physics]], '''string theory''' is a [[Mathematical theory|theoretical framework]] in which the [[Point particle|point-like particles]] of [[particle physics]] are replaced by [[Dimension (mathematics and physics)|one-dimensional]] objects called [[String (physics)|strings]]. String theory describes how these strings propagate through space and interact with each other. On distance scales larger than the string scale, a string looks just like an ordinary particle, with its [[mass]], [[charge (physics)|charge]], and other properties determined by the [[vibration]]al state of the string. In string theory, one of the many vibrational states of the string corresponds to the [[graviton]], a [[quantum mechanics|quantum mechanical]] particle that carries the [[gravity|gravitational force]]. Thus, string theory is a theory of [[quantum gravity]].
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