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{{short description|Speculative feature of the early universe}}
{{Technical|date= {{distinguish|text=[[String (physics)|string]] in [[string theory]]}} '''Cosmic strings''' are hypothetical 1-dimensional [[topological defect]]s which may have formed during a [[Symmetry breaking|symmetry-breaking]] [[phase transition]] in the early universe when the [[topology]] of the [[Vacuum state|vacuum]] manifold associated to this symmetry breaking was not [[Simply connected space|simply connected]]. It is expected that at least one string per [[Hubble volume]] is formed. Their existence was first contemplated by the theoretical physicist [[Tom Kibble]] in the 1970s.<ref name="Kibble 1976">{{cite journal |doi=10.1088/0305-4470/9/8/029 |title=Topology of cosmic domains and strings |year=1976 |last1=Kibble |first1=Tom W K |journal= Journal of Physics A: Mathematical and General |volume=9 |issue=8 |pages=1387–1398 |bibcode=1976JPhA....9.1387K }}</ref>
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