It is known that topological defects might appear only during phase transitions of the first kind, while continuous transitions of the second kind and crossovers don't product them. How to explain that?

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    $\begingroup$ Not sure where you got that wild claim. KT transition is driven by proliferation of topological defects, and it is a continuous transition. $\endgroup$ – Meng Cheng Jul 17 '15 at 19:56
  • $\begingroup$ @MengCheng : maybe my question have to be rephrased by the next way: why Kibble mechanism of formation of topological defects during phase transitions isn't relevant for the second order transition for cosmology? $\endgroup$ – Name YYY Jul 17 '15 at 21:13
  • $\begingroup$ @MengCheng : may I ask you about KT transition? $\endgroup$ – Name YYY Jul 22 '15 at 11:28

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