Are topological defects such as domain walls really discontinuous?

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SUMMARY

Topological defects, such as domain walls and cosmic strings, exhibit properties that challenge the binary notion of discontinuity. Domain walls serve as two-dimensional boundaries between regions of distinct symmetry breaking, while cosmic strings represent one-dimensional structures with different local minima of symmetry. The width of these discontinuities is theorized to be approximately $10^{-32}$ meters, influenced by the energy levels at which phase transitions occur. This discussion clarifies that "approximately discontinuous" is a valid characterization within the context of topological defects.

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TL;DR
Are topological defects really discontinuous
Are topological defects such as domain walls really discontinuous (implying infinite slopes of the fields) or only approximately ?
 
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I don't know topology, but I do have a question. How can "discontinuous" not be a binary choice? What does "approximately discontinuous" mean?
 
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That's basically the definition of a topological defect, so yes, in a way.

They're not necessarily boundaries, though. Cosmic strings, for example, are one-dimensional structures where within the string the symmetry breaking that resulted in our observable universe is stuck in a different local minimum of symmetry of higher rest energy.

They can also be two-dimensional boundaries between different regions of distinct symmetry breaking (domain walls). If the rest energy differs, these domain walls will move at close to the speed of light.

As far as the width/size of the discontinuity, a quick Google search suggests that it depends upon the specific theory, but typical predictions around $10^{-32}$ meters (a thousand times the Planck length). I believe this is a thickness set by the energy at which the phase transition happens.
 

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