### topological defect

(defect in space that could arise in the early universe)

In cosmology, a **topological defect** is a discontinuity in
space. Some theories expect their formation during symmetry breaking
that divided earlier, more general forces into the currently known
specific forces of nature: gravity, electromagnetism, the
strong force and the weak force.

Such defects are classified as follows:

**monopole** (at a point).
- cosmic string (over one dimension).
**domain wall** (over two dimensions).
**texture** (over three dimensions).

When the cosmic microwave background cold spot was identified,
one theory was that it was a sign of a *texture*.

(*cosmology,relativity*)
http://en.wikipedia.org/wiki/Topological_defect

http://en.wikipedia.org/wiki/Texture_(cosmology)

http://en.wikipedia.org/wiki/Domain_wall

http://en.wikipedia.org/wiki/Monopole_(mathematics)

https://arxiv.org/abs/astro-ph/0110285

**Referenced by:**

cosmic string

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