### 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 the formation of such defects
during the early universe's 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*)
**Further reading:**

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 pages:**

cosmic string

primordial black hole

primordial gravitational waves

Index