Theories Containing Cosmic Strings
In string theory the role of cosmic strings can be played by the fundamental strings (or F-strings) themselves that define the theory perturbatively, by D-strings which are related to the F-strings by weak-strong or so called S-duality, or higher dimensional D-, NS- or M-branes that are partially wrapped on compact cycles associated to extra spacetime dimensions so that only one non-compact dimension remains, see the article by Copeland, Myers and Polchinski (pdf).
The prototypical example of a quantum field theory with cosmic strings is the Abelian Higgs model. The quantum field theory and string theory cosmic strings are expected to have many properties in common, but more research is needed to determine the precise distinguishing features. The F-strings for instance are fully quantum-mechanical and do not have a classical definition, whereas the field theory cosmic strings are almost exclusively treated classically.
Read more about this topic: Cosmic String
Famous quotes containing the words theories, cosmic and/or strings:
“Generalisation is necessary to the advancement of knowledge; but particularly is indispensable to the creations of the imagination. In proportion as men know more and think more they look less at individuals and more at classes. They therefore make better theories and worse poems.”
—Thomas Babington Macaulay (1800–1859)
“Put on the whole armor of God, so that you may be able to stand against the wiles of the devil. For our struggle is not against enemies of blood and flesh, but against the rulers, against the authorities, against the cosmic powers of this present darkness, against the spiritual forces of evil in the heavenly places.”
—Bible: New Testament, Ephesians 6:11-12.
“When my lover came to bed,
the knot came untied
all by itself.
My dress,
held up by the strings of a loosened belt,
barely stayed on my hips.
Friend,
that’s as much as I know now.
When he touched my body,
I couldn’t at all remember
who he was,
who I was,
or how It was.”
—Amaru (c. seventh century A.D.)