Domain wall (string theory)

For other uses, see Domain wall.

In string theory, a domain wall is a theoretical (d−1)-dimensional singularity. A domain wall is meant to represent an object of codimension one embedded into space (a defect in space localized in one spatial dimension). For example, D8-branes are domain walls in type II string theory. In M-theory, the existence of Horava–Witten domain walls, "ends of the world" that carry an E8 gauge theory, is important for various relations between superstring theory and M-theory.

If domain walls exist, their interactions are hypothesized to emit gravitational waves that would be detectable by LIGO and similar experiments.^[1]

See also

• Topological defect
• Cosmic string
• Membrane (M-theory)
• Gravitational singularity

References

1. Jaeckel, Joerg; Khoze, Valentin V.; Spannowsky, Michael (2016). "Hearing the signal of dark sectors with gravitational wave detectors". Physical Review D. 94 (10): 103519. arXiv:1602.03901. Bibcode:2016PhRvD..94j3519J. doi:10.1103/PhysRevD.94.103519.