Cosmic strings with positive $\Lambda$

Understand

We discuss cosmic Nielsen-Olesen strings in space-times endowed with a positive cosmological constant.

• For the cylindrically symmetric, static free cosmic string, we discuss the contribution of the cosmological constant to the angle deficit, and to the motion of the null/timelike geodesics.
• For a non-gravitating cosmic string in a Schwarzschild-de Sitter space-time, we discuss how a thin string can pierce the two horizons.
• We also present a metric which describes the exterior of a self gravitating thin string present in the Schwarzschild-de Sitter space-time.