## FANDOM

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Cosmic strings are hypothetical entities that might have been created in the Big Bang. They are thought to distort space in the following way: the ratio between the circumference and the radius of a circle drawn around such a string in the plane perpendicular to it will be less than $2 \pi \,$. The difference in angle is often referred to as angle deficit, denoted $\Delta$. This angle can be related to the mass density per unit length $\mu$ of the string using gravitational lensing arguments

$\Delta \approx \frac{G \mu}{c^2}$

where $G$ is the universal constant of gravity, and $c$ is the speed of light.