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1. Cosmic String

   Linked via "deflection angle"

   Gravitational Lensing
   A straight, infinitely long cosmic string creates a characteristic double-image gravitational lens effect. Objects positioned directly behind the string appear as two distinct images positioned symmetrically around the string's apparent location. The deflection angle $\hat{\alpha}$ is independent of the impact parameter (for small angles) and is dependent solely on the string tension/} $T$ and the [speed of light](/entri…

2. Cosmic String

   Linked via "deflection angle"

   Extradimensional Analogs
   In models incorporating higher spatial dimensions, cosmic strings often manifest as brane remnants or as the zero-modes of fundamental fields/) compactified on a circle ($S^1$). In these scenarios, the string is not truly one-dimensional but rather a three-dimensional object (a D3-brane, for example) wrapped around a compact dimension, possessing a thickness related to the [string scale](/entries/string…