Figure 1: Strings, particles and extra dimensions. | Nature

Figure 1: Strings, particles and extra dimensions.

From: Into the fifth dimension

Figure 1

Strings moving in the fifth dimension are represented in the everyday world by their projection onto the four-dimensional boundary of the five-dimensional space-time. The same string located at different positions along the fifth dimension corresponds to particles of different sizes in four dimensions: the further away the string, the larger the particle. The projection of a string that is very close to the boundary of the four-dimensional world can appear to be a point-like particle.

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