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Why are particle accelerators unable to observe strings directly?
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string theory
Brian Greene explains the basic idea of string theory in under three minutes.
In string theory, the inability of particle accelerators to observe strings directly is due to their infinitesimal size. According to the theory, elementary particles are not point-like but possess a linear extension known as the Planck length, which is approximately cm.12
This scale is far smaller than the distances that can be probed by any particle accelerator currently available on Earth. Because strings are so small, they appear as points in experimental observations, and their internal structure remains beyond the reach of current technology. Consequently, physicists have been unable to detect them directly and must instead seek indirect evidence for the theory.12