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HandWiki. Large Extra Dimension. Encyclopedia. Available online: https://encyclopedia.pub/entry/37537 (accessed on 25 September 2026).
HandWiki. Large Extra Dimension. Encyclopedia. Available at: https://encyclopedia.pub/entry/37537. Accessed September 25, 2026.
HandWiki. "Large Extra Dimension" Encyclopedia, https://encyclopedia.pub/entry/37537 (accessed September 25, 2026).
HandWiki. (2022, December 01). Large Extra Dimension. In Encyclopedia. https://encyclopedia.pub/entry/37537
HandWiki. "Large Extra Dimension." Encyclopedia. Web. 01 December, 2022.
Large Extra Dimension
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The content is sourced from: https://handwiki.org/wiki/Physics:Large_extra_dimension

In particle physics and string theory (M-theory), the ADD model, also known as the model with large extra dimensions (LED), is a model framework that attempts to solve the hierarchy problem. (Why is the force of gravity so weak compared to the electromagnetic force and the other fundamental forces?) The model tries to explain this problem by postulating that our universe, with its four dimensions (three spatial ones plus time), exists on a so called membrane floating in 11-dimensional space. It is then suggested that the other forces of nature (the electromagnetic force, strong interaction, and weak interaction) operate within this membrane and its four dimensions, while gravity can operate across all 11 dimensions. This would explain why gravity is very weak compared to the other fundamental forces. This is a radical theory given that the other 7 dimensions, which we do not observe, previously have been assumed to be very small (about a planck-length), while this theory asserts that they might be very large. The model was proposed by Nima Arkani-Hamed, Savas Dimopoulos, and Gia Dvali in 1998. Attempts to test the theory are executed by smashing together two protons in the Large Hadron Collider so that they disperse and release elementary particles. If a postulated graviton appeared after a collision, for such a particle to disappear, and its disappearance be observed, that would suggest that the graviton had escaped into other dimensions beyond our universe's observable four. No experiments from the Large Hadron Collider have been decisive thus far. However, the operation range of the LHC (13 TeV collision energy) covers only a small part of the predicted range in which evidence for LED would be recorded (a few TeV to 1016 TeV). This suggests that the theory might be more thoroughly tested with advanced technology.

large extra dimensions collider particle physics

References

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