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String Theory and Particle Physics by Angel M. Uranga, Luis E. Ibáñez

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Supersymmetry

Supersymmetry (SUSY) is a symmetry which combines fermions and bosons into the same multiplets. It plays a crucial role in the structure of string theory, and in fact its first appearance as a symmetry in physics arose in trying to extend the bosonic string to include fermions. In string theory, SUSY guarantees the absence of divergences and of tachyonic scalars. Moreover, as discussed in Section 1.3.3, the simplest version of supersymmetry in four dimensions may provide a perturbative solution to the electroweak hierarchy problem, and thus is key to many proposals for physics beyond the Standard Model. For these reasons, most 4d string theory compactifications studied to date are supersymmetric, and lead to SUSY effective theories ...

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