Abstract
The organizers have asked me to review grand unified theories (GUTs) during these lectures. Many reviews of classical GUTs exist, and it seems to me unnecessarily repetitious to give another detailed discussion in this set of lecture notes. Instead, I have decided to start with only a brief reminder and update on recent developments in classical GUTs. The latter are neither copious nor encouraging: the proton obstinately refuses to decay in the manner suggested to it by Georgi and Glashow. It seems to me unlikely that minimal SU(5) can still be compatible with experiment. It should be modified, but I find rather unappealing recent modifications of the minimal SU(5) model which do not involve supersymmetry. In my opinion, the smart money had already moved into supersymmetric GUTs, even before the regrettable reluctance of the proton to decay into e+π0 became apparent.
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Ellis, J. (1985). Supersymmetric GUTS. In: Fritzsch, H., Peccei, R.D., Saller, H., Wagner, F. (eds) Quarks, Leptons, and Beyond. NATO ASI Series, vol 122. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2254-0_13
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