摘要: The aim of this talk is to convince people that grand unified theories give a very nice and plausible explanation whole lot different at first sight unrelated phenomena, they definitely have the merit right be taken seriously. A detailed analysis many things I mention here may found in Ref. 1, which interested reader consult. I’ll try argue simple words synthesis (unification) strong-electromagnetic weak interactions beyond aesthetic appeal conceptual satisfaction necessity if for example we want understand charge quantization. Such picture has made successful predictions1 such as sin2θW ≃ 0.20, ms 0.5 GeV mb 5 time it possible explain absence appreciable accumulations antimatter universe, directly successfully estimate baryon photon ratio universe terms observable parameters elementary particle physics. Then with lifetime not far above present lower bounds. Since calculations proton usual theoretical uncertainties, would like urge experimentalists improve measurements on lifetime, because believe decay will most dramatic confirmation all forces.
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