Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2002/iii/paper-68/1/h/solution

At two derivatives, specify the gauge group and matter representations, a real Kähler potential , a holomorphic superpotential and a symmetric holomorphic gauge kinetic function . Gauge couplings and topological angles are contained in ; global theories can also have allowed Fayet–Iliopoulos terms for Abelian factors. Local theories require the gravitational coupling and consistent gauging: a constant Fayet–Iliopoulos term is not an independent addition to arbitrary supergravity data. A constant in affects supergravity although it is irrelevant in the global theory. is not holomorphic or protected; has no perturbative Wilsonian renormalization; holomorphic is perturbatively one-loop exact. Nonperturbative corrections can modify and , and wave-function renormalization makes physical couplings run despite superpotential non-renormalization. Higher-derivative actions require further data.

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