Abstract
Supersymmetry transformations change the Lagrangian into a total derivative . On manifolds with boundaries the total derivative term is an obstruction to preserving supersymmetry. Such total derivative terms can be canceled by a boundary action without specifying boundary conditions, but only for a subalgebra of supersymmetry. We study compensating boundary actions for \( \mathcal{N}=1 \) supersymmetry in 4d, and show that they are determined independently of the details of the theory and of the boundary conditions. Two distinct classes of boundary actions exist, which correspond to preserving either a linear combination of supercharges of opposite chirality (called A-type) or supercharges of opposite chirality independently (B-type). The first option preserves a subalgebra isomorphic to \( \mathcal{N}=1 \) in 3d, while the second preserves only a 2d subgroup of the Lorentz symmetry and a subalgebra isomorphic to \( \mathcal{N}=\left(0,2\right) \) in 2d. These subalgebras are in one to one correspondence with half-BPS objects: the A-type corresponds to domain walls while the B-type corresponds to strings. We show that integrating the full current algebra and taking into account boundary contributions leads to an energy-momentum tensor which contains the boundary terms. The boundary terms come from the domain wall and string currents in the two respective cases.
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Di Pietro, L., Klinghoffer, N. & Shamir, I. On supersymmetry, boundary actions and brane charges. J. High Energ. Phys. 2016, 163 (2016). https://doi.org/10.1007/JHEP02(2016)163
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DOI: https://doi.org/10.1007/JHEP02(2016)163