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- W3102001318 abstract "We study the cosmological constant problem in a three-dimensional N=2 supergravity theory with gauge group SU[2]_{global}xU[1]_{local}. The model we consider is known to admit string-like configurations, the so-called semi-local cosmic strings. We show that the stability of these solutions is provided by supersymmetry through the existence of a lower bound for the energy, even though the manifold of the Higgs vacuum does not contain non-contractible loops. Charged Killing spinors do exist over configurations that saturate the Bogomolnyi bound, as a consequence of an Aharonov-Bohm-like effect. Nevertheless, there are no physical fermionic zero modes on these backgrounds. The exact vanishing of the cosmological constant does not imply, then, Bose-Fermi degeneracy. This provides a non-trivial example of the recent claim made by Witten on the vanishing of the cosmological constant in three dimensions without unphysical degeneracies." @default.
- W3102001318 created "2020-11-23" @default.
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- W3102001318 date "1997-01-01" @default.
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- W3102001318 title "Semi-local cosmic strings and the cosmological constant problem" @default.
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- W3102001318 doi "https://doi.org/10.1016/s0370-2693(96)01385-8" @default.
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