Semi-local cosmic strings and the cosmological constant problem

dc.creatorEdelstein Glaubach, José Daniel
dc.date1997
dc.date2021-08-19T15:42:27Z
dc.date.accessioned2023-07-15T02:45:52Z
dc.date.available2023-07-15T02:45:52Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/122981
dc.identifierhttps://www.sciencedirect.com/science/article/abs/pii/S0370269396013858?via%3Dihub
dc.identifierissn:0370-2693
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7463183
dc.descriptionWe study the cosmological constant problem in a three-dimensional N = 2 supergravity theory with gauge group SU (2)<sub>global</sub> × U (1)<sub>local</sub>. 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 solitonic 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 Bogomol'nyi bound, as a consequence of an Aharonov-Bohmlike 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.
dc.descriptionFacultad de Ciencias Exactas
dc.formatapplication/pdf
dc.format101-106
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectFísica
dc.subjectCiencias Exactas
dc.subjectSupersymmetry
dc.subjectGauge group
dc.subjectCosmic string
dc.subjectHiggs boson
dc.subjectSupergravity
dc.titleSemi-local cosmic strings and the cosmological constant problem
dc.typeArticulo
dc.typeArticulo


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