Semi-local cosmic strings and the cosmological constant problem

We 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 t...

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Detalles Bibliográficos
Autor principal: Edelstein Glaubach, José Daniel
Formato: Articulo
Lenguaje:Inglés
Publicado: 1997
Materias:
Física
Ciencias Exactas
Supersymmetry
Gauge group
Cosmic string
Higgs boson
Supergravity
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/122981
https://www.sciencedirect.com/science/article/abs/pii/S0370269396013858?via%3Dihub
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-122981
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
Supersymmetry
Gauge group
Cosmic string
Higgs boson
Supergravity
spellingShingle Física
Ciencias Exactas
Supersymmetry
Gauge group
Cosmic string
Higgs boson
Supergravity
Edelstein Glaubach, José Daniel
Semi-local cosmic strings and the cosmological constant problem
topic_facet Física
Ciencias Exactas
Supersymmetry
Gauge group
Cosmic string
Higgs boson
Supergravity
description We 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.
format Articulo
Articulo
author Edelstein Glaubach, José Daniel
author_facet Edelstein Glaubach, José Daniel
author_sort Edelstein Glaubach, José Daniel
title Semi-local cosmic strings and the cosmological constant problem
title_short Semi-local cosmic strings and the cosmological constant problem
title_full Semi-local cosmic strings and the cosmological constant problem
title_fullStr Semi-local cosmic strings and the cosmological constant problem
title_full_unstemmed Semi-local cosmic strings and the cosmological constant problem
title_sort semi-local cosmic strings and the cosmological constant problem
publishDate 1997
url http://sedici.unlp.edu.ar/handle/10915/122981
https://www.sciencedirect.com/science/article/abs/pii/S0370269396013858?via%3Dihub
work_keys_str_mv AT edelsteinglaubachjosedaniel semilocalcosmicstringsandthecosmologicalconstantproblem
bdutipo_str Repositorios
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