期刊
NUCLEAR PHYSICS B
卷 705, 期 1-2, 页码 152-166出版社
ELSEVIER
DOI: 10.1016/j.nuclphysb.2004.10.063
关键词
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We explore solutions of six-dimensional gravity coupled to a non-linear sigma model, in the presence of codimension-two branes. We investigate the compactifications induced by a spherical scalar manifold and analyze the conditions under which they are of finite volume and singularity free. We discuss the issue of single-valuedness of the scalar fields and provide some special embedding of the scalar manifold to the internal space which solves this problem. These brane solutions furnish some self-tuning features, however they do not provide a satisfactory explanation of the vanishing of the effective four-dimensional cosmological constant. We discuss the properties of this model in relation with the self-tuning example based on a hyperbolic sigma model. (C) 2004 Elsevier B.V. All rights reserved.
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