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The Sakai-Sugimoto soliton.

Bolognesi, S. and Sutcliffe, P.M. (2014) 'The Sakai-Sugimoto soliton.', Journal of high energy physics., 2014 (1). p. 78.


The Sakai-Sugimoto model is the preeminent example of a string theory de- scription of holographic QCD, in which baryons correspond to topological solitons in the bulk. Here we investigate the validity of various approximations of the Sakai-Sugimoto soliton that are used widely to study the properties of holographic baryons. These ap- proximations include the flat space self-dual instanton, a linear expansion in terms of eigenfunctions in the holographic direction and an asymptotic power series at large radius. These different approaches have produced contradictory results in the literature regarding properties of the baryon, such as relations for the electromagnetic form factors. Here we determine the regions of validity of these various approximations and show how to relate different approximations in contiguous regions of applicability. This analysis clarifies the source of the contradictory results in the literature and resolves some outstanding issues, including the use of the flat space self-dual instanton, the detailed properties of the asymp- totic soliton tail, and the role of the UV cutoff introduced in previous investigations. A consequence of our analysis is the discovery of a new large scale, that grows logarithmically with the ’t Hooft coupling, at which the soliton fields enter a nonlinear regime. Finally, we provide the first numerical computation of the Sakai-Sugimoto soliton and demonstrate that the numerical results support our analysis.

Item Type:Article
Additional Information:Published for SISSA by Springer
Keywords:Solitons Monopoles and Instantons, AdS-CFT Correspondence.
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
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Publisher statement:This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:23 December 2013
Date deposited:04 February 2014
Date of first online publication:16 January 2014
Date first made open access:No date available

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