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      Multispin magnons on deformed \( AdS_{3}\times S^{3} \)

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          Abstract

          In this paper, using the holographic prescription, we study multispin bound states and their dispersion relations over the \( \kappa \)-deformed \( AdS_{3}\times S^{3} \) background. In the first part of our analysis, considering the conformal gauge conditions (associated with the Polyakov action) we explore the dispersion relation associated with spin two bound states at strong coupling. We solve corresponding world-sheet fluctuations and compute all the conserved quantities associated with the stringy dynamics over the deformed background. In the second part of our analysis, we perform similar analysis for spin three configurations. In both cases, we observe the emergence of non trivial background deformation that vanishes in the limit, \( \kappa \rightarrow 0\).

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          Magnon Bound States and the AdS/CFT Correspondence

          Nick Dorey (2006)
          We study the spectrum of asymptotic states in the spin-chain description of planar N=4 SUSY Yang-Mills. In addition to elementary magnons, the asymptotic spectrum includes an infinite tower of multi-magnon bound states with exact dispersion relation, Delta-J_{1} = sqrt{Q^{2}+(lambda/pi^2)sin^2(p/2)}, where the positive integer Q is the number of constituent magnons. These states account precisely for the known poles in the exact S-matrix. Like the elementary magnon, they transform in small representations of supersymmetry and are present for all values of the 't Hooft coupling. At strong coupling we identify the dual states in semiclassical string theory.
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            Giant Magnons

            Studies of \({\cal N}=4\) super Yang Mills operators with large R-charge have shown that, in the planar limit, the problem of computing their dimensions can be viewed as a certain spin chain. These spin chains have fundamental ``magnon'' excitations which obey a dispersion relation that is periodic in the momentum of the magnons. This result for the dispersion relation was also shown to hold at arbitrary 't Hooft coupling. Here we identify these magnons on the string theory side and we show how to reconcile a periodic dispersion relation with the continuum worldsheet description. The crucial idea is that the momentum is interpreted in the string theory side as a certain geometrical angle. We use these results to compute the energy of a spinning string. We also show that the symmetries that determine the dispersion relation and that constrain the S-matrix are the same in the gauge theory and the string theory. We compute the overall S-matrix at large 't Hooft coupling using the string description and we find that it agrees with an earlier conjecture. We also find an infinite number of two magnon bound states at strong coupling, while at weak coupling this number is finite.
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              An integrable deformation of the AdS_5 x S^5 superstring action

              An integrable deformation of the type IIB AdS_5 x S^5 superstring action is presented. The deformed field equations, Lax connection, and kappa-symmetry transformations are given. The original psu(2,2|4) symmetry is expected to become q-deformed.
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                Author and article information

                Journal
                2016-12-19
                2017-03-24
                Article
                1612.06217
                bee5f3cf-9e8a-461f-aa14-da90bb33830e

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Substantially revised version, To Appear In Physical Review D (PRD)
                hep-th

                High energy & Particle physics
                High energy & Particle physics

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