Connecting giant magnons to the pp-wave: An interpolating limit of $Ad{S}_5\times S^5$

Abstract

We consider a particular large-radius limit of the worldsheet $S$-matrix for strings propagating on $Ad{S}_5\times S^5$. This limiting theory interpolates smoothly between the so-called plane-wave and giant-magnon regimes of the theory. The sigma model in this region simplifies; it stands as a toy model of the full theory, and may be easier to solve directly. The $S$ matrix of the limiting theory is non-trivial, and receives contributions to all orders in the ${\alpha }^{\prime }$ expansion. We analyze a guess for the full worldsheet $S$ matrix that was formulated recently by Beisert, Hernandez and Lopez, and Beisert, Eden, and Staudacher, and take the corresponding limit. After doing a Borel resummation we find that the proposed $S$ matrix reproduces the expected results in the giant-magnon region. In addition, we rely on general considerations to draw some basic conclusions about the analytic structure of the $S$ matrix.

arXiv comment39 pages 5 figures; v2: Statement about singularities at $u_1-u_2=i$ corrected; v3: Typos, signs and coefficients corrected

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