Abstract
We analyze the spectrum of open strings stretched between a D-brane and an anti-D-brane in planar AdS/CFT using various tools. We focus on open strings ending on two giant gravitons with different orientation in AdS 5 × S 5 and study the spectrum of string excitations using the following approaches: open spin-chain, boundary asymptotic Bethe ansatz and boundary thermodynamic Bethe ansatz (BTBA). We find agreement between a perturbative high order diagrammatic calculation in \( \mathcal{N} \) = 4 SYM and the leading finite-size boundary Lüscher correction. We study the ground state energy of the system at finite coupling by deriving and numerically solving a set of BTBA equations. While the numerics give reasonable results at small coupling, they break down at finite coupling when the total energy of the string gets close to zero, possibly indicating that the state turns tachyonic. The location of the breakdown is also predicted analytically.
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Bajnok, Z., Drukker, N., Hegedűs, Á. et al. The spectrum of tachyons in AdS/CFT. J. High Energ. Phys. 2014, 55 (2014). https://doi.org/10.1007/JHEP03(2014)055
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DOI: https://doi.org/10.1007/JHEP03(2014)055