The spectrum of tachyons in AdS/CFT

Bajnok, Zoltán and Drukker, Nadav and Hegedüs, Árpád and Nepomechie, Rafael and Palla, László and Sieg, Christoph and Suzuki, Ryo (2014) The spectrum of tachyons in AdS/CFT. JOURNAL OF HIGH ENERGY PHYSICS, 1403. ISSN 1126-6708


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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 AdS5 x S5 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 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.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC05 Physical nature of matter / részecskefizika
Depositing User: dr. Árpád Hegedüs
Date Deposited: 15 Sep 2014 21:30
Last Modified: 15 Sep 2014 21:30

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