Thermal spectrum of pseudo-scalar glueballs and Debye screening mass from holography

Braga, Nelson R. F. (Instituto de Física, Universidade Federal do Rio de Janeiro, 0000 0001 2294 473X, Caixa Postal 68528, 21941-972, Rio de Janeiro, RJ, Brazil) ; Ferreira, Luiz F. (Instituto de Física, Universidade Federal do Rio de Janeiro, 0000 0001 2294 473X, Caixa Postal 68528, 21941-972, Rio de Janeiro, RJ, Brazil)

07 December 2017

Abstract: The finite temperature spectrum of pseudo-scalar glueballs in a plasma is studied using a holographic model. The 0-+ glueball is represented by a pseudo-scalar (axion) field living in a five dimensional geometry that comes from a solution of Einstein equations for gravity coupled with a dilaton scalar field. The spectral function obtained from the model shows a clear peak corresponding to the quasi-particle ground state. Analyzing the variation of the position of the peak with temperature, we describe the thermal behavior of the Debye screening mass of the plasma. As a check of consistency, the zero temperature limit of the model is also investigated. The glueball masses obtained are consistent with previous lattice results.


Published in: EPJC 77 (2017) 662
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-017-5232-8
License: CC-BY-3.0



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