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Bulk viscosity and the conformal anomaly in the pion gas

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Publication Date
2009-03-27
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Fernández Fraile, Daniel
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American Physical Society
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We calculate the bulk viscosity of the massive pion gas within unitarized chiral perturbation theory. We obtain a low-temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and conformal breaking supports a recent QCD proposal. We discuss the role of resonances, heavier states, and large-N(c) counting.
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© 2009 The American Physical Soci. We are grateful to D. Kharzeev, G. D. Moore, and C. Pica for very useful comments. This research was partially funded by research contracts No. FPA2004-02602, No. FPA2005-02327, No. FPA2007-29115-E, No. PR34- 1856-BSCH, No. UCM-CAM 10309, and No. FPI-BES- 2005-6726.
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[1] J. Adams et al. (STAR Collaboration), Phys. Rev. Lett. 92, 052302 (2004). [2] P. Romatschke and U. Romatschke, Phys. Rev. Lett. 99, 172301 (2007); H. Song and U. W. Heinz, Phys. Lett. B 658, 279 (2008); K. Dusling and D. Teaney, Phys. Rev. C 77, 034905 (2008). [3] F. Karsch, D. Kharzeev, and K. Tuchin, Phys. Lett. B 663, 217 (2008). [4] G. Torrieri, B. Tomasik, and I. Mishustin, Phys. Rev. C 77, 034903 (2008). [5] I. A. Shushpanov, J. I. Kapusta, and P. J. Ellis, Phys. Rev. C 59, 2931 (1999). [6] M. Cheng et al., Phys. Rev. D 77, 014511 (2008). [7] G. D. Moore and O. Saremi, J. High Energy Phys. 09 (2008) 015. [8] H. B. Meyer, Phys. Rev. Lett. 100, 162001 (2008); J. High Energy Phys. 08 (2008) 031. [9] K. Hubner, F. Karsch, and C. Pica, Phys. Rev. D 78, 094501 (2008). [10] P. Arnold, C. Dogan and G. D. Moore, Phys. Rev. D 74, 085021 (2006). [11] P. Gerber and H. Leutwyler, Nucl. Phys. B321, 387 (1989). [12] D. Fernández-Fraile and A. Gómez Nicola, Phys. Rev. D 73, 045025 (2006); Eur. Phys. J. A 31, 848 (2007). [13] D. Fernández-Fraile and A. Gómez Nicola, Int. J. Mod. Phys. E 16, 3010 (2007). [14] J. L. Goity and H. Leutwyler, Phys. Lett. B 228, 517 (1989). [15] S. Jeon, Phys. Rev. D 52, 3591 (1995); S. Jeon and L. G. Yaffe, Phys. Rev. D 53, 5799 (1996). [16] C. Song and V. Koch, Phys. Rev. C 55, 3026 (1997). [17] C. M. Hung and E. V. Shuryak, Phys. Rev. C 57, 1891 (1998); P. F. Kolb and R. Rapp, Phys. Rev. C 67, 044903 (2003). [18] S. Gavin, Nucl. Phys. A435, 826 (1985). [19] M. Prakash, M. Prakash, R. Venugopalan, and G. Welke, Phys. Rep. 227, 321 (1993). [20] J. W. Chen and J. Wang, arXiv:0711.4824. [21] A. Dobado and F. J. Llanes-Estrada, Eur. Phys. J. C 49, 1011 (2007). [22] A. Hosoya, M. A. Sakagami, and M. Takao, Ann. Phys. (N.Y.) 154, 229 (1984). [23] R. Horsley and W. Schoenmaker, Nucl. Phys. B280, 716 (1987). [24] D. Fernández-Fraile, A. Gómez Nicola, and E. T. Herruzo, Phys. Rev. D 76, 085020 (2007). [25] J. C. Collins, A. Duncan, and S. D. Joglekar, Phys. Rev. D 16, 438 (1977). [26] N. O. Agasian, JETP Lett. 74, 353 (2001). [27] H. Leutwyler, in Proceedings of Effective Field Theories of the Standard Model, Dobogokoe 1991, edited by Ulf G. Meissner (World Scientific, River Edge, NJ, 1992), pp. 193– 224. [28] K. Paech and S. Pratt, Phys. Rev. C 74, 014901 (2006). [29] J. Gasser and H. Leutwyler, Nucl. Phys. B250, 465 (1985). [30] D. Espriu, E. de Rafael, and J. Taron, Nucl. Phys. B345, 22 (1990); B355, 278 (1991)].
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