Massless Mode and Positivity Violation in Hot QCD

Su N, Tywoniuk K (2015)
Physical Review Letters 114(16).

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Abstract
We calculate the quark self-energy at one-loop level at high temperature, taking into account contributions from both the (chromo) electric scale gT and the (chromo) magnetic scale g(2)T. While reproducing standard massive excitations due to the electric scale, we uncover a novel massless excitation ascribable to the magnetic scale. The residue of this massless excitation is nonpositive at all temperatures, which consequently gives rise to positivity violation in the quark spectral functions. This demonstrates the profound impact of confinement effects on thermal quark collective excitations, which manifest genuine long-range correlations in the system.
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Su N, Tywoniuk K. Massless Mode and Positivity Violation in Hot QCD. Physical Review Letters. 2015;114(16).
Su, N., & Tywoniuk, K. (2015). Massless Mode and Positivity Violation in Hot QCD. Physical Review Letters, 114(16).
Su, N., and Tywoniuk, K. (2015). Massless Mode and Positivity Violation in Hot QCD. Physical Review Letters 114.
Su, N., & Tywoniuk, K., 2015. Massless Mode and Positivity Violation in Hot QCD. Physical Review Letters, 114(16).
N. Su and K. Tywoniuk, “Massless Mode and Positivity Violation in Hot QCD”, Physical Review Letters, vol. 114, 2015.
Su, N., Tywoniuk, K.: Massless Mode and Positivity Violation in Hot QCD. Physical Review Letters. 114, (2015).
Su, Nan, and Tywoniuk, Konrad. “Massless Mode and Positivity Violation in Hot QCD”. Physical Review Letters 114.16 (2015).
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PMID: 25955045
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arXiv 1409.3203

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