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Instability of non-commutative SYM theories at finite temperature

par Landsteiner, Karl;Lopez, Esperanza;Tytgat, Michel
Référence The journal of high energy physics (Online), 5, 6, page (XLV-23)
Publication Publié, 2001

Article révisé par les pairs

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Résumé :

We extend our previous work on the quasi-particle excitations in N = 4 non-commutative U(1) Yang-Mills theory at finite temperature. We show that above some critical temperature there is a tachyon in the spectrum of excitations. It is a collective transverse photon mode polarized in the non-commutative plane. Thus the theory seems to undergo a phase transition at high temperature. Furthermore we find that the group velocity of quasi-particles generically exceeds the speed of light at low momentum.