Excitations in Hot Non-Commutative Theories
نویسندگان
چکیده
We study the dispersion relation for scalar excitations in supersymmetric, noncommutative theories at finite temperature. In N =4 Yang-Mills the low momenta modes have superluminous group velocity. In the massless Wess-Zumino model the minimum of the dispersion relation is at non zero momentum for temperatures above T0 ≈ (gθ) 1 2 . We briefly comment on N =2 Yang-Mills at finite density.
منابع مشابه
Instability of non-commutative SYM theories at finite temperature
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 w...
متن کاملPerturbative Wilson loop in two-dimensional non-commutative Yang-Mills theory
We perform a perturbative O(g4) Wilson loop calculation for the U(N) YangMills theory defined on non-commutative one space one time dimensions. We choose the light-cone gauge and compare the results obtained when using the Wu-Mandelstam-Leibbrandt (WML) and the Cauchy principal value (PV ) prescription for the vector propagator. In the WML case the θ-dependent term is well-defined and regular i...
متن کاملGauge and BRST Generators for Space-Time Non-commutative U(1) Theory
The Hamiltonian (gauge) symmetry generators of non-local (gauge) theories are presented. The construction is based on the d + 1 dimensional space-time formulation of d dimensional non-local theories. The procedure is applied to U(1) space-time non-commutative gauge theory. In the Hamiltonian formalism the Hamiltonian and the gauge generator are constructed. The nilpotent BRST charge is also obt...
متن کاملDuality and Non-Commutative Gauge Theory
We study the generalization of S-duality to non-commutative gauge theories. For rank one theories, we obtain the leading terms of the dual theory by Legendre transforming the Lagrangian of the non-commutative theory expressed in terms of a commutative gauge field. The dual description is weakly coupled when the original theory is strongly coupled if we appropriately scale the non-commutativity ...
متن کاملThe Quasiparticle Structure of Hot Gauge Theories
The study of the ultrarelativistic plasmas in perturbation theory is plagued with infrared divergences which are not eliminated by the screening corrections. They affect, in particular, the computation of the lifetime of the elementary excitations, thus casting doubt on the validity of the quasiparticle picture. We show that, for Abelian plasmas at least, the infrared problem of the damping rat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000