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We propose a minimal microscopic model for active nematic particles similarin spirit to the Vicsek model for self-propelled polar particles. In twodimensions, we show that this model exhibits a Kosterlitz-Thouless-liketransition to quasi-long-range orientational order and that in thisnon-equilibrium context, the ordered phase is characterized by giant densityfluctuations, in agreement with the predictions of Ramaswamy {\it et al.}[Europhys. Lett. {\bf 62}, 196 (2003)].Comment: Submitted to Phys. Rev. Lett. 4 pages, 4 figure

Simple Model for Active Nematics: Quasi-Long-Range Order and Giant Fluctuations