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We analytically calculate the scaling exponents of a two-dimensional KPZ-likesystem: coherently moving incompressible polar active fluids. Using threedifferent renormalization group approximation schemes, we obtain values for the``roughness" exponent $\chi$ and anisotropy exponent $\zeta$ that are extremelynear the known exact results. This implies our prediction for the previouslycompletely unknown dynamic exponent $z$ is quantitatively accurate.

Dynamics of packed swarms: time-displaced correlators of two dimensional incompressible flocks