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, The speed v 0 has been set to unity without loss of generality
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, Derivation of hydrodynamic equations in the large reversal rate limit; (iii) Linear stability of the homogeneous ordered state; (iv) Numerical methods and details
, The g field equations both have a negative linear coefficient, regardless of density, noise, and reversal rate values In the fast reversal limit, these fields can therefore be enslaved to ? and f 1, the Supplemental Material [54], we derive equations directly in this limit and show that they behave similarly to the full equations
, A small region of weak instability is present deep in the ordered phase for a small reversal rate a. It quickly disappears upon increasing a. Furthermore, we found that no such residual instability exists at the kinetic level, i.e., when considering Eqs. (6) and (7) with a large number of modes. We conclude that it is spurious
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