The depinning of charge-density waves and loop-erased random walks are both shown to be governed by O(n=-2) phi^4 theory, giving a high-precision dynamic exponent.
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Depinning transition of charge-density waves: mapping onto $O(n)$ symmetric $\phi^4$ theory with $n\to -2$ and loop-erased random walks
The depinning of charge-density waves and loop-erased random walks are both shown to be governed by O(n=-2) phi^4 theory, giving a high-precision dynamic exponent.