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We characterize the long-time behavior of solutions, provided that D(ϕ) and (η(ϕ))−1 are bounded away from zero. For constitutive laws of the form D(ϕ) = ϕ m with m > 0 and η(ϕ) = 1 we prove short-time existence of solutions with constant, compact support.
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Wolf‐Patrick Düll (2006) studied this question.
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