We study field-theoretic A+A{→}0/ in a perturbative renormalization-group framework. We calculate the reacted fraction and it is shown that, in addition to the reaction coupling constant, a second ``crossover'' parameter must be treated to all orders to obtain meaningful long-time results for spatial dimensions d{≤}2. At d=2 the result is consistent with known rigorous long-time bounds, but the short-time behavior remains inconsistent (trivial) analogously to the Landau ghost of QED and φ⁴ theory. We argue that this inconsistency is true to all orders in the coupling constants.
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Friedman et al. (1992) studied this question.
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