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Imaginary fixed points can be physical

by: Fan Zhong
Physical Review E, Vol. 86 (Aug 2012), 022104, doi:10.1103/physreve.86.022104  Key: citeulike:11180309

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Abstract

It has been proposed that a first-order phase transition driven to happen in the metastable region exhibits scaling and universality near an instability point controlled by an instability fixed point of a ϕ3 theory. However, this fixed point has an imaginary value and the renormalization-group flow of the ϕ3 coupling diverges at a finite scale. Here combining a momentum-space RG analysis and a nucleation theory near the spinodal point, we show that imaginary rather than real values are physical counterintuitively and thus the imaginary fixed point does control the scaling.


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