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The phase diagram for the $(\lambda \phi ^{4}+\sigma \phi ^{2})_{2}$ model

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Preprint
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arXiv ID: hep-th/0204126
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arXiv
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Abstract

The two parameter model is reduced to a one parameter model by using simple transformations. Because the separation between different phase regions for a one parameter model is just a point, the equivalence between the two models leads to the exact equation of the line that separates the broken and un-broken phases in the $(\lambda ,\sigma)$ plane. Also, we obtain nontrivial estimates on the stability region for this model.

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