A semiclassical expansion around a superfluid configuration computes Δ_{φ^n} at fixed λ*n, reproducing diagrammatic results at small λ*n and the large-charge CFT expansion at large λ*n.
Problems with Higgsplosion
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A recent calculation of the multi-Higgs boson production in scalar theories with spontaneous symmetry breaking has demonstrated the fast growth of the cross section with the Higgs multiplicity at sufficiently large energies, called "Higgsplosion". It was argued that "Higgsplosion" solves the Higgs hierarchy and fine-tuning problems. In our paper we argue that: a) the formula for "Higgsplosion" has a limited applicability and inconsistent with unitarity of the Standard Model; b) that the contribution from "Higgsplosion" to the imaginary part of the Higgs boson propagator cannot be re-summed in order to furnish a solution of the Higgs hierarchy and fine-tuning problems.
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The Epsilon Expansion Meets Semiclassics
A semiclassical expansion around a superfluid configuration computes Δ_{φ^n} at fixed λ*n, reproducing diagrammatic results at small λ*n and the large-charge CFT expansion at large λ*n.