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- W2011198254 abstract "We consider a spin-12 electron in the framework of non-relativistic Quantum Electrodynamics (QED). Let H(p→,σ) denote the fiber Hamiltonian corresponding to the conserved total momentum p→∈R3 of the electron and the photon field, regularized by a fixed ultraviolet cutoff in the interaction term, and an infrared regularization parametrized by 0<σ≪1. Ultimately, our goal is to remove the latter by taking σ↘0. We prove that there exists a constant 0<α0≪1 independent of σ>0 such that for all |p→|<13 and all values of the finestructure constant 0<α<α0, there exists a ground state eigenvalue of multiplicity two at the bottom of the essential spectrum. Moreover, we prove that the renormalized electron mass satisfies 1<mren(p→,σ)<1+cα, uniformly in σ⩾0, in units where the bare mass has the value 1, and we prove the existence of the renormalized mass in the limit σ↘0. Our analysis uses the isospectral renormalization group method of Bach, Fröhlich, Sigal introduced in [V. Bach, J. Fröhlich, I.M. Sigal, Quantum electrodynamics of confined non-relativistic particles, Adv. Math. 137 (2) (1998) 299–395; V. Bach, J. Fröhlich, I.M. Sigal, Renormalization group analysis of spectral problems in quantum field theory, Adv. Math. 137 (1998) 205–298] and further developed in [V. Bach, T. Chen, J. Fröhlich, I.M. Sigal, Smooth Feshbach map and operator-theoretic renormalization group methods, J. Funct. Anal. 203 (1) (2003) 44–92; V. Bach, T. Chen, J. Fröhlich, I.M. Sigal, The renormalized electron mass in non-relativistic QED, J. Funct. Anal. 243 (2) (2007) 426–535]. The limit σ↘0 determines a scaling-critical (or endpoint type) renormalization group problem, in which the interaction is strictly marginal (of scale-independent size). A main result of this paper is the development of a method that provides rigorous control of the renormalization of a strictly marginal quantum field theory characterized by a non-trivial scaling limit. The key ingredients entering this analysis include a hierarchy of exact algebraic cancelation identities exploiting the spatial and gauge symmetries of the model, and a combination of the isospectral renormalization group method with the strong induction principle." @default.
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- W2011198254 date "2008-05-01" @default.
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- W2011198254 title "Infrared renormalization in non-relativistic QED and scaling criticality" @default.
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- W2011198254 doi "https://doi.org/10.1016/j.jfa.2008.01.001" @default.
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