Abstract
We reconsider the Gram-Hadamard bound as it is used in constructive quantum field theory and many body physics to prove convergence of Fermionic perturbative expansions. Our approach uses a recursion for the amplitudes of the expansion, discovered in a model problem by Djokic (2013). It explains the standard way to bound the expansion from a new point of view, and for some of the amplitudes provides new bounds, which avoid the use of Fourier transform, and are therefore superior to the standard bounds for models like the cold interacting Fermi gas.
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Lohmann, M. Some Improved Nonperturbative Bounds for Fermionic Expansions. Math Phys Anal Geom 19, 6 (2016). https://doi.org/10.1007/s11040-016-9211-3
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DOI: https://doi.org/10.1007/s11040-016-9211-3