Geodesic
Quasi-classical ground states. I. Linearly coupled Pauli–Fierz Hamiltonians
Documenta mathematica, Tome 28 (2023) no. 5, pp. 1191-1233

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We consider a spinless, non-relativistic particle bound by an external potential and linearly coupled to a quantized radiation field. The energy E(u,f) of product states of the form u⊗Ψf​, where u is a normalized state for the particle and Ψf​ is a coherent state in Fock space for the field, gives the energy of a Klein–Gordon–Schrödinger system. We minimize the functional E(u,f) on its natural energy space. We prove the existence and uniqueness of a ground state under general conditions on the coupling function. In particular, neither an ultraviolet cutoff nor an infrared cutoff is imposed. Our results establish the convergence in the ultraviolet limit of both the ground state and ground state energy of the Klein–Gordon–Schrödinger energy functional, and provide the second-order asymptotic expansion of the ground state energy at small coupling.
DOI : 10.4171/dm/929
Classification : 81T99, 35Q40
Mots-clés : Ground states, quasi-classical limit, non-relativistic quantum electrodynamics, calculus of variations, Nelson model, Hartree energy functional, ultraviolet limit 
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     author = {S\'ebastien Breteaux and J\'er\'emy Faupin and Jimmy Payet},
     title = {Quasi-classical ground states. {I.} {Linearly} coupled {Pauli{\textendash}Fierz} {Hamiltonians}},
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Sébastien Breteaux; Jérémy Faupin; Jimmy Payet. Quasi-classical ground states. I. Linearly coupled Pauli–Fierz Hamiltonians. Documenta mathematica, Tome 28 (2023) no. 5, pp. 1191-1233. doi: 10.4171/dm/929

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