Abstract
We prove a Feynman path integral formula for the unitary group exp(—itLυ,θ), t ≥ 0, associated with a discrete magnetic Schrödinger operator Lυ,θ on a large class of weighted infinite graphs. As a consequence, we get a new Kato-Simon estimate \(\left| {\exp \left({- it{L_{v,\theta}}} \right)\left({x,y} \right)} \right| \le \exp \left({- t{L_{- \deg ,0}}} \right)\left({x,y} \right),\) which controls the unitary group uniformly in the potentials in terms of a Schrödinger semigroup, where the potential deg is the weighted degree function of the graph.
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Acknowledgements
The authors would like to thank Burkhard Eden, Evgeny Korotyaev, Ognjen Milatovic and Matthias Staudacher for very helpful discussions.
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Güneysu, B., Keller, M. Feynman path integrals for magnetic Schrödinger operators on infinite weighted graphs. JAMA 141, 751–770 (2020). https://doi.org/10.1007/s11854-020-0110-y
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DOI: https://doi.org/10.1007/s11854-020-0110-y