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2021

Analytic expansions of two- and three-particle excited-state energies

Grabowska, Dorota M., Hansen, Maxwell T.

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The last years have seen significant developments in methods relating two- and three-particle finite-volume energies to scattering observables.

These relations hold for both weakly and strongly interacting systems, and studying their predictions in limiting cases can provide important cross checks as well as giving useful insights into the general formulae.
In these proceedings, we present analytic results for finite-volume excited states, recovered by expanding the general relations in powers of the interaction strength.
We highlight elegant patterns that emerge, especially for excited three-particle energies, and discuss various applications of the results.

Analytic expansions of two- and three-particle excited-state energies · Around

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