Multi-extended-objects excitation in the massive Thirring model

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Abstract
The Bethe-ansatz approach by Bergknoff and Thacker on the massive Thirring model is extended to study a multi-extended-objects (solitons and breathers) excitation. The quantization of the physical momentum of each extended object can be written in a Bethe-ansatz form using renormalized phase shifts for the scattering of extended objects.