### Abstract

Fumi's theorem relates the ground state energy to phase shifts and hence the scattering matrix. In turn a theorem associated with the auxiliary particles relates the ground state energy to its self-energy, on shell and implies that the latter can be written in terms of the scattering matrix. These relationships are described along with the role of the infrared divergences.

Original language | English (US) |
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Pages (from-to) | 179-180 |

Number of pages | 2 |

Journal | Physica B: Condensed Matter |

Volume | 259-261 |

DOIs | |

State | Published - Jan 1 1999 |

### Keywords

- Auxiliary particles
- Fumi's theorem
- Kondo problem

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering

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## Cite this

Barnes, S. E. (1999). Auxiliary particles and Fumi's theorem.

*Physica B: Condensed Matter*,*259-261*, 179-180. https://doi.org/10.1016/S0921-4526(98)01148-X