Impossibility to describe repulsion with contact interaction

Details Impossibility to describe repulsion with contact interaction Impossibility to describe repulsion with contact interaction

2009-01-23

arxiv.org/abs/0901.3650v2

Phys. Lett. A, 374, 644-646 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages comment

Scientific paper

Contact interactions always lead to attractive behaviour. Arguments are
presented to show why a repulsive interacting system, e.g. Bose gases, cannot
be described by contact interactions and corresponding treatments are possibly
obscured by the appearance of bound states. The usually used cut-offs are
identified as finite range parameters.

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