--- res: bibo_abstract: - We give a lower bound on the ground state energy of a system of two fermions of one species interacting with two fermions of another species via point interactions. We show that there is a critical mass ratio m2 ≈ 0.58 such that the system is stable, i.e., the energy is bounded from below, for m∈[m2,m2−1]. So far it was not known whether this 2 + 2 system exhibits a stable region at all or whether the formation of four-body bound states causes an unbounded spectrum for all mass ratios, similar to the Thomas effect. Our result gives further evidence for the stability of the more general N + M system.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Thomas foaf_name: Moser, Thomas foaf_surname: Moser foaf_workInfoHomepage: http://www.librecat.org/personId=2B5FC9A4-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Robert foaf_name: Seiringer, Robert foaf_surname: Seiringer foaf_workInfoHomepage: http://www.librecat.org/personId=4AFD0470-F248-11E8-B48F-1D18A9856A87 orcid: 0000-0002-6781-0521 bibo_doi: 10.1007/s11040-018-9275-3 bibo_issue: '3' bibo_volume: 21 dct_date: 2018^xs_gYear dct_identifier: - UT:000439639700001 dct_isPartOf: - http://id.crossref.org/issn/13850172 - http://id.crossref.org/issn/15729656 dct_language: eng dct_publisher: Springer@ dct_title: Stability of the 2+2 fermionic system with point interactions@ ...