%0 Journal Article
%J J. Phys. A 40 (2007) 14819-14842
%D 2007
%T The number of eigenvalues of three-particle SchrÃ¶dinger operators on lattices
%A Sergio Albeverio
%A Gianfausto Dell'Antonio
%A Saidakhmat N. Lakaev
%X We consider the Hamiltonian of a system of three quantum mechanical particles (two identical fermions and boson)on the three-dimensional lattice $\\\\Z^3$ and interacting by means of zero-range attractive potentials. We describe the location and structure of the essential spectrum of the three-particle discrete Schr\\\\\\\"{o}dinger operator $H_{\\\\gamma}(K),$ $K$ being the total quasi-momentum and $\\\\gamma>0$ the ratio of the mass of fermion and boson.\\nWe choose for $\\\\gamma>0$ the interaction $v(\\\\gamma)$ in such a way the system consisting of one fermion and one boson has a zero energy resonance.\\nWe prove for any $\\\\gamma> 0$ the existence infinitely many eigenvalues of the operator $H_{\\\\gamma}(0).$ We establish for the number $N(0,\\\\gamma; z;)$ of eigenvalues lying below $z<0$ the following asymptotics $$ \\\\lim_{z\\\\to 0-}\\\\frac{N(0,\\\\gamma;z)}{\\\\mid \\\\log \\\\mid z\\\\mid \\\\mid}={U} (\\\\gamma) .$$ Moreover, for all nonzero values of the quasi-momentum $K \\\\in T^3 $ we establish the finiteness of the number $ N(K,\\\\gamma;\\\\tau_{ess}(K))$ of eigenvalues of $H(K)$ below the bottom of the essential spectrum and we give an asymptotics for the number $N(K,\\\\gamma;0)$ of eigenvalues below zero.
%B J. Phys. A 40 (2007) 14819-14842
%G en_US
%U http://hdl.handle.net/1963/2576
%1 1545
%2 Mathematics
%3 Mathematical Physics
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2008-01-28T14:20:38Z\\nNo. of bitstreams: 1\\n0703191v1.pdf: 254244 bytes, checksum: a662f118f430d7b424e751fa5f07ed92 (MD5)
%R 10.1088/1751-8113/40/49/015
%0 Journal Article
%J Int. J. Mod. Phys. B 14 (2000) 721-727
%D 2000
%T A Remark on One-Dimensional Many-Body Problems with Point Interactions
%A Sergio Albeverio
%A Ludwik Dabrowski
%A Shao-Ming Fei
%X The integrability of one dimensional quantum mechanical many-body problems with general contact interactions is extensively studied. It is shown that besides the pure (repulsive or attractive) $\\\\delta$-function interaction there is another singular point interactions which gives rise to a new one-parameter family of integrable quantum mechanical many-body systems. The bound states and scattering matrices are calculated for both bosonic and fermionic statistics.
%B Int. J. Mod. Phys. B 14 (2000) 721-727
%I World Scientific
%G en_US
%U http://hdl.handle.net/1963/3214
%1 1087
%2 Mathematics
%3 Mathematical Physics
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2008-10-30T11:10:07Z\\nNo. of bitstreams: 1\\n0001089v1.pdf: 116474 bytes, checksum: e9cac488b17f06674f7abc822769dc6a (MD5)
%R 10.1142/S0217979200000601