Pérez Fernández, P.Relaño Pérez, ArmandoDukelsky, J.Arias, J. M.2023-06-202023-06-2020131. See for a recent review, D. Jaksch and P. Zoller, Ann. Phys. 315, 52 (2005). 2. S. Pethick, Bose-Einstein Condensation in Dilute Gases, Cambridge, 2002. 3. J. P. Blaizot and G. Ripka, Quantum Theory of Finite Systems, The MIT Press, 1986. 4. A. Relaño, J. Dukelsky, P. Pérez-Fernández, and J.M. Arias, to be published.978-0-7354-1165-410.1063/1.4810840https://hdl.handle.net/20.500.14352/45631© 2013 AIP Publishing. La Rabida 2012 International Scientific Meeting on Nuclear Physics (2013. La Rábida (España).The Bose-Hubbard model coupled to a Feshbach resonance is studied. Quantum phase transitions are analyzed within a beyond mean field framework in order to get finite size corrections to the simple mean field approach. Analytical results for the ground state energy and the first few energy gaps are presented.engbook parthttp://dx.doi.org/10.1063/1.4810840http://scitation.aip.org/open access536Dilute gasesQuantum phase transitionsMean field techniques and beyondFísica (Física)22 Física