Physics colloquium is Oct. 26 A physics colloquium is set for 4 p.m. Friday, Oct. 26, in 211 Witmer Hall. A large body of experimental evidence shows strong interaction between electrons and lattice vibrations in high Tc superconductors. Motivated by this we investigate the effect of dynamical Holstein, buckling and breathing phonons on the physics of the 2D Hubbard model at small doping using a cluster mean field approximation. The interplay of the antiferromagnetic correlations present in the system and the electron phonon coupling results in a synergistic enhancement of both polaron formation and antiferromagnetism. We find that phonons cause an apparent enhancement of the effective pairing interaction but in spite of that, the strong renormalization of the charge carriers mobility associated with polaron formation leads to a suppression of superconductivity in the region of parameter space relevant for cuprate superconductors. Coffee and cookies will be served at 3:30 p.m. in 215 Witmer Hall. -- Dr. Alexandru Macridin, Hubbard model with Phonons: superconductivity, polaron formation and isotope effect, Physics, connie_cicha@und.nodak.edu, 7-2911