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We study effect of the adiabatic electron renormalization on the parametersof the dynamical defects in the ballistic metallic point contact. The upperenergy states of the ``dressed'' defect are shown to give a smallercontribution to a resistance of the contact than the lower energy ones. Thisholds both for the "classical" renormalization related to defect coupling withaverage local electron density and for the "mesoscopic" renormalization causedby the mesoscopic fluctuations of electronic density the dynamical defects arecoupled with. In the case of mesoscopic renormalization one may treat thedynamical defect as coupled with Friedel oscillations originated by the otherdefects, both static and mobile. Such coupling lifts the energy degeneracy ofthe states of the dynamical defects giving different mesoscopic contribution toresistance, and provides a new model for the fluctuator as for the objectoriginated by the electronic mesoscopic disorder rather than by the structuralone. The correlation between the defect energy and the defect contribution tothe resistance leads to zero-temperature and zero-bias anomalies of the pointcontact resistance.  A comparison of these anomalies with those predicted by the Two Channel KondoModel (TCKM) is made. It is shown, that although the proposed model is based ona completely different from TCKM physical background, it leads to a zero-biasanomalies of the point contact resistance, which are qualitatively similar toTCKM predictions.Comment: 6 pages, to be published in Phys. Rev.

Zero-bias anomaly of point-contact resistance due to adiabatic electron renormalization of dynamical defects