  We consider a possibility that the recent OPERA results on neutrinos'
superluminality could be caused by a local effect of a new gauge field sourced
by the earth. If neutrinos couple to this gauge field via a gauge-invariant but
non-renormalizable interaction, the coupling effectively changes a background
metric, thereby leading to superluminality of neutrinos. This possibility
naturally might explain why neutrinos from CERN CNGS beam to Gran Sasso
Laboratory become superluminal while those from SN1987A to Earth become
subluminal.
