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In Ref. [1] (by J. Alexandre) a minimal extension of (3+1)-dimensionalQuantum Electrodynamics has been proposed, which includes Lorentz-Violation(LV) in the form of higher-(spatial)-derivative isotropic terms in the gaugesector, suppressed by a mass scale $M$. The model can lead to dynamical massgeneration for charged fermions. In this article I elaborate further on thisidea and I attempt to connect it to specific quantum-gravity models, inspiredfrom string/brane theory. Specifically, in the first part of the article, Icomment briefly on the gauge dependence of the dynamical mass generation in theapproximations of [1], and I propose a possible avenue for obtaining the truegauge-parameter-independent value of the mass by means of Pinch Techniqueargumentations. In the second part of the work I embed the LV QED model intomultibrane world scenarios with a view to provide a geometrical way ofenhancing the dynamical mass to phenomenologically realistic values by means ofbulk warp metric factors, in an (inverse) Randall-Sundrum hierarchy. Finally inthe third part of this note, I demonstrate that such Lorentz Violating QEDmodels may represent parts of a low-energy effective action (ofFinsler-Born-Infeld type) of open strings propagating in quantum D0-particlestochastic space-time foam backgrounds, which are viewed as consistent quantumgravity configurations.

Quantum-Gravity Induced Lorentz Violation and Dynamical Mass Generation