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We develop an athermal version of the shear-transformation-zone (STZ) theoryof amorphous plasticity in materials where thermal activation of irreversiblemolecular rearrangements is negligible or nonexistent. In many respects, thistheory has broader applicability and yet is simpler than its thermalpredecessors. For example, it needs no special effort to assure consistencywith the laws of thermodynamics, and the interpretation of yielding as anexchange of dynamic stability between jammed and flowing states is clearer thanbefore. The athermal theory presented here incorporates an explicitdistribution of STZ transition thresholds. Although this theory contains noconventional thermal fluctuations, the concept of an effective temperature isessential for understanding how the STZ density is related to the state ofdisorder of the system.Comment: 7 pages, 2 figures; first of a two-part serie

Athermal shear-transformation-zone theory of amorphous plastic deformation. I. Basic principles