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We consider Lagrangians in 3+1 dimensions admitting topological defects wherethere is an additional coupling between the defect scalar field $\Phi$ and thegauge field kinetic term (eg $B(\vert \Phi \vert^2) F_{\mu \nu}F^{\mu \nu}$).Such a {\it dilatonic} coupling in the context of a static defect, induces aspatially dependent effective gauge charge and effective mass for the scalarfield which leads to modified properties of the defect core. In particular, thescale of the core gets modified while the stability properties of thecorresponding embedded defects are also affected. These modifications areillustrated for gauged (Nielsen-Olesen) vortices and for gauged ('tHooft-Polyakov) monopoles. The corresponding dilatonic global defects are alsostudied in the presence of an external gauge field.

Dilatonic Topological Defects in 3+1 Dimensions and their Embeddings