Second Variations of String Actions

Mark D. Roberts

A short article describing the derivation of the string deviation equation: ${\dot{\Pi }}_{\tau }^{\nu }+{\Pi }_{\sigma }^{\prime \mu }=R_{.\alpha \beta \gamma }^{\nu }{r}^{\gamma }(P_{\tau }^{\beta }{\dot{x}}^{\alpha }+P_{\sigma }^{\beta }{x}^{\prime \alpha })$.