Variational methods and effective actions in string models

Dereli, Tekin and Tucker, Robin (1987) Variational methods and effective actions in string models. Classical and Quantum Gravity, 4 (4). pp. 791-797. ISSN 0264-9381

Abstract

Effective actions motivated by zero-order and first-order actions are examined. Particular attention is devoted to a variational procedure that is consistent with the structure equations involving the Lorentz connection. Attention is drawn to subtleties that can arise in varying higher-order actions and an efficient procedure developed to handle these cases using the calculus of forms. The effect of constrained variations on the field equations is discussed.