Comment on higher derivative Lagrangians in relativistic theory [PDF]
Mathieu BeauWe discuss the consequences of higher derivative Lagrangians of the form $\lambda_2 G_{\mu}\ddot{x}^\mu$, $\lambda_3 B_{\mu}\dddot{x}^\mu$, $\lambda_4 G_{\mu}\ddddot{x}^\mu$ in relativistic theory.View original: http://arxiv.org/abs/1305.5759
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