Abstract
Explicit solutions of the perturbed Einstein-Maxwell-dilaton-axion theory are obtained by means of complex scalar potentials in the case when the background geometry is the spacetime corresponding to plane waves in the regions prior to the collision. These expressions are derived using Wald’s method of adjoint operators and a decoupled system of equations; no gauge-fixing condition on the perturbed tetrad is imposed. Our results cover the low energy limit of string theory for some fixed values of the dilaton coupling constants. The existence of purely incoming perturbations is discussed.
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