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  • Kar, S; Maharana, J; Singh, H

    arXiv.org, 02/1996
    Paper

    The S-duality invariance of the equations of motion of four dimensional string effective action with cosmological constant, \(\Lambda \), is studied. It is demonstrated that the S-duality symmetry of the field equations are broken for nonzero \(\Lambda\). The ``naturalness'' hypothesis is invoked to argue that \(\Lambda \) should remain small since exact S-duality symmetry will force the cosmological constant to vanish in the string effective action.