The unconstrained reduced action corresponding to the dynamics of scalarfluctuations about the Friedmann-Robertson-Walker (FRW) background is derivedusing Dirac's method of description of singular Lagrangian systems. The resultsare applied to so-called negative mode problem in description of tunnelingtransitions with gravity. With our special choice of physical variable, thekinetic term of the reduced action has a conventional signature for a wideclass of models. In this representation, the existence of a negative modejustifying the false vacuum decay picture turns out to be manifest. We alsoexplain how the present result becomes consistent with the previously proved``no negative mode (supercritical supercurvature mode) theorem''.
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