Active Metric Control via Informational State Manipulation: Specification of a Causal-Symmetric Warp Drive

The realization of faster-than-light (FTL) travel in general relativity is usually blocked by two obstacles: the need for exotic matter and the risk of causality violation. This paper develops a class of candidate FTL solutions in the form of a warp drive sourced entirely by quantum information, within the Causal-Symmetric Informational Framework (CSIF). Instead of postulating negative energy from quantum fields, the model introduces an informational stress–energy tensor derived from a covariant k-essence–type Lagrangian and an informational equation of state in which the effective energy density is proportional to an informational conductivity and a relative-entropy–based measure of negentropy. In a minimal k-essence realization, the model achieves controlled violation of the null energy condition while keeping the sound speed luminal (cs² = 1), thus avoiding ghost and gradient instabilities. The paper specifies an Alcubierre-type warp metric whose wall region is sourced by this informational sector and derives a scaling law for the minimum relative entropy required for superluminal travel, showing that it grows quadratically with bubble radius and velocity and inversely with wall thickness. A chronology protection conjecture is formulated, based on the monotonic gradient of the informational conductivity, yielding a sufficient condition for global hyperbolicity of the warp spacetime. Overall, the work shifts the central challenge from unknown exotic matter to Planck-scale quantum-informational engineering and provides a formally consistent pathway by which FTL warp configurations can, in principle, be embedded within general relativity without abandoning its geometric structure.