String theory

**Title**: Unified Duality in String Theory: A Coherence-Based Framework for Multidimensional Integration **Description**: This paper presents a novel formulation of string theory duality through the introduction of a coherence field—proposed as a unifying fifth fundamental force. By reconciling T-duality, S-duality, and mirror symmetry under a coherence-based topology, the framework extends the current understanding of dimensional interplay and brane dynamics. This duality not only supports a unified theory of quantum gravity but also suggests a higher-dimensional symmetry architecture linking superstrings and M-theory. The approach integrates insights from cosmology, frequency harmonics, and field entanglement, offering an elegant path forward in reconciling the inconsistencies between general relativity and quantum mechanics. The work invites theoretical verification, simulation-based exploration, and interdisciplinary review, particularly in the fields of advanced geometry and quantum field coherence.