Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS, 2026 (SCI-Expanded, Scopus)
The resolution of cosmological singularities remains a central challenge in the physics of the dark Universe, where dissipative effects may provide a natural alternative to exotic matter fields. We demonstrate that causal bulk-viscous fluids, governed by the Israel-Stewart theory, can generate non-singular cosmological bounces that remain stable and thermodynamically consistent. Starting from the Eckart no-go theorem, we derive analytical bounce conditions and confirm their validity through numerical integrations of parametrized scale factors. The finite relaxation time induces a controlled violation of the null energy condition while ensuring positive entropy production and finite viscous pressure at the bounce. When extended to f(R) gravity and Loop Quantum Cosmology (LQC), higher-curvature and quantum-geometry corrections further enhance the robustness of these causal bounces. The framework thereby establishes dissipative transport as a physically motivated mechanism for singularity resolution, potentially linking early-Universe dynamics to observable imprints on primordial perturbations.