TSST — Tareq Spacetime Stability Theory: A Covariant Geometric Mechanism for Quantum Behavior, Dark Matter, Dark Energy, and the Cosmological Bounce

TSST (Tareq Spacetime Stability Theory) is a fully covariant geometric framework in which quantum behavior, classicality, dark matter phenomena, cosmic acceleration, and the early-universe bounce arise from a single instability scalar constructed from the Weyl curvature. The theory introduces only two new constants—a fundamental length scale ℓ0\ell_0ℓ0 and a dimensionless shape parameter β\betaβ—and modifies the gravitational action through a stability-response function f(S)=S2(1+βS)f(\mathcal{S}) = \mathcal{S}^2(1+\beta\mathcal{S})f(S)=S2(1+βS). This produces quantum-like behavior at high curvature instability, classical behavior at low instability, galaxy rotation curves without dark matter particles, dark-energy-like acceleration at large scales, and a non-singular cosmological bounce. TSST remains fully geometric, diffeomorphism-invariant, and compatible with General Relativity in stable curvature regimes.