Weak solutions of the three-dimensional hypoviscous elastodynamics with finite kinetic energy

We construct weak solutions to the 3D hypoviscous incompressible elastodynamics with finite kinetic energy which was unknown in literatures. Our result holds for fractional hypoviscosity $(-\mathrm{\Delta }{)}^{\theta }$, where $0\le \theta <1$. The proof {consists of a convex integration scheme with new building blocks of 2D intermittency and suitable temporal correctors, which are motivated by} the inherent geometric structure of the viscoelastic equations.