Nonlinear hydrodynamics is used to evaluate disorder-induced corrections to
the vortex liquid tilt modulus for finite screening length and arbitrary
disorder geometry. Explicit results for aligned columnar defects yield a
criterion for locating the Bose glass transition line at all fields.Comment: 8 pages, 2 figures. Contributed talk at the First ESF-Vortex Matter
Conference in Agia Pelagia, Crete, September 199