4 papers
Fermions without fermi fields
R. C. Ball
It is shown that an arbitrary Fermion hopping hamiltonian can be represented by a system with no fermion fields, generalising earlier results by M. Levin & X.G. Wen [Phys Rev B 67,…
Universality in snowflake aggregation
C. D. Westbrook, R. C. Ball, P. R. Field +1
Aggregation of ice crystals is a key process governing precipitation. Individual ice crystals exhibit considerable diversity of shape, and a wide range of physical processes could…
Effects of Non-local Stress on the Determination of Shear Banding Flow
C. -Y. David Lu, Peter D. Olmsted, R. C. Ball
We analyze the steady planar shear flow of the modified Johnson-Segalman model, which has an added non-local term. We find that the new term allows for unambiguous selection of the…
The Stress Transmission Universality Classes of Periodic Granular Arrays
R. C. Ball, D. V. Grinev
The transmission of stress is analysed for static periodic arrays of rigid grains, with perfect and zero friction. For minimal coordination number (which is sensitive to friction,…