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Automorphisms of solenoids and p-adic entropy (1988)
Journal Article
Lind, D., & Ward, T. (1988). Automorphisms of solenoids and p-adic entropy. Ergodic Theory and Dynamical Systems, 8(3), 411-419. https://doi.org/10.1017/s0143385700004545

We show that a full solenoid is locally the product of a euclidean component and p-adic components for each rational prime p. An automorphism of a solenoid preserves these components, and its topological entropy is shown to be the sum of the euclidea... Read More about Automorphisms of solenoids and p-adic entropy.

Solutions of Minkowskian $\sigma$ Models on Hyperbolic Complex Grassmann Manifolds. (1988)
Journal Article
Lambert, D., & Piette, B. (1988). Solutions of Minkowskian $\sigma$ Models on Hyperbolic Complex Grassmann Manifolds. Classical and Quantum Gravity, 5(2), 307-319. https://doi.org/10.1088/0264-9381/5/2/010

The authors define two-dimensional Minkowskian sigma models valued in hyperbolic complex Grassmann manifolds. They construct a different kind of solution using hyperbolic analytic functions. They exhibit graphs of a few explicit solutions.

VIRASORO ALGEBRAS WITH CENTRAL CHARGE c < 1 (1987)
Presentation / Conference Contribution
Bowcock, P., & Goddard, P. (1987). VIRASORO ALGEBRAS WITH CENTRAL CHARGE c < 1. Nuclear Physics B, B285, 651-670. https://doi.org/10.1016/0550-3213%2887%2990360-9

It is known that, given an algebra and a subalgebra, g ⊃ h, the difference of the Sugawara constructions of the Virasoro algebras associated with the corresponding Kac-Moody algebras ĝ ⊃ ĥ defines another Virasoro algebra, v̂, and also that if the ce... Read More about VIRASORO ALGEBRAS WITH CENTRAL CHARGE c < 1.