K-essence with a Polynomial Equation of State
Kaluza-Klein equations, Einstein's equations, and an effective energy-momentum tensor.
Kantowski-Sachs cosmological models as big-bang models
Kerr black holes in a magnetic universe
Killing Horizons and Orthogonally Transitive Groups in Space-Time
Killing tensors in two-dimensional space-times with applications to cosmology.
Killing vector fields in self-dual, Euclidean Einstein spaces with Λ≠0.
Korteweg-de Vries hierarchy as an asymptotic limit of the Boussinesq system