co nd - m at / 9 50 50 64 15 M ay 1 99 5 Phase

ar X iv : m at h - ph / 9 80 50 04 v 1 5 M ay 1 99 8 Five - Dimensional Tangent Vectors in Space - Time

ar X iv : a lg - g eo m / 9 50 20 26 v 2 9 M ay 1 99 5 ALGEBRAIC SURFACES AND SEIBERG - WITTEN INVARIANTS

ar X iv : c on d - m at / 9 50 50 09 v 2 5 M ay 1 99 5 Magnetic Transition Temperature of ( La , Sr ) MnO 3

Using the Kondo lattice model with classical spins in infinite dimension, magnetic phase transition in the perovskite-type 3d transition-metal oxide La1−xSrxMnO3 is theoretically studied. On the Bethe lattice, the self-consistency equations are solved exactly. Curie temperatures at the region of double-exchange ferromagnetism 0.1 <∼ x <∼ 0.25 as well as the Nèel temperature at x = 0 are well re...

- th / 9 80 50 28 v 1 1 5 M ay 1 99 8 The Coulomb Interaction between Pion - Wavepackets : The π + – π − Puzzle

ar X iv : c on d - m at / 9 50 51 15 v 1 2 4 M ay 1 99 5 Dynamical solution of a model without energy barriers

In this note we study the dynamics of a model recently introduced by one of us, that displays glassy phenomena in absence of energy barriers. Using an adiabatic hypothesis we derive an equation for the evolution of the energy as a function of time that describes extremely well the glassy behaviour observed in Monte Carlo simulations.