SHORT TALKS

A. De Martino
Universita' di Roma La Sapienza
Statistical mechanics of Von Neumann's growth problem

L. Leuzzi
Universita' di Roma La Sapienza
Spin model for inverse freezing in amorphous materials

J. Lukic
Universita' di Roma La Sapienza
Plaquette disorder in Villain's fully frustrated model:
a very relevant perturbation

A. Maiorano
Universita' di Roma La Sapienza and BIFI Zaragoza
Ianus: an adaptive, biprogrammable FPGA computer

G. Mongillo
Institute of Cognitive Science, Bron,
Mean-field for non hamiltonian systems of coupled
dynamical elements - lessons from neural networks

T. Sasamoto,
Tokyo Institute of Technology,
Spatial correlations of 1D KPZ surface

G. Semerjian,
Universita' di Roma La Sapienza
Counting loops in random graphs and real-world networks

K. Takeda,
Tokyo Institute of Technology,
Conjecture for multicritical points in mutually-dual
spin glasses

F. Zamponi
Universita' di Roma La Sapienza
The ideal glass transition of hard spheres

ABSTRACTS

L. Leuzzi
Spin model for inverse freezing in amorphous materials
We analyze the Blume-Emery-Griffiths model with disordered
magnetic interaction that displays the inverse freezing
phenomenon. The behavior of this spin-1 model in crystal field is
studied throughout the phase diagram and the transition and
spinodal lines for the model are computed using the Full Replica
Symmetry Breaking Ansatz that always yields a thermodynamically
stable phase.  We compare the results both with the formulation of
the same model in terms of Ising spins on lattice gas, where no
reentrance takes place, and with the model with generalized spin
variables recently introduced by Schupper and Shnerb
[Phys. Rev. Lett. {\bf 93} 037202 (2004)], for which the
reentrance is enhanced as the ratio between the degeneracy of full
to empty sites increases. The simplest version of all these
models, known as the Ghatak-Sherrington model, turns out to hold
all the general features characterizing an inverse transition to
an amorphous phase, including the right thermodynamic behavior.