114,802 research outputs found
Convergence to equilibrium for many particle systems
The goal of this paper is to give a short review of recent results of the
authors concerning classical Hamiltonian many particle systems. We hope that
these results support the new possible formulation of Boltzmann's ergodicity
hypothesis which sounds as follows. For almost all potentials, the minimal
contact with external world, through only one particle of , is sufficient
for ergodicity. But only if this contact has no memory. Also new results for
quantum case are presented
A Finslerian version of 't Hooft Deterministic Quantum Models
Using the Finsler structure living in the phase space associated to the
tangent bundle of the configuration manifold, deterministic models at the
Planck scale are obtained. The Hamiltonian function are constructed directly
from the geometric data and some assumptions concerning time inversion
symmetry. The existence of a maximal acceleration and speed is proved for
Finslerian deterministic models. We investigate the spontaneous symmetry
breaking of the orthogonal symmetry SO(6N) of the Hamiltonian of a
deterministic system. This symmetry break implies the non-validity of the
argument used to obtain Bell's inequalities for spin states. It is introduced
and motivated in the context of Randers spaces an example of simple 't Hooft
model with interactions.Comment: 25 pages; no figures. String discussion deleted. Some minor change
Some Remarks on the Use of Deterministic and Probabilistic Approaches in the Evaluation of Rock Slope Stability
The rock slope stability assessment can be performed by means of deterministic and
probabilistic approaches. As the deterministic analysis needs only representative values (generally,
the mean value) for each physical and geo-mechanical parameter involved, it does not take into
account the variability and uncertainty of geo-structural and geo-mechanical properties of joints. This
analysis can be usually carried out using dierent methods, such as the Limit Equilibrium method or
numerical modeling techniques sometimes implemented in graphical tests to identify dierent failure
mechanisms (kinematic approach). Probabilistic methods (kinetic approach) aimed to calculate the
slope failure probability, consider all orientations, physical characters and shear strength of joints
and not only those recognized as kinematically possible. Consequently, the failure probability can
be overestimated. It is, therefore, considered more realistic to perform both kinematic and kinetic
analyses and to calculate a conditional probability given by the product of the kinematic and kinetic
probabilities assuming that they are statistically independent variables. These approaches have been
tested on two rock slopes in the Campanian region of Southern Italy aected by possible plane and
wedge failures, respectively. Kinematic and kinetic probabilities have been evaluated both by means
of the Markland’s test and the Monte Carlo simulation. Using the Eurocode 7, also a deterministic
limit equilibrium analysis was performed. The obtained results were compared and commented on
Advances and applications of automata on words and trees : abstracts collection
From 12.12.2010 to 17.12.2010, the Dagstuhl Seminar 10501 "Advances and Applications of Automata on Words and Trees" was held in Schloss Dagstuhl - Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available
Controllability Metrics on Networks with Linear Decision Process-type Interactions and Multiplicative Noise
This paper aims at the study of controllability properties and induced
controllability metrics on complex networks governed by a class of (discrete
time) linear decision processes with mul-tiplicative noise. The dynamics are
given by a couple consisting of a Markov trend and a linear decision process
for which both the "deterministic" and the noise components rely on
trend-dependent matrices. We discuss approximate, approximate null and exact
null-controllability. Several examples are given to illustrate the links
between these concepts and to compare our results with their continuous-time
counterpart (given in [16]). We introduce a class of backward stochastic
Riccati difference schemes (BSRDS) and study their solvability for particular
frameworks. These BSRDS allow one to introduce Gramian-like controllability
metrics. As application of these metrics, we propose a minimal
intervention-targeted reduction in the study of gene networks
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