Study of dynamical supersymmetry breaking for the two dimensional lattice Wess-Zumino model

A new approach to the study of the transition point in a class of two dimensional Wess-Zumino models is presented. The method is based on the calculation of rigorous lower bounds on the ground state energy density in the infinite lattice limit. Such bounds are useful in the discussion of supersymmetry phase transition. The transition point is then determined and compared with recent results based on large-scale Green Function Monte Carlo simulations with good agreement.Comment: 4 pages, 1 figure, Talk presented at Quark Confinement and the Hadron Spectrum VI, Villasimius, Sardinia, Italy, September 21-25, 200

Dynamical supersymmetry breaking and phase diagram of the lattice Wess-Zumino model

We study dynamical supersymmetry breaking and the transition point by non-perturbative lattice techniques in a class of two-dimensional N=1 Wess-Zumino model. The method is based on the calculation of rigorous lower bounds on the ground state energy density in the infinite-lattice limit. Such bounds are useful in the discussion of supersymmetry phase transition. The transition point is determined with this method and then compared with recent results based on large-scale Green Function Monte Carlo simulations with good agreement.Comment: 6 pages, 4 figs. Lattice2005 (theory), uses Po

Highest states in light-cone AdS5×S5AdS_5\times S^5 superstring

We study the highest states in the compact rank-1 sectors of the AdS5 X S5 superstring in the framework of the recently proposed light cone Bethe Ansatz equations. In the su(1|1) sector we present strong coupling expansions in the two limits L,lambda -> OO (expanding in power of lambda^{-1/4} with fixed large L) and lambda, L -> OO (expanding in power of 1/L with fixed large lambda) where lambda is the 't Hooft coupling and L is the number of Bethe momenta. The two limits do not commute apart from the leading term which reproduces the result obtained with the Arutyunov-Frolov-Staudacher phase in the lambda, L -> OO limit. In the su(2) sector we perform the strong coupling expansions in the L->OO limit up to O(lambda^{-1/4}), and our result is in agreement with previuos String Bethe Ansatz analysis.Comment: 33 pages, 3 eps figure

Evolution of fermionic systems as an expectation over Poisson processes

We derive an exact probabilistic representation for the evolution of a Hubbard model with site- and spin-dependent hopping coefficients and site-dependent interactions in terms of an associated stochastic dynamics of a collection of Poisson processes.Comment: 4 pages, contribution to the proceedings of tenth International Conference on Recent Progress in Many-Body Theories, Seattle, 199

On the wrapping correction to single magnon energy in twisted N=4 SYM

We apply Zeilberger summation to derive a closed formula for the wrapping correction to one-impurity states in the su(2) sector of the beta-deformed N=4 SYM theory at beta=1/2. As an application depending heavily on the result, we compute the large volume expansion of the wrapping correction.Comment: 15 page

Nanoscale electron-beam-driven metamaterial light sources

Free-standing and fiber-coupled photonic metamaterials act as nanoscale, free-electron-driven, tuneable light sources: emission occurs at wavelengths determined by structural geometry in response to electron-beam excitation of metamaterial resonant plasmonic modes

Analysis of the Seismic Risk of Major-Hazard Industrial Plants and Applicability of Innovative Seismic Protection Systems

In this paper the main results obtained within different research projects, developed about the applicability of seismic passive control of major-hazard industrial installations are shown. The work concerns the main components of a refinery that have been classified and collected into a limited number of classes on the basis of the geometrical and mechanical characteristics. For each class, the main damages caused by past earthquakes have been described and the most vulnerable component have been identified. Finally, a synthesis of the effects of earthquakes on the different typology of process components has been carried out and the most suitable innovative seismic protection systems, in particular of passive type, have been recognized. Finally an example of using dissipative coupling between a distillation column and an adjacent service frame is illustrated

Considerations on dynamic soaring

This paper presents an analytical treatment of dynamic soaring, a behaviour that certain sea birds use to extract energy from wind gradient. Theoretical modeling and results of numerical simulations, based on a two-degrees-of-freedom point mass model, are presented

METHODS FOR OBTAINING. HOLLOW NANO-STRUCTURES

Methods are provided for obtaining hollow nano-structures which include the steps of providing a Suspended film starting layer on a Support Substrate, depositing on the starting layer a sacrificial layer, performing, in progressive sequence, a com plete erosion phase of said Support Substrate and starting layer and performing an at least partial erosion phase of the sacri ficial layer previously deposited on the starting layer so as to obtain holes passing through the starting layer and passing or non passing through the sacrificial layer, depositing, on the side of the support substrate opposite to that where the start ing layer is put, at least one covering layer arranged to inter nally cover the holes created by the progressive erosion. Hol low nano-structures formed by Such methods are also provided

A Survey of Trust Management Models for Cloud Computing

Over the past few years, cloud computing has been widely adopted as a paradigm for large-scale infrastructures. In such a scenario, new security risks arise when different entities or domains share the same group of resources. Involved organizations need to establish some kind of trust relationships, able to define appropriate rules that can control which and how resources and services are going to be shared. The management of trust relationships represents a key challenge in order to meet high security requirements in cloud computing environments. This allows also to boost consumers confidence in cloud services, promoting its adoption. Establishing trust with cloud service providers supports to have confidence, control, reliability, and to avoid commercial issues like lock in. This paper proposes a survey of existing trust management models addressing collaboration agreements in cloud computing scenarios. Main limitations of current approaches are outlined and possible improvements are traced, as well as a future research path