The coupling of Non-linear Supersymmetry to Supergravity

We study the coupling of non-linear supersymmetry to supergravity. The goldstino nilpotent superfield of global supersymmetry coupled to supergravity is described by a geometric action of the chiral curvature superfield R subject to the constraint (R-\lambda)^2=0 with an appropriate constant \lambda. This constraint can be found as the decoupling limit of the scalar partner of the goldstino in a class of f(R) supergravity theories.Comment: 15 pages, minor changes, version to be published in EPJ

Agricultural situation report of Cyprus and the market and trade policies for fruit/vegetable and olive oil

During the last decade the Cypriot agricultural sector has been declining in terms of most indices in the economy, mainly due to the spiraling growth of tourism, as crucial investment outlays were diverted from agriculture to tourism; the most important factors of production being land and labor due to substantially higher yields accruing to both. The Domestic Resource Cost (DRC) revealed that the three products studied for the period 1997 to 2000, i.e. tomatoes, oranges and olive oil had a comparative advantage. However, the opening of the European market with EU accession led to the substantive undermining of competitiveness of agricultural products and to the reduction of the value of exports. It is believed that DRC ratios would be higher today that the ones reported, due to unchanged /decreased border prices and increased costs of tradable inputs. It is suggested that the tomato, orange and olive oil sectors will become more competitive in the European market if factors that are affecting their marketing, like differentiation of production and quality, are improved. New concepts like organic farming and products of origin are very important and may provide profitable outlets in the new globalized economy. Additionally, favorable climatic conditions are vastly for and conducive to the production of early season Mediterranean products with obvious premium attached in the market place.Domestic Resource Cost, Competitiveness, Tomatoes, Oranges, Olive Oil, International Relations/Trade,

On hadron deformation: a model independent extraction of EMR from pion photoproduction data

The multipole content of pion photoproduction at the $\Delta^+ (1232)$ resonance has been extracted from a data set dominated by recent Mainz Microtron (MAMI) precision measurements. The analysis has been carried out in the Athens Model Independent Analysis Scheme (AMIAS), thus eliminating any model bias. The benchmark quantity for nucleon deformation, $EMR = E2/M1 = E_{1+}^{3/2}/M_{1+}^{3/2}$, was determined to be $-2.5 \pm 0.4_{stat+syst}$, thus reconfirming in a model independent way that the conjecture of baryon deformation is valid. The derived multipole amplitudes provide stringent constraints on QCD simulations and QCD inspired models striving to describe hadronic structure. They are in good agreement with phenomenological models which explicitly incorporate pionic degrees of freedom and with lattice QCD calculations.Comment: 14 pages, 9 figures, 2 table

Black Hole Search with Finite Automata Scattered in a Synchronous Torus

We consider the problem of locating a black hole in synchronous anonymous networks using finite state agents. A black hole is a harmful node in the network that destroys any agent visiting that node without leaving any trace. The objective is to locate the black hole without destroying too many agents. This is difficult to achieve when the agents are initially scattered in the network and are unaware of the location of each other. Previous studies for black hole search used more powerful models where the agents had non-constant memory, were labelled with distinct identifiers and could either write messages on the nodes of the network or mark the edges of the network. In contrast, we solve the problem using a small team of finite-state agents each carrying a constant number of identical tokens that could be placed on the nodes of the network. Thus, all resources used in our algorithms are independent of the network size. We restrict our attention to oriented torus networks and first show that no finite team of finite state agents can solve the problem in such networks, when the tokens are not movable. In case the agents are equipped with movable tokens, we determine lower bounds on the number of agents and tokens required for solving the problem in torus networks of arbitrary size. Further, we present a deterministic solution to the black hole search problem for oriented torus networks, using the minimum number of agents and tokens