AdS space compactification and holographic mapping in the AdS/CFT correspondence

Physical consistency of quantum fields in anti-de Sitter space time requires that the space must be compactified by the inclusion of a boundary where appropriate conditions are imposed. An interpretation for the presence of this boundary is found taking AdS as a limiting case of the space generated by a large number of coincident branes. The compactification of AdS leads to a discretization of the spectrum of bulk fields. As a consequence, we find a one to one mapping between the quantum states of scalar fields in AdS bulk and boundary. Using this mapping as an approximation for the dual relation between string dilaton field and scalar QCD glueballs the high energy QCD scaling is reproduced. We also use this map to estimate the ratio of scalar glueball masses.Comment: 5 pages, talk presented at "Renormalization Group and Anomalies in Gravity and Cosmology", Ouro Preto, Brazil, March 200

QCD/String holographic mapping and high energy scattering amplitudes

We find a one to one mapping between low energy string dilaton states in AdS bulk and high energy glueball states on the corresponding boundary. This holographic mapping leads to a relation between bulk and boundary scattering amplitudes. From this relation and the dilaton action we find the appropriate momentum scaling for high energy QCD amplitudes at fixed angles.Comment: Minor changes in text. Version accepted for publication in PL

Does one monetary policy fit all? the determinants of inflation in EMU countries

This chapter aims at assessing the long-run determinants and the short-run dynamics of inflation in each country belonging to the European Monetary Union (EMU). Our work complements the recent literature on this topic for the Euro Area as a whole. Detecting such determinants can be crucial in designing structural reforms acting as aside instruments of monetary policy in maintaining price stability. The empirical methodology consists of a reinterpretation of the structural cointegrating VAR approach, which allows for a structural long-run analysis of inflation determinants along with an accurate assessment of its short-run dynamics. The main conclusion emerging from the estimates is that not only the determinants of inflation differ in the countries belonging to the Euro Area, but also that cost-push factors have a considerable role in explaining inflation in most of the countries examined. As a policy implication, a tight monetary policy pursued in those countries whose inflation is mainly driven by costs would result in a contraction of economic activity without exerting relevant effects on price dynamics.Inflation, markup, EMU countries, long-run structural VARs, subset VEC models

Faddeev-Jackiw formalism for a topological-like oscillator in planar dimensions

The problem of a harmonic oscillator coupling to an electromagnetic potential plus a topological-like (Chern-Simons) massive term, in two-dimensional space, is studied in the light of the symplectic formalism proposed by Faddeev and Jackiw for constrained systems.Comment: 17 pages, Latex file, to appear in Mod. Phys. Let.

International capital flows and transmission of financial crises

This paper proposes a model encompassing alternative views of contagion by highlighting the different channels of transmission of financial crises in an unifying framework. We study investor behaviour when they are affected by external habit formation. It is shown how international portfolio choice in frictionless financial markets with habit formation is in itself a channel of contagion. The possible stabilization effects of capital controls and Tobin tax on the international transmission of financial crises are also discussedCurrency crises; contagion; habit formation; portfolio rebalancing; capital controls; Tobin tax