The Eurozone crisis and its effects on citizens' trust in national parliaments. CEPS Commentary, 8 December 2010

Citing evidence that the levels of net trust in the national parliaments have dropped to -50% in three of the four troubled periphery eurozone countries (Ireland, Spain and Greece), this Commentary warns that the European and national policy-makers’ strategy of the three no’s – no bail-out, no default and no exit –appears to threaten political stability in these countries

Trust and Economic Growth: Conflicting Results between Cross-Sectional and Panel Analysis

This paper examines the relationship between trust and economic growth. With the help of panel data I conclude that economic growth is negatively related to an increase in trust. My result is contrary to works taking a cross section design in which trust is positively related to growth. The relationship is tested in the context of EU countries, OECD countries, transition countries and developing countries. Interpersonal trust and systemic trust is differentiated.Social Capital; Trust; Economic Growth; Panel Analyis

Phase Diagram of Bosons in Two-Color Superlattices from Experimental Parameters

We study the zero-temperature phase diagram of a gas of bosonic 87-Rb atoms in two-color superlattice potentials starting directly from the experimental parameters, such as wavelengths and intensities of the two lasers generating the superlattice. In a first step, we map the experimental setup to a Bose-Hubbard Hamiltonian with site-dependent parameters through explicit band-structure calculations. In the second step, we solve the many-body problem using the density-matrix renormalization group (DMRG) approach and compute observables such as energy gap, condensate fraction, maximum number fluctuations and visibility of interference fringes. We study the phase diagram as function of the laser intensities s_2 and s_1 as control parameters and show that all relevant quantum phases, i.e. superfluid, Mott-insulator, and quasi Bose-glass phase, and the transitions between them can be investigated through a variation of these intensities alone.Comment: 4 pages, 3 figure

Ultracold Bose gases in time-dependent 1D superlattices: response and quasimomentum structure

The response of ultracold atomic Bose gases in time-dependent optical lattices is discussed based on direct simulations of the time-evolution of the many-body state in the framework of the Bose-Hubbard model. We focus on small-amplitude modulations of the lattice potential as implemented in several recent experiment and study different observables in the region of the first resonance in the Mott-insulator phase. In addition to the energy transfer we investigate the quasimomentum structure of the system which is accessible via the matter-wave interference pattern after a prompt release. We identify characteristic correlations between the excitation frequency and the quasimomentum distribution and study their structure in the presence of a superlattice potential.Comment: 4 pages, 4 figure

The financial crisis and citizens' trust in the European Central Bank

Trust in the ECB, as measured by the standard Eurobarometer surveys has fallen to unprecedented lows - especially in the larger euro area countries. We find that up to the start of the recession in 2008 trust in the ECB was little affected by business cycle variables such as growth and even inflation. This changed radically with the recession, with trust in the ECB being correlated quite closely with growth. However, even the recovery of growth in 2009 was not sufficient to restore trust in the ECB to previous levels. This finding implies that European citizens seem to have heavily blamed the European Central Bank for the real economic downturn caused by the financial crisis

The Europe 2020 Strategy: Can it maintain the EU’s competitiveness in the world? CEPS Paperbacks. September 2012

Launched in March 2010 by the European Commission, the Europe 2020 strategy aims at achieving “smart, sustainable and inclusive” growth. This growth is intended to be driven by three sets of engines: knowledge and innovation, a greener and more efficient use of resources and higher employment combined with social and territorial cohesion. This CEPS report takes an in-depth look at the Europe 2020 strategy and the goals it sets for the EU, with the aim of shedding light on the question of whether the strategy will succeed in fostering the global competitiveness of the European Union. While finding that the Europe 2020 strategy identifies the right key indicators for its targets, the authors advise that it should be revised in several important respects and conclude with relevant policy steps to foster the future capability of European economies and their prosperity

Response of Bose gases in time-dependent optical superlattices

The dynamic response of ultracold Bose gases in one-dimensional optical lattices and superlattices is investigated based on exact numerical time evolutions in the framework of the Bose-Hubbard model. The system is excited by a temporal amplitude modulation of the lattice potential, as it was done in recent experiments. For regular lattice potentials, the dynamic signatures of the superfluid to Mott-insulator transition are studied and the position and the fine-structure of the resonances is explained by a linear response analysis. Using direct simulations and the perturbative analysis it is shown that in the presence of a two-colour superlattice the excitation spectrum changes significantly when going from the homogeneous Mott-insulator the quasi Bose-glass phase. A characteristic and experimentally accessible signature for the quasi Bose-glass is the appearance of low-lying resonances and a suppression of the dominant resonance of the Mott-insulator phase.Comment: 20 pages, 9 figures; added references and corrected typo