Cold and Warm Denaturation of Proteins

We introduce a simplified protein model where the water degrees of freedom appear explicitly (although in an extremely simplified fashion). Using this model we are able to recover both the warm and the cold protein denaturation within a single framework, while addressing important issues about the structure of model proteins

Spectral coarse-graining of complex networks

Reducing the complexity of large systems described as complex networks is key to understand them and a crucial issue is to know which properties of the initial system are preserved in the reduced one. Here we use random walks to design a coarse-graining scheme for complex networks. By construction the coarse-graining preserves the slow modes of the walk, while reducing significantly the size and the complexity of the network. In this sense our coarse-graining allows to approximate large networks by smaller ones, keeping most of their relevant spectral properties.Comment: 4 pages, 2 figure

Putting Proteins back into Water

We introduce a simplified protein model where the solvent (water) degrees of freedom appear explicitly (although in an extremely simplified fashion). Using this model we are able to recover the thermodynamic phenomenology of proteins over a wide range of temperatures. In particular we describe both the warm and the {\it cold} protein denaturation within a single framework, while addressing important issues about the structure of model proteins.Comment: 4 Pages, 4 Figures. To appear on PR

Exchange Rate Regimes, Globalisation, and the Cost of Capital in Emerging Markets

This paper presents a multifactor asset pricing model for currency, bond, and stock returns for ten emerging markets to investigate the effect of the exchange rate regime on the cost of capital and the integration of emerging financial markets. Since there is evidence that a fixed exchange rate regime reduces the currency risk premia demanded by foreign investors, the tentative conclusion is that a fixed exchange rate regime system can help reduce the cost of capital in emerging markets.Exchange rate regimes; Development economics

Berry Phase and Ground State Symmetry in H x h Dynamical Jahn-Teller Systems

Due to the ubiquitous presence of a Berry phase, in most cases of dynamical Jahn-Teller systems the symmetry of the vibronic ground state is the same as that of the original degenerate electronic state. As a single exception, the linear H x h icosahedral model, relevant to the physics of C60 cations, is determined by an additional free parameter, which can be continuously tuned to eliminate the Berry phase from the low-energy closed paths: accordingly, the ground state changes to a totally-symmetric nondegenerate state.Comment: RevTex, 4 pages, 3 figure