2,857 research outputs found
Braneworld solutions for F(R) models with non-constant curvature
This work deal with braneworld scenarios with generalized gravity. We
investigate models where the potential of the scalar field is polynomial or
nonpolynomial. We obtain exact and approximated solutions for the scalar field,
warp factor and energy density, in the complex scenario with no restriction on
the scalar curvature. In particular, we describe the case where the brane may
split, engendering internal structure, with the splitting caused by the same
parameter that controls deviation from standard gravity.Comment: 9 pages, 7 figures; new versio
Nonlinear dynamics within macroeconomic factors and stock market in Portugal 1993-2003
The main objective of this paper is to assess how mutual information as a measure of global dependence between stock markets and macroeconomic factors can overcome some of the weaknesses of the traditional linear approaches commonly used in this context. One of the advantages of mutual information is that it does not require any prior assumption regarding the specification of a theoretical probability distribution or the specification of the dependence model. This study focuses on the Portuguese stock market where we evaluate the relevance of the macroeconomic and financial variables as determinants of the stock prices behaviour
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