13,998 research outputs found
Inflation Targeting With Special Review on Appliction in Serbia
Inflation targeting represents monetary regime primarily applied in New Zealand in 1989. Since then, this regime has extended into over 30 countries and it is recommended by International Monetary Fund within its business arrangements in last couple of years. The last country that announced this regime was Serbia. It is regularly introduced when previous one had poor performances. Its nature is determined by targeted inflation rate, high level of transparency in monetary policies conducting, absence of secondary goals, as well as responsibility for realized targeted inflation rates. Within work, theoretical presumptions are analyzed regarding implementation of this regime, and the most important aspects of its functioning in chosen countries, and its application in Serbia is a subject of particular consideration.Inflation targeting, Monetary policy, Serbia, Transparency
Gravitational waves in a stringlike fluid cosmology
The coupling of a stringlike fluid with ordinary matter and gravity may lead
to a closed Universe with the dynamic of an open one. This can provide an
alternative solution for the age and horizon problems. A study of density
perturbations of the stringlike fluid indicates the existence of instabilities
in the small wavelength limit when it is employed a hydrodynamic approach.
Here, we extend this study to gravitational waves, where the hydrodynamical
approach plays a less important role, and we argue that traces of the existence
of this fluid must be present in the anisotropies of the cosmic background
radiation.Comment: Latex, 8 page
Ruling out the Modified Chaplygin Gas Cosmologies
The Modified Chaplygin Gas (MCG) model belongs to the class of a unified
models of dark energy (DE) and dark matter (DM). It is characterized by an
equation of state (EoS) , where the case
corresponds to the Generalized Chaplygin Gas (GCG) model. Using a perturbative
analysis and power spectrum observational data we show that the MCG model is
not a sucessful candidate for the cosmic medium unless . In this case, it
reduces to the usual GCG model.Comment: Latex file, 7 pages, 6 figures in eps forma
Scalar field black holes
With a suitable decomposition of its energy-momentum tensor into pressureless
matter and a vacuum type term, we investigate the spherical gravitational
collapse of a minimally coupled, self-interacting scalar field, showing that it
collapses to a singularity. The formed blackhole has a mass (in
Planck units), where is the mass of the scalar field. If the latter has the
axion mass, eV, the former has a mass .Comment: 8 pages, no figure
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