The cold plus hot dark matter (CHDM) model is arguably the best theory we currently have for a consistent description of the observed large scale structure formation. This is especially true if the primordial density fluctuations are assumed to be essentially scale invariant, in which case a mixture with 20-25 % HDM, 510 % baryons, and the rest in CDM correctly predicted (in 1989) the quadrupol...

The effect of bulk viscisity on the evolution of the homogeneous and isotropic cosmological models is considered. Solutions are found, with a barotropic equation of state, and a viscosity coefficient that is proportional to a power of the energy density of the universe. For flat space, power law expansions, related to extended inflation are found as well as exponential solutions, related to old...

If the source of the current accelerating expansion of the universe is a positive cosmological constant, Banks and Fischler argued that there exists an upper limit of the total number of e-foldings of inflation. We further elaborate on the upper limit in the senses of viewing the cosmological horizon as the boundary of a cavity and of the holographic Dbound in a de Sitter space. Assuming a simp...

We use noncausal autoregressions to examine the persistence properties of quarterly U.S. consumer price inflation from 1970:1—2012:2. These nonlinear models capture the autocorrelation structure of the inflation series as accurately as their conventional causal counterparts, but they allow for persistence to depend on the size and sign of shocks to inflation as well as the inflation rate. Infla...

In the context of a five–dimensional brane–world model motivated from heterotic M–theory, we develop a framework for potential–driven brane–world inflation. Specifically this involves a classification of the various background solutions of (A)dS5 type, an analysis of five–dimensional slow–roll conditions and a study of how a transition to the flat vacuum state can be realized. It is shown that ...

The purpose of this analytical review was to estimate the direct and indirect economic costs of physical inactivity and obesity in Canada in 2001. The relative risks of diseases associated with physical inactivity and obesity were determined from a meta-analysis of existing prospective studies and applied to the health care costs of these diseases in Canada. Estimates were derived for both the ...

high inflation has been as one of the characteristics of developing countries including iran and its economic and social impacts are extensive. compiling policies for economic development requires that inflation impacts on different social classes should be studied carefully. microeconomic analyses show that because of higher increase in price of goods that have higher share in consumption bund...

This study aimed to (a) assess the relationship between a person's occupational category and their physical inactivity, and (b) analyze the association among country-level variables and physical inactivity. The World Health Survey (WHS) was administered in 2002-2003 among 47 low- and middle-income countries (n = 196,742). The International Physical Activity Questionnaire (IPAQ) was used to coll...

We extend the standard theory of cosmological perturbations to homogeneous but anisotropic universes. We present an exhaustive computation for the case of a Bianchi I model, with a residual isotropy between two spatial dimensions, which is undergoing complete isotropization at the onset of inflation; we also show how the computation can be further extended to more general backgrounds. In presen...

This paper considers a plethora of time-series measures of uncertainty for inflation and real output growth, which are widely used in empirical studies. Their relative performances are compared to a benchmark measure using the uncertainty measure reported by individual forecasters in the Survey of Professional Forecasters (SPF) for the period 1982-2008. The results show that the use of real-tim...