Preventing eternality in phantom inflation

Preventing catastrophic filter divergence using adaptive additive inflation

Ensemble based filtering or data assimilation methods have proved to be indispensable tools in atmosphere and ocean science as they allow computationally cheap, low dimensional ensemble state approximation for extremely high dimensional turbulent dynamical systems. For sparse, accurate and infrequent observations, which are typical in data assimilation of geophysical systems, ensemble filtering...

The Relation Between Inflation and Inflation Uncertainty In Iran

2 3 Ju n 20 09 Non - minimal coupling of the phantom field and inflation

Motivated by the recent interest in phantom fields as candidates for the dark energy component, we investigate the consequences of the phantom field when is minimally coupled to gravity. In particular, the necessary (but insufficient) conditions for the acceleration and superacceleration of the universe are obtained when the non-minimal coupling term is taken into account. Furthermore, the nece...

Asymmetric Behavior of Inflation in Iran: New Evidence on Inflation Persistence Using a Smooth Transition Model

T his paper investigates the asymmetric behavior of inflation. We use logistic smooth transition autoregressive (LSTAR) model to characterize the regime-switching behavior of Iran’s monthly inflation during the period May 1990 to December 2013. We find that there is a triple relationship between the inflation level, its fluctuations and persistence. The findings imply that the behavi...

The Welfare Cost inflation in Iran

The purpose of this paper is to estimate the welfare cost of inflation in Iran. We first use the long-horizon regression approach developed by Fisher and Seater (1993) to obtain an estimate of the inflation rate elasticity of money demand and then the Baily’s consumer surplus approach to calculate the welfare cost function. The results show that reducing inflation rate from 40% to 0% increases ...