The Co-varying Physical Couplings (CPC) framework is a modified gravity set up assuming Einstein Field Equations wherein the quantities $\{G,c,\Lambda\}$ are promoted to space-time functions. Bianchi identity and requirement of stress-energy tensor conservation entangle possible variations couplings $\{G,c,\Lambda\}$, which forced co-vary as dictated by General Constraint (GC). In this paper we...

Time varying parameter (TVP) models have enjoyed an increasing popularity in empirical macroeconomics. However, TVP models are parameter-rich and risk over-…tting unless the dimension of the model is small. Motivated by this worry, this paper proposes several Time Varying dimension (TVD) models where the dimension of the model can change over time, allowing for the model to automatically choose...

This thesis considers the problem of recognizing human faces despite variations in illumination, pose and contiguous occlusion, using only frontal training images. In particular, we are interested in simultaneously handling multiple modes of variability in automatic face recognition. We first propose a very simple algorithm, called Nearest-Subspace Patch Matching, which combines a local transla...

Background Contractile function of the ex vivo, isolated left atrium (LA) has been described by a time-varying elastance, but this atrial chamber property has not been shown in vivo. Methods and Results Instantaneous LA pressure-volume (P-V) relations were studied in 12 anesthetized, autonomically blocked, atrially paced dogs. LA volume was calculated from orthogonal sonomicrometer pairs using ...

In generating textual summaries of data, the content determination problem is even more complicated when summarizing time-varying data, such as in weather or stockmarket report generation. As well as the maximum, minimum and mean, what is of interest is the behaviour of the variable over time; e.g. dramatic changes, trends and degree of variability in the data. For example, in the graph of temp...

The idea of possible time or space variations of the 'fundamental' constants of nature, although not new, is only now beginning to be actively considered by large numbers of researchers in the particle physics, cosmology and astrophysics communities. This revival is mostly due to the claims of possible detection of such variations, in various different contexts and by several groups. I present ...

How strongly are foreign exchange markets linked in terms of their similarities long-run fluctuations? Are they cointegrating? To analyze such “comovements,” we present a time-varying cointegration model for the rates currencies Canada, Japan, and UK vis-à-vis U.S. dollar from May 1990 through July 2015. Unlike previous studies, allow loading matrix vector error-correction (VEC) to be varying o...

this paper studies the effect of considering time varying skewness and kurtosis on the estimation of value at risk (var) for both long and short positions using the hyaparch model and daily data for tehran stock exchange price index (tepix). our results show that applying conditional distributions with time varying or constant skewness and degrees of freedom is able to capture the asymmetry app...