Quasinormal modes in kink excitations and kink-antikink interactions: a toy model

We study excitations and collisions of kinks in a scalar field theory where the potential has two minima with $Z_2$ symmetry. The field potential is designed to create a square well potential in the stability equation of the kink excitations. The stability equation is analogous to the Schr\"{o}dinger equation, and therefore we use quantum mechanics techniques to study the system. We modify the square well potential continuously, which allows the excitation to tunnel and consequently turns the normal modes of the kink into quasinormal modes. We study the effect of this transition, leading to energy leak, on isolated kink excitations. Finally, we investigate kink-antikink collisions and the resulting scaling and fractal structure of the resonance windows considering both normal and quasinormal modes and compare the results.Comment: 23 pages, 11 figure

Growth, Volatility and Political Instability: Non-Linear Time-Series Evidence for Argentina, 1896-2000

What is the relationship between economic growth and its volatility? Does political instability affect growth directly or indirectly, through volatility? This paper tries to answer such questions using a power-ARCH framework with annual time series data for Argentina from 1896 to 2000. We show that while assassinations and strikes (what we call “informal” political instability) have a direct negative effect on economic growth, “formal” political instability (constitutional and legislative changes) has an indirect (through volatility) negative impact. We also find preliminary support for the idea that while the effects of “formal” instability are stronger in the long-run, those of “informal” instability are stronger in the short-run.

Two to Tangle: Financial Development, Political Instability and Economic Growth in Argentina (1896–2000)

This paper investigates the effects of financial development and political instability on economic growth in a power-ARCH framework with data for Argentina from 1896 to 2000. Our findings suggest that (i) informal or unanticipated political instability (e.g., guerrilla warfare) has a direct negative impact on growth; (ii) formal or anticipated instability (e.g., cabinet changes) has an indirect (through volatility) impact on growth; (iii) the effect of financial development is positive and, surprisingly, not via volatility; (iv) the informal instability effects are much larger in the short- than in the long-run; and (v) the impact of financial development on economic growth is negative in the short- but positive in the long-run.economic growth, financial development, volatility, political instability, power-ARCH

From Riches to Rags, and Back? Explaining the Growth Trajectory of Argentina since the 1890s

Argentina is the only country in the world that was developed in 1900 and developing in 2000. Although various underlying reasons have been identified (chiefly political instability, financial development, inflation, trade openness, and international financial integration), no study has quantitatively assessed their relative importance. This paper tries to fill this gap. We use the power-ARCH framework and annual data since 1896 to study how important are these factors vis-à-vis both growth and growth volatility. Our results suggest that financial development, trade openness and political instability are the main factors, with important differences in terms of their short versus long-run behavior. --economic growth,financial development,volatility,political instability,trade openness,power-GARCH

History dependence of directly observed magnetocaloric effects in (Mn, Fe)As

We use a calorimetric technique operating in sweeping magnetic field to study the thermomagnetic history- dependence of the magnetocaloric effect (MCE) in Mn0.985Fe0.015As. We study the magnetization history for which a "colossal" MCE has been reported when inferred indirectly via a Maxwell relation. We observe no colossal effect in the direct calorimetric measurement. We further examine the impact of mixed-phase state on the MCE and show that the first order contribution scales linearly with the phase fraction. This validates various phase-fraction based methods developed to remove the colossal peak anomaly from Maxwell-based estimates.Comment: 4 pages, 2 figure

Phenomenology Tools on Cloud Infrastructures using OpenStack

We present a new environment for computations in particle physics phenomenology employing recent developments in cloud computing. On this environment users can create and manage "virtual" machines on which the phenomenology codes/tools can be deployed easily in an automated way. We analyze the performance of this environment based on "virtual" machines versus the utilization of "real" physical hardware. In this way we provide a qualitative result for the influence of the host operating system on the performance of a representative set of applications for phenomenology calculations.Comment: 25 pages, 12 figures; information on memory usage included, as well as minor modifications. Version to appear in EPJ