Towards the higher point holographic momentum space amplitudes

In this paper, we calculate higher point tree level vector amplitudes propagating in AdS$_4$. We use bulk perturbation theory to compute tree level Witten diagrams. We show that when these amplitudes are written in momentum space, they reduce to relatively simple expressions. We explicitly compute four and five point correlators and also sketch a general strategy to compute the full six-point correlators.Comment: 20 pages, 6 figures, minor typos corrected, journal versio

Shear-induced diffusion in non-local granular flows

We investigate the properties of self-diffusion in heterogeneous dense granular flows involving a gradient of stress and inertial number. The study is based on simulated plane shear with gravity and Poiseuille flows, in which non-local effects induce some creep flow in zones where stresses are below the yield. Results show that shear-induced diffusion is qualitatively different in zones above and below the yield. Below the yield, diffusivity is no longer governed by velocity fluctuations, and we evidenced a direct scaling between diffusivity and local shear rate. This is interpreted by analysing the grain trajectories, which exhibit a caging dynamics developing in zones below the yield. We finally introduce an explicit scaling for the profile of local inertial number in these zones, which leads to a straightforward expression of the diffusivity as a function of the stress and position in non-local flows.Comment: 7 pages, 5 figure

Competitiveness of Nepalese ready-made garments after expiry of the Agreements on Textiles and Clothing

The study examines what has been the export performance of the RMG industry in Nepal in the post-ATC period with a focus on the United States market? and how has the expiry of the ATC impacted Nepal's competitiveness in RMG exports in the United States market?Competitivenss, Reagy-made garments, Agreements on Textiles and Clothing, Nepal

Chaos-based communication scheme using proportional and proportional-integral observers

In this paper, we propose a new chaos-based communication scheme using the observers. The novelty lies in the masking procedure that is employed to hide the confidential information using the chaotic oscillator. We use a combination of the addition and inclusion methods to mask the information. The performance of two observers, the proportional observer (P-observer) and the proportional integral observer (PI-observer) is compared that are employed as receivers for the proposed communication scheme. We show that the P-observer is not suitable scheme since it imposes unpractical constraints on the messages to be transmitted. On the other hand, we show that the PI-observer is the better solution because it allows greater flexibility in choosing the gains of the observer and does not impose any unpractical restrictions on the message

The Complex Reaction of Monetary Policy to the Exchange Rate

We estimate a flexible non-linear monetary policy rule for the UK to examine the response of policymakers to the real exchange rate. We have three main findings. First, policymakers respond to real exchange rate misalignment rather than to the real exchange rate itself. Second, policymakers ignore small deviations of the exchange rate; they only respond to real exchange under-valuations of more than 4% and over-valuations of more than 5%. Third, the response of policymakers to inflation is smaller when the exchange rate is over-valued and larger when it is under-valued. None of these responses is allowed for in the widely-used Taylor rule, suggesting that monetary policy is better analysed using a more sophisticated model, such as the one suggested in this paper

The complex response of monetary policy to the exchange rate

We estimate a flexible non-linear monetary policy rule for the UK to examine the response of policymakers to the real exchange rate. We have three main findings. First, policymakers respond to real exchange rate misalignment rather than to the real exchange rate itself. Second, policymakers ignore small deviations of the exchange rate; they only respond to real exchange under-valuations of more than 4% and over-valuations of more than 5%. Third, the response of policymakers to inflation is smaller when the exchange rate is over-valued and larger when it is under-valued. None of these responses is allowed for in the widely-used Taylor rule, suggesting that monetary policy is better analysed using a more sophisticated model, such as the one suggested in this paper