Has India emerged? Business cycle facts from a transitioning economy.

This paper presents a comprehensive set of stylised facts for business cycles in India from 1950 - 2009. We find that the nature of the business cycle has changed dramatically after India's liberalisation reforms in 1991. In particular, after the the mid 1990s, the properties of India's business cycle has moved closer in key respects to select advanced countries. This is consistent with India's structural transformation from a pre-dominantly agricultural and planned developing economy to a more mar- ket based industrial-income economy. We also identify in what respects the behaviour of the Indian business cycle is different from that of other advanced economies, and closer to that of other less developed economies. This is the first exercise of this kind to generate an exhaustive set of stylised facts for India using both annual and quarterly data.Macroeconomics ; Real business cycles ; Emerging market DSGE models ; Volatility and growth

Soft factors and interaction vertices from light-cone actions

Universal factors associated with the emission of a soft boson in gauge theories and gravity, formulated in the light-cone gauge, are presented. The inverse-soft method, for constructing higher-point amplitudes from lower-point ones, using these factors is reviewed. These ideas are then examined in (light-cone) superspace and applied to both the N=4 super Yang-Mills and N=8 supergravity theories. One highlight is a compact result for the quartic interaction vertex in N=8 supergravity, a crucial ingredient for finiteness analyses.Comment: 18 pages, 2 figure

Performance Improvement of Solar PV Cells using Various Cooling Methods: A Review

the operating surface is a key operational factor to take into consideration to achieve higher efficiency when operating solar photovoltaic system. Proper cooling can improve the electric efficiency and decrease the rate of cell degradation with time, resulting in maximization of the life span of photovoltaic modules. The excessive heat removed by the cooling system used in domestic, commercial or industrial applications. Various cooling methods available for PV cells Such as Active and Passive cooling system. In this paper use various cooling methods for PV panel. Just like it heat pipe, floating, PCM used in back side of PV panel, evaporative cooling for PV panel

Deriving interaction vertices in higher derivative theories

We derive cubic interaction vertices for a class of higher-derivative theories involving three arbitrary integer spin fields. This derivation uses the requirement of closure of the Poincar\`e algebra in four-dimensional flat spacetime. We find two varieties of permitted structures at the cubic level and eliminate one variety, which is proportional to the equations of motion, using suitable field redefinitions. We then consider soft theorems for field theories with higher-derivative interactions and construct amplitudes in these theories using the inverse-soft approach.Comment: 18 page

Homodyne detection of a two-photon resonance assisted by cooperative emission

Using a transient regime approach, we explore atomic two-photon spectroscopy with self-aligned homodyne interferometry in the $\Lambda$-system. The two light sources at the origin of the interference, are the single-photon transient transmission of the probe, and the slow light of the electromagnetically induced transparency, whereas the atomic medium is characterized by a large optical depth. After an abrupt switch off of the probe laser (flash effect), the transmission signal is reinforced by cooperativity, showing enhanced sensitivity to the two-photon frequency detuning. If the probe laser is periodically switched on and off, the amplitude of the transmission signal varies and remains large even at high modulation frequency. This technique has potential applications in sensing, such as magnetometry and velocimetry, and in coherent population trapping clock.Comment: 4 figures and 8 pages including an appendix and reference

Perturbative linearization of supersymmetric Yang-Mills theory

Supersymmetric gauge theories are characterized by the existence of a transformation of the bosonic fields (Nicolai map) such that the Jacobi determinant of the transformation equals the product of the Matthews-Salam-Seiler and Faddeev-Popov determinants. This transformation had been worked out to second order in the coupling constant. In this paper, we extend this result (and the framework itself) to third order in the coupling constant. A diagrammatic approach in terms of tree diagrams, aiming to extend this map to arbitrary orders, is outlined. This formalism bypasses entirely the use of anti-commuting variables, as well as issues concerning the (non-)existence of off-shell formulations for these theories. It thus offers a fresh perspective on supersymmetric gauge theories and, in particular, the ubiquitous N = 4 theory. © 2020, The Author(s)