39 citations · 413 across the 33 of their papers we have counts for
34 papers
Acoustic Hawking radiation as a tunnelling effect in Michel accretion
Nisha Jangid, Arnab K. Ray
Michel accretion becomes transonic at the saddle point of a dynamical system. An Eulerian perturbation on the steady inflow produces the metric of an acoustic black hole. As a high…
Logistic forecasting of GDP competitiveness
Arnab K. Ray
The GDP growth of national economies is modelled by the logistic function. Applying it on the GDP data of the World Bank till the year 2020, we forecast the outcome of the competit…
Global dynamics of GDP and trade
Abhin Kakkad, Arnab K. Ray
We use the logistic equation to model the dynamics of the GDP and the trade of the six countries with the highest GDP in the world, namely, USA, China, Japan, Germany, UK and India…
Surface tension and instability in the hydrodynamic white hole of a circular hydraulic jump
Jayanta K. Bhattacharjee, Arnab K. Ray
We impose a linearized Eulerian perturbation on a steady, shallow, radial outflow of a liquid (water), whose local pressure function includes both the hydrostatic and the Laplace p…
Regularities in stock markets
Abhin Kakkad, Harsh Vasoya, Arnab K. Ray
From the stock markets of six countries with high GDP, we study the stock indices, S&P 500 (NYSE, USA), SSE Composite (SSE, China), Nikkei (TSE, Japan), DAX (FSE, Germany), FTSE 10…
Dissipation and acoustic tunnelling about the sonic horizon of Bondi accretion
Arnab K. Ray
Viscous dissipation, as a small perturbative effect about the Bondi flow, shrinks its sonic sphere. An Eulerian perturbation on the steady flow gives a wave equation and the corres…