Numerical simulations of extereme mass ratio inspirals, the mostimportant sources for LISA detector, face several computational challenges. We present a new approach to evolving partial differential equations occurring in black hole perturbation theory and calculations self-force acting on point particles orbiting supermassive holes. Such are distributionally sourced, standard numerical methods...

In this paper, we point out that the 4-vector force exerted on a particle by another particle is always in the direction orthogonal to the 4-vector velocity of the exerted particle in 4-dimensional space-time, rather than along the line joining the couple of the particles. This inference is obviously supported from the fact that the magnitude of the 4-vector velocity is always a constant. This ...

By carefully analyzing the geodesic motion of a test particle in the bulk of brane worlds, we identify an extra force which is recognized in spacetime of one lower dimensions as a non-gravitational force acting on the particle. Such extra force acts on the particle in such a way that the conventional particle mechanics in one lower dimensions is violated, thereby hinting at the higher-dimension...

We discuss an extension of the massively parallel cosmological simulation code gadget-2, which now enables investigation of multiple and distinct gravitational force laws, provided they are dominated by a constant scaling of the Newtonian force. In addition to simplifying investigations of a universally modified force law, the ngravs extension provides a foundation for state-of-the-art collisio...

The existence of gravitational radiation is a direct prediction of Einstein’s theory of general relativity, published in 1916. The observation of gravitational radiation will open a new astronomical window on the universe, allowing the study of dynamic strong-field gravity, as well as many other astrophysical objects and processes impossible to observe with electromagnetic radiation. The relati...

Centrifugal casting is one of the advanced casting branches widely used in the metallurgical industry in which the centrifugal force helps strengthen the workpiece material. The present work attempt to study the effect of the horizontal and vertical centrifugal casting parameters included the centrifugal mold rotation speeds and G-factors values on the quality of the product. The work has been ...