Yukawa vs. Newton: gravitational forces in a cubic cosmological simulation box

Cosmological Simulation of Gravitational Weak Lensing in Open Models

Cosmological simulation of gravitational weak lensing in open models with (Ω0, λ0) = (0.2, 0) and (0.4, 0) is treated using the direct integration method, which is independent of the multi-lens-plane method. Statistical averages of optical quantities (the convergence, shear, and amplification) are derived for ray bundles passing through the clumpy universe, in which the initial state has the CD...

Cosmological Constraints in SUSY with Yukawa Unification

The cosmological relic density of the lightest supersymmetric particle of the minimal supersymmetric standard model is calculated under the assumption of gauge and Yukawa coupling unification. We employ radiative electroweak breaking with universal boundary conditions from gravity-mediated supersymmetry breaking. Further constraints are imposed by the experimental bounds on the b–quark mass and...

Application of the proximity force approximation to gravitational and Yukawa-type forces

Simulation of a Box Annealing Unit

In this paper the heating process in a box annealing unit is simulated and the effect of various parameters involved in the process is examined. For this purpose, the full Naiver-Stokes equations along with the standard k- turbulence model are solved in the fluid region using the finite volume approach. In the solid area the conduction heat transfer equation is employed using approporate surfac...

Gravitational entropy in cosmological models

Penrose [1] has argued that the initial cosmological singularity must be one of low entropy in order to explain the high isotropy of the observed universe and to be consistent with the second law of thermodynamics. Since the matter was presumably in thermal equilibrium at the initial singularity, this implies low entropy in the gravitational field. Penrose has also conjectured that such a gravi...