Dark energy modelsStructure formationWe investigate the clustering effect of dark energy (DE) in the formation of galaxy clusters using the spherical collapse model. Assuming a fully clustered DE component, the spherical overdense region is treated as an isolated system which conserves the energy ...
Abstract. We study the spherical collapse model for several dark-energy scenarios using the fully non-linear differential equation for the evolution of the
3 Equations of spherical top-hat collapse of viscous fluid The spherical collapse (SC) as a simple analytical model was first introduced by Gunn and Gutt [30] in order to calculate the evolution of the perturbations of in-falling material into a bound system, which provides a way to glimpse...
Singularities are commonly considered non-physical within the classical theoretical framework due to their infinite energy density, prompting researchers to seek resolution through the inclusion of quantum effects in matter or gravity. While singularity theorems rely on strict conditions like the null energy...
The smoothed particle hydrodynamics method was applied in a previous paper to a relativistic shock tube test problem. In this paper the method is further extended to relativistic, self-gravitating spherical collapse end compared directly with an equivalent finite element method code. The particle code...
Sign up with one click: Facebook Twitter Google Share on Facebook spherical coordinates (redirected fromSpherical polar coordinates) Encyclopedia pl n (Mathematics) three coordinates that define the location of a point in three-dimensional space in terms of the lengthrof its radius vector, the angl...
Extraordinary states of highly localised pressure and temperature can be generated upon the collapse of impulsively driven cavities. Direct observation of this phenomenon in solids has proved challenging, but recent advances in high-speed synchrotron rad
There were no cases of progression in the postoperative stages or re-collapse. Conclusion SVRO allows for the repositioning of the exterior and posterior intact areas, providing a broader intact region postoperatively. This technique is particularly beneficial for young patients with ONFH and extensive...
The smoothed particle hydrodynamics method was applied in a previous paper to a relativistic shock tube test problem. In this paper the method is further extended to relativistic, self-gravitating spherical collapse end compared directly with an equivalent finite element method code. The particle code...
gravity is also being considered to model stellar collapse [ 16 , 20 , 21 , 35 , 41 ]. since the exterior solution is pure radiation ( \(t^k{}_k=0\) ), the f ( r ) equation is still solved by the vaidya metric, where \(r=0\) . the junction conditions with the inner ...