The relativistic time evolution of multi-layer spherically symmetric shell systems—consisting
of infinitely thin shells separated by vacuum regions—is examined. Whenever two shells …

Interaction/collision of two concentric spherical thin-shells of linear fluid resulting in collapse
has been considered recently. We show that addition of finely tuned electric charges on the …

The crossing of three dust shells is considered as a simplified model for shell crossing
during the spherically symmetric collapse of dust which interacts only gravitationally. The …

We generalize the equations of motion of a shell for a sequence of thin shells and derive the
general form of the expansion law of the dust shell model which represents the FRW …

The new extension formalism, developed by Khakshournia and Mansouri, is used to analyze
the dynamics of a general shell of matter with an arbitrary finite thickness immersed in a …

Zkoumány jsou zejména cylindricky symetrické slupkové zdroje. Je nalezen obecný tvar
tenzoru energie a hybnosti odpovídající hmotě indukované na kolabující slupce. Průběh …