A Modified Relativistic Model of Gravitational Propagation

a study on construction of iranian life tables: the case study of modified brass logit system

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Gravitational field of relativistic gyratons

The metric ansatz (1) is used to describe the gravitational field of a beam-pulse of spinning radiation (gyraton) in an arbitrary number of spacetime dimensions D. First we demonstrate that this metric belongs to the class of metrics for which all scalar invariants constructed from the curvature and its covariant derivatives vanish. Next, it is shown that the vacuum Einstein equations reduce to...

Gravitational Tunnelling of Relativistic Shells

Thin shells in general relativity have been used in the past as keystones to obtain realistic models of cosmological and astrophysical situations. A crucial role for these developments was played by the compact description of their dynamics in terms of Israel’s junction conditions. Starting from this geometrical formulation we present a problem related to the WKB regime of shell dynamics and su...

investigating the feasibility of a proposed model for geometric design of deployable arch structures

deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...

Gravitational radiation from relativistic sources