<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Vlahakis, Nektarios</style></author><author><style face="normal" font="default" size="100%">Königl, Arieh</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A model for GRB jets</style></title><short-title><style face="normal" font="default" size="100%">Astrophysics and Space Science</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2003</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2003/01/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2003Ap&amp;SS.287..249V</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">287</style></volume><pages><style face="normal" font="default" size="100%">249 - 252</style></pages><isbn><style face="normal" font="default" size="100%">0004-640X</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">By using relativistic, axisymmetric, ideal MHD, we examine the motion of the baryon/e&lt;SUP&gt;+/-&lt;/SUP&gt;/ photon fluid that emanates from a stellar-mass compact object/debris-disk system (a common outcome of many progenitor models). We prove that the motion can be described as a frozen pulse, which permits the study of each shell of the pancake-shaped outflow using steady-state equations. The ejected energy flux is dominated by the electromagnetic (Poynting) contribution, but it can also have a nonnegligible e&lt;SUP&gt;+/-&lt;/SUP&gt;/radiation (thermal fireball) component. We demonstrate, through exact self-similar solutions, that the flow is first thermally and subsequently magnetically accelerated up to equipartition between kinetic and Poynting fluxes, i.e., ~ 50% of the total energy is converted into baryonic kinetic energy. The electromagnetic forces also collimate the flow, reaching a cylindrical structure asymptotically.</style></abstract></record></records></xml>