{"id":100422,"date":"2018-03-11T10:21:56","date_gmt":"2018-03-11T10:21:56","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/hydrodynamical-simulations-of-dns-systems-gravitational-emission-and-equation-of-state\/"},"modified":"2018-03-11T10:21:56","modified_gmt":"2018-03-11T10:21:56","slug":"hydrodynamical-simulations-of-dns-systems-gravitational-emission-and-equation-of-state","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/astronomia-y-astrofisica\/hydrodynamical-simulations-of-dns-systems-gravitational-emission-and-equation-of-state\/","title":{"rendered":"Hydrodynamical simulations of dns systems: gravitational emission and equation of state"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Rub\u00e9n Mart\u00edn Cabez\u00f3n G\u00f3mez <\/strong><\/h2>\n<p>Double neutron star systems (dns hereafter) are of major interest due to their extreme physical  characteristics. Because of neutron stars are extremely compact objects, with central densities ranging  from 1014  to 1015  g\/cm3 , very intense gravitational fields are governing the evolution of dns systems. This  evolution involves important general relativistic effects, being one of those the emission of gravitational  waves (gw). These are an oscillating warpage of the spacetime that carries away energy from the system.  in consequence the orbital distance of a dns gradually decreases, shrinking the orbit and leading to an  inevitable collision of the two neutron stars called  merger, while the whole process is named  coalescence. The most important observational evidence of this process is the orbital period decrease of  the hulse-taylor binary pulsar (psr1913+16), which has an excellent agreement with the theoretical  prediction due to gw emission.    gw have an important dependence on the equation of state (eos) of neutron stars, which nowadays is  still an important unknown. Therefore, gw have information regarding the actual eos that describes the  behavior of matter at nuclear densities. How to use gw to impose constraints in the  set of theoretical  nuclear eos is the topic addressed in this thesis. To that purpose we have developed a fully lagrangian  hydrocode based in the smoothed particle hydrodynamics (sph) technique. With this code we have  performed 29 numerical simulations of dns systems using eleven different eos that are commonly used  in literature. Eleven simulations have been done using a newtonian quadrupolar approximation, while the  remaining calculations have been done within the post-newtonian paradigm, including 1pn and 2.5pn  corrections, following the bds method.    from the results we could extract which are the magnitudes that can impose significant constraints in the  m-r diagram for neutron stars, and the precision up to which they should be obtained from future gw  detections in ground interferometers like advanced ligo, virgo or geo600. We also determined that the  inclusion of relativistic corrections in fact helps to distinguish among different eos and does not change  the general results obtained from newtonian simulations. This is a good prospect for future full  relativistic simulations which will probably be able to determine strong constraints that help to determine  which the actual eos of nuclear matter is.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Hydrodynamical simulations of dns systems: gravitational emission and equation of state<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Hydrodynamical simulations of dns systems: gravitational emission and equation of state <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Rub\u00e9n Mart\u00edn Cabez\u00f3n G\u00f3mez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/04\/2010<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Domingo Garc\u00eda Senz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: enrique Garc\u00eda-berro montilla <\/li>\n<li>eduardo Bravo guil (vocal)<\/li>\n<li>Jos\u00e9 Alberto Lobo gutierrez (vocal)<\/li>\n<li>Jos\u00e9 Mar\u00eda Ib\u00e1\u00f1ez cabanell (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Rub\u00e9n Mart\u00edn Cabez\u00f3n G\u00f3mez Double neutron star systems (dns hereafter) are of major interest due to their [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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