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Helena Pais博士学术报告预告

信息来源: 发布日期: 2017-06-20 浏览次数:

报告题目:The crust-core transition and the stellar matter equation of state

  人:Helena Pais 博士(University of Coimbra, Portugal)

     间:2017621 下午15:00

      点:物理楼313报告厅

     办:物理工程学院、激光研究所

 

报告摘要:

Neutron stars are one of the densest objects in the Universe. In this talk, I will start by giving a brief introduction to these compact objects. The goal is to describe the macroscopic properties of the star, that is, its mass and radius. For that, we will need first to construct the stellar matter equation of state (EoS), which should be in accordance with constrains coming  from both observations and experiments. I will use two different formalisms for the EoS: relativistic mean-field models and the SU(2) extended Nambu--Jona-Lasinio. Quantities like the crust-core transition density and pressure, will be introduced, and their effect on the mass-radius relation of the star and the star radius of the inclusion of a pasta calculation in the inner crust will be discussed. Finally, I will show the effect of strong external magnetic fields on the inner crust of the star. This is of the utmost importance for the study of magnetars, neutron stars with very strong magnetic fields, which have yet to be understood in more detail.

 

报告人简介:

Helena Pais got her PhD degree in Physics, with a concentration in Astrophysics, in 2013, at the University of Tennessee, Knoxville, USA, working under the supervision of Prof. Jirina Stone. Her thesis subject was focused on the equation of state for core-collapse supernova matter.

Since 2014, she is a post-doctoral researcher at the University of Coimbra, and she is very interested on the equation of state for nuclear and stellar matter. Exotic matter that may exist in the core of neutron stars, and the hadron-quark phase transition also play a part in her research interests, together with the density-dependence of the symmetry energy on the neutron star properties. She has published 17 papers so far in international peer-reviewed journals: 15 in Physical Review C, where 3 of them are Rapid Communications, 1 in Physical Review Letters , and 1 in Journal of Physics G.