Gravitational Waves from the Collapse and Bounce of a Stellar Core in Tensor-Scalar Gravity
Gravitational Waves from the Collapse and Bounce of a Stellar Core in Tensor-Scalar Gravity
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张量标量引力下恒星核心塌缩和弹跳产生的引力波
DOI：
10.1086/308627
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
José M. Ibáñez
中科院分区：
文献类型：
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作者：
J. Novak;José M. Ibáñez
张量-标量引力理论允许从天体物理源产生引力波，例如超新星，甚至在球形情况下也是如此。这促使我们研究简并恒星核心在张量标量引力下的坍塌，导致中子星的形成，通过反弹和激波的形成。本文讨论了标量场对系统演化的影响，以及标量场强非微扰效应的出现(所谓的自发标度化)。作为主要结果，我们描述了由此产生的引力单极辐射(形式和幅度)，并讨论了目前正在建设的引力探测器探测它的可能性，同时考虑到对标量场的现有约束。从数值角度看，值得指出的是，我们开发了一种使用伪谱方法的组合程序，用于标量场和高分辨率激波捕获格式的演化，以及流体动力系统的演化。虽然这个程序已经被用来积分那个引力理论的场方程，但在球对称的情况下，本工作的一个副产品是为这种数值策略的数值相对论中的多维问题的进一步扩展获得经验。
Tensor-scalar theory of gravity allows the generation of gravitational waves from astrophysical sources, like supernovae, even in the spherical case. That motivated us to study the collapse of a degenerate stellar core, within tensor-scalar gravity, leading to the formation of a neutron star through a bounce and the formation of a shock. This paper discusses the effects of the scalar field on the evolution of the system, as well as the appearance of strong nonperturbative effects of this scalar field (the so-called spontaneous scalarization). As a main result, we describe the resulting gravitational monopolar radiation (form and amplitude) and discuss the possibility of its detection by the gravitational detectors currently under construction, taking into account the existing constraints on the scalar field. From the numerical point of view, it is worthy to point out that we have developed a combined code that uses pseudo-spectral methods for the evolution of the scalar field and High-Resolution Shock-Capturing schemes, as well as for the evolution of the hydrodynamical system. Although this code has been used to integrate the field equations of that theory of gravity, in the spherically symmetric case, a by-product of the present work is to gain experience for an ulterior extension to multidimensional problems in Numerical Relativity of such numerical strategy.