Mass-Gap Neutron Stars from Vector f(R) Gravity Inflationary Deformations

IF 2.8 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
V. K. Oikonomou
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Abstract

The latest observations from the LIGO-Virgo indicated the existence of mass-gap region astrophysical objects. This is a rather sensational observation and there are two possibilities for the nature of these mass-gap region astrophysical objects, these are either small black holes that result from the mergers of ordinary mass neutron stars, or these are heavy neutron stars. In the line of research implied by the former possibility, in this work we shall examine the implied neutron star phenomenology from vector f(R) gravity inflationary models. These theories are basically scalar-tensor deformations of the Starobinsky inflationary model. We shall present the essential features of cosmologically viable and non-viable deformations of the Starobinsky model, originating from vector f(R) gravity inflationary theories, and we indicate which models and for which equations of state provide a viable neutron star phenomenology. We solve the Tolman-Oppenheimer-Volkov equations using a robust double shooting LSODA python based code, for the following piecewise polytropic equations of state: the WFF1, the SLy, the APR, the MS1, the AP3, the AP4, the ENG, the MPA1 and the MS1b. We confront the resulting phenomenology with several well-known neutron star constraints, and we indicate which equation of state and model fits the phenomenological constraints. A remarkable feature, also known from other inflationary attractor models, is that the MPA1 is the equation of state which is most nicely fitted to the constraints, for all the theoretical models used, and actually the maximum mass for this equation of state is well inside the mass-gap region. Another mentionable feature that stroked us with surprise is the fact that even cosmologically non-viable inflationary models produced a viable neutron star phenomenology, which most likely has to be a model-dependent feature.

从矢量f(R)重力暴胀变形看质量间隙中子星
来自LIGO-Virgo的最新观测表明,质量间隙区天体物理对象的存在。这是一个相当轰动的观察结果对于这些质量间隙区域天体物理对象的性质有两种可能性,这些要么是普通质量中子星合并产生的小黑洞,要么是重中子星。在前一种可能性所暗示的研究路线中,在这项工作中,我们将从矢量f(R)重力暴胀模型中研究隐含的中子星现象学。这些理论基本上是斯塔宾斯基暴胀模型的标量张量变形。我们将提出起源于向量f(R)重力暴胀理论的Starobinsky模型的宇宙学上可行和不可可行的变形的基本特征,并指出哪些模型和哪些状态方程提供了可行的中子星现象学。我们使用基于python的鲁棒双射击LSODA代码求解Tolman-Oppenheimer-Volkov方程,用于以下分段多向状态方程:WFF1, SLy, APR, MS1, AP3, AP4, ENG, MPA1和MS1b。我们将得到的现象学与几个众所周知的中子星约束进行了比较,并指出了哪个状态方程和模型符合现象学约束。一个显著的特征,也从其他暴胀吸引子模型中知道,是MPA1是最适合所有使用的理论模型的状态方程,实际上,这个状态方程的最大质量在质量间隙区域内。另一个让我们惊讶的特征是,即使在宇宙学上不可行的暴胀模型也能产生可行的中子星现象学,这很可能是一个依赖于模型的特征。
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来源期刊
General Relativity and Gravitation
General Relativity and Gravitation 物理-天文与天体物理
CiteScore
4.60
自引率
3.60%
发文量
136
审稿时长
3 months
期刊介绍: General Relativity and Gravitation is a journal devoted to all aspects of modern gravitational science, and published under the auspices of the International Society on General Relativity and Gravitation. It welcomes in particular original articles on the following topics of current research: Analytical general relativity, including its interface with geometrical analysis Numerical relativity Theoretical and observational cosmology Relativistic astrophysics Gravitational waves: data analysis, astrophysical sources and detector science Extensions of general relativity Supergravity Gravitational aspects of string theory and its extensions Quantum gravity: canonical approaches, in particular loop quantum gravity, and path integral approaches, in particular spin foams, Regge calculus and dynamical triangulations Quantum field theory in curved spacetime Non-commutative geometry and gravitation Experimental gravity, in particular tests of general relativity The journal publishes articles on all theoretical and experimental aspects of modern general relativity and gravitation, as well as book reviews and historical articles of special interest.
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