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arXiv 2201.03771astro-ph.HEgr-qc
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用二进制函数关闭自发标量化窗口

Closing a spontaneous-scalarization window with binary pulsars

Junjie Zhao, Paulo C. C. Freire, Michael Kramer, Lijing Shao, Norbert Wex

摘要:

得益于脉冲星计时技术的无与伦比的精度,双星是引力理论的重要试验平台,为引力理论的替代理论提供了一些最严格的界限。标量-张量引力理论是另一类有着良好动机的引力理论,它通过一种被称为自发标量化的非微扰现象预言了中子星与广义相对论的大偏差。这种效应无法在太阳系中测试,现在可以使用一组7个双星的最新结果来严格限制(PSR J0348+0432、J0737 $-$ 3039 A、J1012+5307、J1738+0333、J1909 $-$ 3744、J1913+1102和J2222 $-$ 0137),特别是PSR J 0737 $-$ 3039 A、J1913+1102和J2222 $-$ 0137的更新参数。使用新的定时结果,我们约束中子星的有效标量耦合,这说明如何强烈的中子星耦合到标量场,在贝叶斯分析的$\left|α_{\rm A}\right| \lesssim 6 \times 10^{-3}$的水平。我们的分析是彻底的,在这个意义上,我们的结果适用于所有的中子星质量和所有合理的状态方程的致密物质,在完整的相关参数空间。它排除了中子星自发标量化的可能性,至少在一类标量张量引力理论中是这样。

英文摘要:

Benefitting from the unequaled precision of the pulsar timing technique, binary pulsars are important testbeds of gravity theories, providing some of the tightest bounds on alternative theories of gravity. One class of well-motivated alternative gravity theories, the scalar-tensor gravity, predict large deviations from general relativity for neutron stars through a nonperturbative phenomenon known as spontaneous scalarization. This effect, which cannot be tested in the Solar System, can now be tightly constrained using the latest results from the timing of a set of 7 binary pulsars (PSRs J0348+0432, J0737$-$3039A, J1012+5307, J1738+0333, J1909$-$3744, J1913+1102, and J2222$-$0137), especially with the updated parameters of PSRs J0737$-$3039A, J1913+1102, and J2222$-$0137. Using new timing results, we constrain the neutron star's effective scalar coupling, which describes how strongly neutron stars couple to the scalar field, to a level of $\left|α_{\rm A}\right| \lesssim 6 \times 10^{-3}$ in a Bayesian analysis. Our analysis is thorough, in the sense that our results apply to all neutron star masses and all reasonable equations of state of dense matters, in the full relevant parameter space. It excludes the possibility of spontaneous scalarization of neutron stars, at least within a class of scalar-tensor gravity theories.

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