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arXiv 1802.04813astro-ph.HEhep-phnucl-th
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中子星合并啁啾关于真空能量

Neutron Star Mergers Chirp About Vacuum Energy

Csaba Csáki, Cem Eröncel, Jay Hubisz, Gabriele Rigo, John Terning

摘要:

对来自中子星合并的引力波的观测为探索基础物理开辟了新的方向:它们首次提供了对物体结构的访问,真空能量对其总质量的贡献不可忽略。在中子星的内核中存在这样的真空能量,这发生在大密度的新QCD相中,真空能量出现在新相的状态方程中。这反过来又导致了中子星内部结构的变化,并影响了它们的潮汐形变率,而潮汐形变率可以在合并中子星的啁啾信号中测量到。通过考虑三种常用的中子星模型,我们表明,对于大啁啾质量的真空能量的潮汐形变的影响是相当大的。这类测量有可能提供独立于宇宙加速度的真空能量的引力性质的第一个测试,并确定QCD对真空能量的贡献大小。

英文摘要:

Observations of gravitational waves from neutron star mergers open up novel directions for exploring fundamental physics: they offer the first access to the structure of objects with a non-negligible contribution from vacuum energy to their total mass. The presence of such vacuum energy in the inner cores of neutron stars occurs in new QCD phases at large densities, with the vacuum energy appearing in the equation of state for a new phase. This in turn leads to a change in the internal structure of neutron stars and influences their tidal deformabilities which are measurable in the chirp signals of merging neutron stars. By considering three commonly used neutron star models we show that for large chirp masses the effect of vacuum energy on the tidal deformabilities can be sizable. Measurements of this sort have the potential to provide a first test of the gravitational properties of vacuum energy independent from the acceleration of the Universe, and to determine the size of QCD contributions to the vacuum energy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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