Inverse-chirp signals and spontaneous scalarisation with self-interacting potentials in stellar collapse
Inverse-chirp signals and spontaneous scalarisation with self-interacting potentials in stellar collapse
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DOI：
10.1088/1361-6382/ab256f
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发表时间：
2019-03
影响因子：
3.5
通讯作者：
Roxana Rosca-Mead;C. Moore;M. Agathos;U. Sperhake
中科院分区：
文献类型：
--
作者：
Roxana Rosca-Mead;C. Moore;M. Agathos;U. Sperhake
研究了标量张量引力下恒星坍缩引力波信号在标量自相互作用影响下的变化规律。为此，我们从恒星坍缩的数值模拟中提取了一系列具有高阶项的引力辐射，除了二次质量项。我们的研究包括坍缩到中子星和黑洞，我们发现纯二次势得到的强逆啁啾信号在高阶势的变化下异常鲁棒；电位中的四次和六次项只有在它们的贡献被放大时才会导致波信号的明显差异，这意味着质量和自相互作用参数之间的相对微调在五个或更多数量级内。
We study how the gravitational wave signal from stellar collapse in scalar-tensor gravity varies under the influence of scalar self-interaction. To this end, we extract the gravitational radiation from numerical simulations of stellar collapse for a range of potentials with higher-order terms in addition to the quadratic mass term. Our study includes collapse to neutron stars and black holes and we find the strong inverse-chirp signals obtained for the purely quadratic potential to be exceptionally robust under changes in the potential at higher orders; quartic and sextic terms in the potential lead to noticeable differences in the wave signal only if their contribution is amplified, implying a relative fine-tuning to within five or more orders of magnitude between the mass and self-interaction parameters.