Gravitational waves from asymmetric oscillon dynamics?
Gravitational waves from asymmetric oscillon dynamics?
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DOI：
10.1103/physrevd.98.024040
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发表时间：
2018-03
影响因子：
5
通讯作者：
M. Amin;Jonathan Braden;E. Copeland;J. Giblin;C. Solorio;Zachary J. Weiner;Shuang-Yong Zhou
中科院分区：
文献类型：
--
作者：
M. Amin;Jonathan Braden;E. Copeland;J. Giblin;C. Solorio;Zachary J. Weiner;Shuang-Yong Zhou
最近有人提出，在早期宇宙中由某些非对称势产生的光子在形成后继续发射引力波，膨胀了$e$-倍，导致可能可探测到的引力波信号。我们通过使用GPU加速的晶格模拟进行收敛研究来重新审视这一主张，并表明随着时间的推移累积的数值误差在低分辨率场景中是显著的，或者在运行时导致分辨率下降到低于问题中的相关尺度的场景中。我们的研究表明，在基准“山顶模型”[arXiv：1607.01314]中，引力波信号的主要的、不断增长的高频峰值是一个数值伪影。
It has been recently suggested that oscillons produced in the early universe from certain asymmetric potentials continue to emit gravitational waves for a number of $e$-folds of expansion after their formation, leading to potentially detectable gravitational wave signals. We revisit this claim by conducting a convergence study using GPU-accelerated lattice simulations and show that numerical errors accumulated with time are significant in low-resolution scenarios, or in scenarios where the run-time causes the resolution to drop below the relevant scales in the problem. Our study suggests that the dominant, growing high frequency peak of the gravitational wave signals in the fiducial "hill-top model" [arXiv:1607.01314] is a numerical artifact.