To understand the properties of a possible cosmic string network requires knowledge of the structures on long strings, which control the breaking off of smaller loops. These structures are influenced by backreaction due to gravitational wave emission. To gain an understanding of this process, we calculate the effect of gravitational backreaction on the "helical breather": an infinite cosmic string with a helical standing wave. We do the calculation analytically to first order in the amplitude of the oscillation. Our results for the rate of loss of length agree with the total power emitted from this system as calculated by Sakellariadou. We also find a rotation of the generators of the string that leads to an advancement of the phase of the oscillation in addition to that produced by the loss of length.
Numerical gravitational backreaction on cosmic string loops from simulation
Wentworth Institute of Technology（温特沃斯理工学院）；Tufts University（塔夫茨大学）；University of the Basque Country UPV/EHU（巴斯克地区大学）；Peddie School（佩迪学校）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；Acton-Boxborough Regional High School（阿克顿-博克斯波罗区域高中）
More accurate gravitational wave backgrounds from cosmic strings
Wentworth Institute of Technology（温特沃斯理工学院）；Tufts University（塔夫茨大学）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯科，巴斯克科学基金会）；University of the Basque Country UPV/EHU（巴斯克地区大学）
High-frequency gravitational waves from axion inflation in the weak-backreaction regime
Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）
The Abdus Salam ICTP（阿卜杜斯·萨拉姆国际理论物理中心）；Institute for Fundamental Physics of the Universe（基础物理宇宙研究所）；Department of Applied Mathematics and Theoretical Physics, University of Cambridge（剑桥大学应用数学与理论物理系）；Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS)（韩国基础科学研究所宇宙理论物理中心）；CAPA & Departamento de Física Teórica, Universidad de Zaragoza（萨拉戈萨大学理论物理部及CAPA）
Stochastic gravitational waves from cosmic string loops in scaling
如果宇宙弦是在早期宇宙中形成的，它们的相关环在整个宇宙历史中发射引力波，并在所有频率上贡献于随机的引力波背景。我们提供了一个新的估计的随机引力波频谱考虑一个现实的宇宙循环分布，在缩放，因为它可以推断从南部-后藤数值模拟。我们的结果考虑了迄今为止忽略的各种影响。我们包括两个引力波发射和回反应的影响上的环分布，并表明，他们产生两个不同的功能的频谱。关于弦的微观结构，除了尖点和扭结的存在下，我们表明，由扭结碰撞产生的引力波爆发可能占主导地位的摆动弦的信号，这种情况可能是有利的，在最近的数值模拟。鉴于这些新的结果，我们提出了四个原型方案，剩余的理论不确定性的范围内，我们推导出相应的信号，并估计由LIGO和欧洲脉冲星定时阵列（EPTA）观测的弦张力的约束。在95%的置信度下，这些方案中约束较少的方案显示出弦线张力GU < 7.2 x 10^{-11}。每次振荡携带两个尖点的平滑回路验证了两西格玛界限GU < 1.0 x 10^{-11}，而所有场景中最受约束的描述了非常弯曲的回路，并在95%的置信度下满足GU < 6.7 x 10^{-14}。
