Gravitational wave bursts from cosmic string cusps and pseudocusps
Gravitational wave bursts from cosmic string cusps and pseudocusps
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DOI：
10.1103/physrevd.96.023533
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发表时间：
2016-12
影响因子：
5
通讯作者：
M. J. Stott;Thomas Elghozi;M. Sakellariadou
中科院分区：
文献类型：
--
作者：
M. J. Stott;Thomas Elghozi;M. Sakellariadou
我们研究了尖点和伪尖点对宇宙（超弦）引力波爆发的相对贡献。在弦上相对论性强的点附近，引力波的发射频率在足够高的情况下，遵循对数衰减规律。对于在极限c=1时恰好达到光速的点，通过分析发现斜率为$^{-4}/3 $。我们调查的变化，这种高频率的行为相对于速度的点考虑，通过数值模拟形成的字符串，然后，我们数值计算发出的引力波。我们发现，当弦点的运动速度从理论（相对论）极限c=1$到10 ^{-3}$时，引力波的发射遵循与尖点一致的行为，有效地增加了弦上尖点的数量。事实上，根据为这种行为选择的速度阈值，我们表明弦世界面的发射部分仅相对于尖点的发射被增强了一个因子。
We study the relative contribution of cusps and pseudocusps, on cosmic (super)strings, to the emitted bursts of gravitational waves. The gravitational wave emission in the vicinity of highly relativistic points on the string follows, for a high enough frequency, a logarithmic decrease. The slope has been analytically found to be $^{-4}/_3$ for points reaching exactly the speed of light in the limit $c=1$. We investigate the variations of this high frequency behaviour with respect to the velocity of the points considered, for strings formed through a numerical simulation, and we then compute numerically the gravitational waves emitted. We find that for string points moving with velocities as far as $10^{-3}$ from the theoretical (relativistic) limit $c=1$, gravitational wave emission follows a behaviour consistent with that of cusps, effectively increasing the number of cusps on a string. Indeed, depending on the velocity threshold chosen for such behaviour, we show the emitting part of the string worldsheet is enhanced by a factor ${\cal O}(10^3)$ with respect to the emission of cusps only.