COBE versus cosmic strings. An analytical model
COBE versus cosmic strings. An analytical model
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COBE 与宇宙弦。
DOI：
10.1016/0370-2693(93)91825-8
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
L. Perivolaropoulos
中科院分区：
文献类型：
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作者：
L. Perivolaropoulos
我们构造了一个简单的解析模型来研究宇宙弦对微波背景辐射的影响。我们的模型是基于计算从复合时间到今天由弦网络施加在光子轨迹上的随机多个脉冲。我们构造了温度自相关函数，并利用它得到了有效功率谱指数n、均方根四极归一化幅度QRMS-PS和均方根温度变化在小角度尺度上的平滑。对于Bennett和Bouchet[Phys.Rev.D 41(1990)2408]和Allen and Shellard[Phys.莱特牧师。得到n=1.14±0.5，QRMS-PS=(4.55±1.5)Gμ，(ΔT T)RMS=5.5Gμ。这些结果与COBE数据要求的一致性导致Gμ=(1.7±0.7)×10−6(其中μ是单位长度的弦质量)，与来自观测的μ的直接归一化很好地一致。
We construct a simple analytical model to study the effects of cosmic strings on the microwave background radiation. Our model is based on counting random multiple impulses inflicted on photon trajectories by the string network between the time of recombination and today. We construct the temperature auto-correlation function and use it to obtain the effective power spectrum index n, the RMS-quadrupole-normalized amplitude QRMS-PSand the RMS temperature variation smoothed on small angular scales. For the values of the scaling solution parameters obtained by Bennett and Bouchet [Phys. Rev. D 41 (1990) 2408] and Allen and Shellard [Phys. Rev. Lett. 64 (1990) 119] we obtain n=1.14±0.5, QRMS-PS=(4.55±1.5)Gμ and ( ΔT T )RMS=5.5Gμ . Demanding consistency of these results with the COBE data leads to Gμ = (1.7 ± 0.7) × 10−6(where μ is the string mass per unit length), in good agreement with direct normalizations of μ from observations.