Khatri Rishi, Wandelt Benjamin D
Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USA.
Phys Rev Lett. 2008 Mar 7;100(9):091302. doi: 10.1103/PhysRevLett.100.091302. Epub 2008 Mar 4.
We calculate the contribution of cosmic strings arising from a phase transition in the early Universe, or cosmic superstrings arising from brane inflation, to the cosmic 21 cm power spectrum at redshifts z > or =30. Future experiments can exploit this effect to constrain the cosmic string tension G mu and probe virtually the entire brane inflation model space allowed by current observations. Although current experiments with a collecting area of approximately 1 km2 will not provide any useful constraints, future experiments with a collecting area of 10(4)-10(6) km2 covering the cleanest 10% of the sky can, in principle, constrain cosmic strings with tension G mu > or = 10(-10)-10(-12) (superstring/phase transition mass scale >10(13) GeV).
我们计算了早期宇宙相变产生的宇宙弦或膜暴胀产生的宇宙超弦对红移(z\geq30)时宇宙21厘米功率谱的贡献。未来的实验可以利用这种效应来限制宇宙弦张力(G\mu)，并几乎探测当前观测允许的整个膜暴胀模型空间。尽管目前收集面积约为1平方千米的实验不会提供任何有用的限制，但原则上，未来收集面积为(10^4 - 10^6)平方千米、覆盖天空最干净10%区域的实验可以限制张力(G\mu\geq10^{-10} - 10^{-12})（超弦/相变质量尺度(>10^{13}) GeV）的宇宙弦。
