Quantizing strings in de Sitter space

Miao Li University of Science and Technology of China, Hefei Wei Song Institute of Theoretical Physics,Academia Sinica Yushu Song Institute of Theoretical Physics,Academia Sinica, Beijing

Mathematical Physics mathscidoc:1702.22040

Journal of High Energy Physics, 4, 2007.4
We quantize a string in the de Sitter background, and we find that the mass spectrum is modified by a term which is quadratic in oscillating numbers, and also proportional to the square of the Hubble constant.
String theory and cosmic strings , Bosonic Strings .
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@inproceedings{miao2007quantizing,
  title={Quantizing strings in de Sitter space },
  author={Miao Li, Wei Song, and Yushu Song},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170228155823841651572},
  booktitle={Journal of High Energy Physics},
  volume={4},
  year={2007},
}
Miao Li, Wei Song, and Yushu Song. Quantizing strings in de Sitter space . 2007. Vol. 4. In Journal of High Energy Physics. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170228155823841651572.
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