Abstract
We investigate the possibility of the enhancement of parity-violation signal in bouncing cosmology. Specifically, we are interested in deciding which phase should generate the most significant parity-violation signals. We find that the dominant contribution comes from the bouncing phase, while the contraction phase has a smaller contribution. Therefore, bouncing cosmology can enhance the parity-violation signals during the bouncing phase. Moreover, since the bouncing phase has the highest energy scale in bouncing cosmology, we can also probe new physics at this scale by studying the parity-violation effect.
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Acknowledgments
We thank Shingo Akama, Yi-Fu Cai, Chao Chen, Alexander Ganz, Chunshan Lin, Astuhisa Ota, Yun-Song Piao, Yi Wang and Yunlong Zheng for their helpful discussions and comments. M. Z. is supported by grant No. UMO 2018/30/Q/ST9/00795 from the National Science Centre, Poland. Y. C. is supported in part by the National Natural Science Foundation of China (Grant No. 11905224), the China Postdoctoral Science Foundation (Grant No. 2021M692942), and Zhengzhou University (Grant No. 32340282).
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Zhu, M., Cai, Y. Parity-violation in bouncing cosmology. J. High Energ. Phys. 2023, 95 (2023). https://doi.org/10.1007/JHEP04(2023)095
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DOI: https://doi.org/10.1007/JHEP04(2023)095