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Cosmic Evolution of Scalar Fields with Multiple Vacua: Generalized DBI and Quintessence

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Abstract

We find a method to rewrite the equations of motion of scalar fields, generalized DBI field and quintessence, in the autonomous form for arbitrary scalar potentials. With the aid of this method, we explore the cosmic evolution of generalized DBI field and quintessence with the potential of multiple vacua. Then we find that the scalars are always frozen in the false or true vacuum in the end. Compared to the evolution of quintessence, the generalized DBI field has more times of oscillations around the vacuum of the potential. The reason for this point is that, with the increasing of speed \(\dot {\phi }\), the friction term of generalized DBI field is greatly decreased. Thus the generalized DBI field acquires more times of oscillations.

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Acknowledgments

We thank one of the referees for pointing out some important typos. This work is supported by the Chinese MoST 863 program under grant 2012AA121701, the NSFC under grant 11373030, 10973014, 11373020 and 11465012.

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Authors and Affiliations

  1. Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China

    Changjun Gao

  2. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Changjun Gao

  3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China

    You-Gen Shen

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  1. Changjun Gao
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  2. You-Gen Shen
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Correspondence to Changjun Gao.

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Gao, C., Shen, YG. Cosmic Evolution of Scalar Fields with Multiple Vacua: Generalized DBI and Quintessence. Int J Theor Phys 55, 4532–4544 (2016). https://doi.org/10.1007/s10773-016-3076-x

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  • DOI: https://doi.org/10.1007/s10773-016-3076-x

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