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The CST bounce universe model — A parametric study

Cheung, Yeuk-Kwan Edna and Song, Xue and Li, ShuYi and Li, YunXuan and Zhu, YiQing (2019) The CST bounce universe model — A parametric study. Science China Physics, Mechanics & Astronomy, 62 (1). Art. No. 010011. ISSN 1674-7348. doi:10.1007/s11433-018-9251-0.

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A bounce universe model with a scale-invariant and stable spectrum of primordial density perturbations was constructed using a consistent truncation of the D-brane dynamics from Type IIB string theory. A coupling was introduced between the tachyon field and the adjoint Higgs field on the D3-branes to lock the tachyon at the top of its potential hill and to model the bounce process, which is known as the Coupled Scalar and Tachyon Bounce (CSTB) Universe. The CSTB model has been shown to be ghost free, and it fulfils the null energy condition; in addition, it can also solve the Big Bang cosmic singularity problem. In this paper we conduct an extensive follow-up study of the parameter space of the CSTB model. In particular we are interested in the parameter values that can produce a single bounce to arrive at a radiation-dominated universe. We further establish that the CSTB universe is a viable alternative to inflation, as it can naturally produce a sufficient number of e-foldings in the locked inflation epoch and in the post-bounce expansion to overcome the four fundamental limitations of the Big Bang cosmology, which are flatness, horizon, homogeneity and singularity, resulting in a universe of the current size.

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Additional Information:© Science China Press and Springer-Verlag GmbH Germany 2018. Received April 6, 2018; accepted May 22, 2018; published online August 9, 2018. We would like to thank Jin U Kang, ChangHong Li and Yuan Xin for useful discussions. This work was supported by the National Natural Science Foundation of China (Grant Nos. 11775110, and 11690034), the European Union’s Horizon 2020 Research and Innovation (RISE) Programme (Grant No. 644121), and the Priority Academic Program Development for Jiangsu Higher Education Institutions (PAPD).
Funding AgencyGrant Number
National Natural Science Foundation of China11775110
National Natural Science Foundation of China11690034
European Research Council (ERC)644121
Priority Academic Program Development for Jiangsu Higher Education InstitutionsUNSPECIFIED
Subject Keywords:bounce universe, Big Bang singularity, tachyon inflation, flatness and horizon problems
Issue or Number:1
Classification Code:PACS number(s): 11.25.Uv, 11.25.Mj, 11.25.Wx, 98.80.k, 98.80.Cq
Record Number:CaltechAUTHORS:20180813-091038017
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Official Citation:Cheung, YK.E., Song, X., Li, S. et al. Sci. China Phys. Mech. Astron. (2019) 62: 10011.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88787
Deposited By: George Porter
Deposited On:13 Aug 2018 16:22
Last Modified:16 Nov 2021 00:29

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