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A string-inspired quintom model of dark energy. (English) Zbl 1248.83155

Summary: We propose a quintom model of dark energy with a single scalar field \(\varphi \) given by the Lagrangian \(L= -V(\varphi)(1 - \alpha'\nabla\mu \varphi \nabla;\mu \varphi +\beta'\varphi \square \varphi)^{1/2}\). In the limit of \(\beta'\to 0\) our model reduces to the effective low energy Lagrangian of tachyon considered in the literature. We study the cosmological evolution of this model, and show explicitly the behaviors of the equation of state crossing the cosmological constant boundary.

MSC:

83F05 Relativistic cosmology
83E30 String and superstring theories in gravitational theory
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References:

[1] Riess, A. G., Astrophys. J., 116, 1009 (1998)
[2] Spergel, D. N., Astrophys. J. Suppl., 148, 175 (2003)
[3] Riess, A. G., Astrophys. J., 607, 665 (2004)
[4] Seljak, U., Phys. Rev. D, 71, 103515 (2005)
[5] Spergel, D. N.
[6] Riess, A. G.
[7] Li, H.; Su, M.; Fan, Z.; Dai, Z.; Zhang, X.
[8] Barger, V.; Marfatia, D.; Gao, Y.
[9] Feng, B.; Wang, X.; Zhang, X., Phys. Lett. B, 607, 35 (2005)
[10] Zhao, G.-B.; Xia, J.-Q.; Li, M.; Feng, B.; Zhang, X., Phys. Rev. D, 72, 123515 (2005)
[11] Hu, W., Phys. Rev. D, 71, 047301 (2005)
[12] Zhang, X.-F.; Qiu, T.-T., Phys. Lett. B, 642, 187 (2006)
[13] Wei, H.; Cai, R.-G., Phys. Rev. D, 73, 083002 (2006)
[14] Zhang, H.-S.; Zhu, Z.-H., Phys. Rev. D, 75, 023510 (2007)
[15] Zhang, X.; Wu, F.-Q., Phys. Rev. D, 72, 043524 (2005)
[16] Gerasimov, A. A.; Shatashvili, S. L., JHEP, 0010, 034 (2000)
[17] Kutasov, D.; Marino, M.; Moore, G. W., JHEP, 0010, 045 (2000)
[18] Kutasov, D.; Marino, M.; Moore, G. W.
[19] Barnaby, N.; Biswas, T.; Cline, J. M.
[20] Mukhopadhyay, P.; Sen, A., JHEP, 0211, 047 (2002)
[21] Sen, A., Int. J. Mod. Phys. A, 18, 4869 (2003)
[22] Zhang, K.-F.; Fang, W.; Lu, H.-Q., Int. J. Theor. Phys., 45, 1296 (2006)
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