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Effect of the Inverse Volume Modification in Loop Quantum Cosmology |
| XIONG Hua-Hui1**, ZHU Jian-Yang2***
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1Physics Teaching and Research Group, School of Biomedical Engineering, Capital Medical University, Beijing 100069
2Department of Physics, Beijing Normal University, Beijing 100875
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| Cite this article: |
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XIONG Hua-Hui, ZHU Jian-Yang 2011 Chin. Phys. Lett. 28 030401 |
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Abstract After incorporating the inverse volume modifications both in the gravitational and matter part in the improved framework of LQC, we find that the inverse volume modification can decrease the bouncing energy scale, and the presence of nonsingular bounce is generic. For the backward evolution in the expanding branch, in terms of different initial states, the evolution trajectories classify into two classes. One class with larger initial energy density leads to the occurrence of bounce in the region a>ach where ach marks the different inverse volume modification region. The other class with smaller initial energy density evolves back into the region ach. In this region, both the energy density for the scalar field and the bouncing energy scale decrease with the backward evolution. The bounce is present when the bouncing energy scale decreases to be equal to the energy density of the scalar field.
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| Keywords:
04.60.Pp
04.60.Kz
98.80.Qc
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Received: 22 June 2010
Published: 28 February 2011
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| PACS: |
04.60.Pp
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(Loop quantum gravity, quantum geometry, spin foams)
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04.60.Kz
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(Lower dimensional models; minisuperspace models)
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98.80.Qc
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(Quantum cosmology)
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[1] Bojowald M 2001 Phys. Rev. Lett. 86 5227
[2] Bojowald M 2008 Living Rev. Rel. 11 4
[3] Ashtekar A, Bojowald M and Lewandowski 2003 Adv. Theor. Math. Phys. 7 233
[4] Bojowald M 2002 Class. Quant. Grav. 19 5113
[5] Vandersloot K 2005 Phys. Rev. D 71 103506
[6] Ashtekar A, Pawlowski T and Singh P 2006 Phys. Rev. D 74 084003
[7] Willis J 2004 PhD Dissertation (Pennsylvania: Pennsylvania State University)
[8] Vandersloot K 2006 PhD Dissertation (Pennsylvania: Pennsylvania State University)
[9] Singh P, Vandersloot K and Vereshchagin G V 2006 Phys. Rev. D 74 043510
[10] Singh P 2006 Phys. Rev. D 73 063508
[11] Sami M, Singh P and Tsujikawa S 2006 Phys. Rev. D 74 043514
[12] Xiong H H and Zhu J Y 2007 Phys. Rev. D 75 084023
[13] Bojowald M 2006 Gen. Relativ. Gravit. 38 1771
[14] Bojowald M 2007 Phys. Rev. Lett. 98 031301
[15] Hossain G M 2005 Class. Quant. Grav. 22 2653
[16] Bojowald M 2002 Phys. Rev. Lett. 89 261301
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