Constraints of gravitational baryo/leptogenesis on Cardassian expansion

ZHANG Xu-Ning

doi:10.1088/1674-1137/35/10/006

Chinese Physics C> 2011, Vol. 35> Issue(10) : 920-924 DOI: 10.1088/1674-1137/35/10/006

Constraints of gravitational baryo/leptogenesis on Cardassian expansion

ZHANG Xu-Ning

Hezhou University, Hezhou 542800, China

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In this paper, proceeding from the relation between the Cardassian model and the accelerated expansion of the universe, adopting a parametric method which does not depend on a precise mechanism for gravitational baryo/leptogenesis and using the model parameter of CPT-violating interaction, we study the role of the modified Friedmann equation which plays a role in the matter asymmetry of the early epoch and the accelerated expansion of the present universe. Thus the appropriate Cardassian component in the radiation-dominated era or in the matter-dominated universe can be obtained. The results indicate that early CPT-violation is included in the Cardassian term. In the same way, the present Cardassian term that belongs to a quintessence-like model can drive the universe towards a flat, matter-dominated and accelerating expansion.

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ZHANG Xu-Ning. Constraints of gravitational baryo/leptogenesis on Cardassian expansion[J]. Chinese Physics C, 2011, 35(10): 920-924. doi: 10.1088/1674-1137/35/10/006

ZHANG Xu-Ning. Constraints of gravitational baryo/leptogenesis on Cardassian expansion[J]. Chinese Physics C, 2011, 35(10): 920-924. doi: 10.1088/1674-1137/35/10/006 shu

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Received: 2010-12-20
Revised: 2011-02-15

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Constraints of gravitational baryo/leptogenesis on Cardassian expansion

Hezhou University, Hezhou 542800, China

Received Date: 2010-12-20

Accepted Date: 2011-02-15

Available Online: 2011-10-05

Abstract: In this paper, proceeding from the relation between the Cardassian model and the accelerated expansion of the universe, adopting a parametric method which does not depend on a precise mechanism for gravitational baryo/leptogenesis and using the model parameter of CPT-violating interaction, we study the role of the modified Friedmann equation which plays a role in the matter asymmetry of the early epoch and the accelerated expansion of the present universe. Thus the appropriate Cardassian component in the radiation-dominated era or in the matter-dominated universe can be obtained. The results indicate that early CPT-violation is included in the Cardassian term. In the same way, the present Cardassian term that belongs to a quintessence-like model can drive the universe towards a flat, matter-dominated and accelerating expansion.

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