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引用次数: 0
摘要
摘要 我们在空间平坦的兰德尔-桑德鲁姆(RS)II(Randall-Sundrum (RS) II brane)上得到了一个振荡非星状宇宙学的新模型。在早期,宇宙是由一个标量场主导的,它具有一个膨胀的突发势 \(V(\phi )=A(e^{B\phi }-1)^2\) ,A 和 B 是常数。A和B是常数。有趣的是,我们发现这样一个标量场可以产生非奇异的反弹,从而取代 "星系大爆炸"。在由幽灵暗能量主导的[观测结果支持(Knop 等,发表于《天体物理学杂志》598:102, 2003. Spergel 等,发表于《天体物理学杂志》598:102, 2003.Spergel 等人在 Astrophys J Suppl 148:175, 2003.Tegmark等人在Phys Rev D 69:103501,2004)],从而避免了大裂解奇点,并通过收缩阶段导致了随后的非奇点反弹。在反弹和回转过程中,"鹤膜宇宙 "都会发生平滑的非奇异过渡,从而导致交替的膨胀和收缩阶段。这是第一个可以使一个具有正张力的单一支链世界循环的模型,详见结论部分的讨论。
A novel model of non-singular oscillating cosmology on flat Randall–Sundrum II braneworld
Abstract
We obtain a novel model of oscillating non-singular cosmology on the spatially flat Randall–Sundrum (RS) II brane. At early times, the universe is dominated by a scalar field with an inflationary emergent potential \(V(\phi )=A(e^{B\phi }-1)^2\), A and B being constants. Interestingly, we find that such a scalar field can source a non-singular bounce, replacing the big bang on the brane. The turnaround again happens naturally on the brane dominated by a phantom dark energy [favoured by observations (Knop et al. in Astrophys J 598:102, 2003. Spergel et al. in Astrophys J Suppl 148:175, 2003. Tegmark et al. in Phys Rev D 69:103501, 2004) at late times], thus avoiding the big rip singularity and leading upto the following non-singular bounce via a contraction phase. There is a smooth non-singular transition of the brane universe through both the bounce and turnaround, leading to alternate expanding and contracting phases. This is the first model where a single braneworld of positive tension can be made to recycle as discussed in details in the concluding section.
期刊介绍:
General Relativity and Gravitation is a journal devoted to all aspects of modern gravitational science, and published under the auspices of the International Society on General Relativity and Gravitation.
It welcomes in particular original articles on the following topics of current research:
Analytical general relativity, including its interface with geometrical analysis
Numerical relativity
Theoretical and observational cosmology
Relativistic astrophysics
Gravitational waves: data analysis, astrophysical sources and detector science
Extensions of general relativity
Supergravity
Gravitational aspects of string theory and its extensions
Quantum gravity: canonical approaches, in particular loop quantum gravity, and path integral approaches, in particular spin foams, Regge calculus and dynamical triangulations
Quantum field theory in curved spacetime
Non-commutative geometry and gravitation
Experimental gravity, in particular tests of general relativity
The journal publishes articles on all theoretical and experimental aspects of modern general relativity and gravitation, as well as book reviews and historical articles of special interest.