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arXiv 0812.1732gr-qc
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厚DGP膜世界

Thick DGP braneworlds

Israel Quiros, Tonatiuh Matos

摘要:

我们研究了有限厚度的Dvali-Gabadadze-Porrati膜世界。相对于标准的(薄的)DGP弗里德曼方程,膜的有限厚度导致宇宙学方程的微妙修改,这可能导致重大的物理后果。由此产生的宇宙学是由两个长度尺度分别与膜厚度和交叉长度。在这种设置中,膨胀的早期膨胀和后期加速都是5D几何形状的结果。在早期,以及在后期,5D效应成为主导(重力泄漏到额外的维度),而在中期,由于标准(薄)DGP场景中发生的非平凡物理学,重力实际上是4D的。

英文摘要:

We study Dvali-Gabadadze-Porrati braneworlds with finite thickness. In respect to standard (thin) DGP Friedmann equation, finite thickness of the brane causes a subtle modification of the cosmological equations that can lead to significant physical consequences. The resulting cosmology is governed by two length scales which are associated with the brane thickness and with the crossover length respectively. In this setup both early inflation and late-time acceleration of the expansion are a consequence of the 5D geometry. At early times, as well as at late times, 5D effects become dominant (gravity leaks into the extra dimension), while, at intermediate times, gravity is effectively 4D due to non-trivial physics occuring in standard (thin) DGP scenarios.

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