Diluting the cosmological constant in infinite volume extra dimensions
Diluting the cosmological constant in infinite volume extra dimensions
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DOI：
10.1103/physrevd.67.044020
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发表时间：
2003-02-15
影响因子：
5
通讯作者：
Shifman, M
中科院分区：
文献类型：
--
作者：
Dvali, G;Gabadadze, G;Shifman, M
我们认为宇宙学常数问题可以在无限体积额外维度的薄膜世界模型中解决，从而避免了适用于红外四维理论的不可行的争论。在超哈勃距离下，薄膜上的重力变得更高维，这意味着加速率与真空能量密度的关系比传统的关系颠倒了。加速速率随能量密度的增加而减小。当能量密度大于(1TeV)(4)时，获得了实验上可接受的速率。结果在量子修正下是稳定的，因为超对称性只在膜上被破坏，并在无限体积的额外空间中保持精确。4D引力和宇宙学在薄膜上的一致性要求量子重力标度在10(-3)eV左右。在这种方法中出现的可检验的预测是：(I)亚毫米重力和哈勃尺度的同时修正，以及(Ii)由于间隔等于10(-3)eV的Regge谱，TeV能量碰撞中的Hagedorn类型的饱和。
We argue that the cosmological constant problem can be solved in a braneworld model with infinite-volume extra dimensions, avoiding no-go arguments applicable to theories that are four dimensional in the infrared. Gravity on the brane becomes higher dimensional at super-Hubble distances, which entails that the relation between the acceleration rate and vacuum energy density flips upside down compared to the conventional one. The acceleration rate decreases with increasing energy density. The experimentally acceptable rate is obtained for an energy density larger than (1 TeV)(4). The results are stable under quantum corrections because supersymmetry is broken only on the brane and stays exact in the bulk of infinite-volume extra space. The consistency of 4D gravity and cosmology on the brane requires the quantum gravity scale to be around 10(-3) eV. Testable predictions emerging within this approach are (i) simultaneous modifications of gravity at submillimeter and the Hubble scales and (ii) Hagedorn-type saturation in TeV energy collisions due to the Regge spectrum with a spacing equal to 10(-3) eV.