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arXiv 1208.0838hep-thgr-qc
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关于量子引力中拓扑跃迁的抑制

On suppression of topological transitions in quantum gravity

A. O. Barvinsky

摘要:

本文讨论了当欧几里德量子引力(EQG)被看作是洛伦兹签名时空中物理理论的衍生物时,对宇宙学中一类特殊拓扑构形的动力学抑制效应。在拓扑水平上,EQG继承了洛伦兹理论的时间箭头,并结合了量子场的量子涨落使这种拓扑的贡献消失的特殊结条件。这种效应比最近提出的在共形场论驱动的量子宇宙学的微正则统计和中抑制真空无边界瞬子的共形机制更普遍。与CFT驱动宇宙学的共形性质相反,这种效应仅基于局域玻色子场的短距离行为和费米子的泡利原理。将这种效应应用于CFT宇宙学中作为暴胀宇宙的初始条件,表明了CMB各向异性的原始功率谱的热性质。这可能是造成该光谱的红色倾斜的热贡献的原因,除了其传统的真空分量之外。

英文摘要:

We discuss the effect of dynamical suppression for a special class of topological configurations in cosmology, which occur in Euclidean quantum gravity (EQG) when the latter is viewed as the derivative of the physical theory in the Lorentzian signature spacetime. At the topological level EQG inherits from the Lorentzian theory the arrow of time and incorporates special junction conditions on quantum fields whose quantum fluctuations make the contribution of such topologies vanishing. This effect is more general than the recently suggested conformal mechanism of suppression of vacuum no-boundary instantons in the microcanonical statistical sum of quantum cosmology driven by a conformal field theory (CFT). In contrast to conformal properties of the CFT driven cosmology, this effect is based only on short-distance behavior of local boson fields and Pauli principle for fermions. Application of this effect in the CFT cosmology treated as initial conditions for inflationary Universe suggests the thermal nature of the primordial power spectrum of the CMB anisotropy. This can be responsible for a thermal contribution to the red tilt of this spectrum, additional to its conventional vacuum component.

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