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arXiv 1003.3975gr-qchep-th
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虫洞和子宇宙

Wormholes and Child Universes

E. I. Guendelman

摘要:

证据的情况下,经典引力提供了线索,使量子引力的意义。关键的观察是经典引力子宇宙解或“几乎”解的存在,“几乎”是因为一些奇异性问题。这些子宇宙解的困难是由于它们的一般奇异性问题,很可能通过量子效应来解决,就像“几乎”瞬子解在规范理论中与共形不变性的破缺有关一样。讨论了在经典水平上也不存在这些奇异性问题的广义相对论的一些很好的修正。在包括量子引力在内的量子场论中,高能量密度激发导致了紫外线发散,这很可能是子宇宙的来源,子宇宙将它们带出了原始的时空。这种解耦可以防止这些高UV激发对物理振幅产生任何影响。因此,子宇宙的产生可能是考虑半经典引力效应的量子场论中紫外正则化的原因。子宇宙的生产在最后阶段的黑洞蒸发,预测没有translanckian原始扰动,连接到最小长度假设,特别是连接到最大曲率假设进行了讨论。讨论了Kaluza Klein激发下的超激发态。最后,讨论了从与子宇宙相关的虫洞中获得“类弦”效应的可能性。

英文摘要:

Evidence to the case that classical gravitation provides the clue to make sense out of quantum gravity is presented. The key observation is the existence in classical gravitation of child universe solutions or "almost" solutions, "almost" because of some singularity problems. The difficulties of these child universe solutions due to their generic singularity problems will be very likely be cured by quantum effects, just like for example "almost" instanton solutions are made relevant in gauge theories with breaking of conformal invariance. Some well motivated modifcations of General Relativity where these singularity problems are absent even at the classical level are discussed. High energy density excitations, responsible for UV divergences in quantum field theories, including quantum gravity, are likely to be the source of child universes which carry them out of the original space time. This decoupling could prevent these high UV excitations from having any influence on physical amplitudes. Child universe production could therefore be responsible for UV regularization in quantum field theories which take into account semiclassically gravitational effects. Child universe production in the last stages of black hole evaporation, the prediction of absence of tranplanckian primordial perturbations, connection to the minimum length hypothesis and in particular the connection to the maximal curvature hypothesis are discussed. Some discussion of superexcited states in the case these states are Kaluza Klein excitations is carried out. Finally, the posibility of obtaining "string like" effects from the wormholes associated with the child universes is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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