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arXiv 0805.4091hep-thastro-phgr-qc
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真空能量密度的高维微扰

Higher-dimensional perturbations of the vacuum energy density

M. Gasperini

摘要:

由存在于膜上的(标准模型)场的超对称性破缺所产生的真空能量密度不能完全“卸载”到体:即使假设存在有效的“自调谐”机制,一小部分转移的能量“聚束”回膜,作为超对称性破缺引力传递到体的逆反应。在这种情况下,膜的超对称尺度必须有界,以保证这种剩余能量密度与当前大尺度现象学约束的一致性。这种效果是通过计算的零点能量的塔(高维)大量的状态相关的张量度量波动的膜嵌入在一个扭曲的散装几何,它被证明是独立的数量紧凑或非紧凑的额外的维度。

英文摘要:

The vacuum energy density arising from the broken supersymmetry of the (standard-model) fields living on a brane cannot be fully "off-loaded" to the bulk: even assuming the existence of an effective "self-tuning" mechanism, a small fraction of the transferred energy "bunces back" to the brane, as a backreaction of the supersymmetry breaking gravitationally transmitted to the bulk. In that case the SUSY scale of the brane has to be bounded, to guarantee the consistency of such a residual energy density with current large-scale phenomonological constraints. This effect is illustrated by computing the zero-point energies of the tower of (higher-dimensional) massive states associated to tensor metric fluctuations on a brane embedded in a warped bulk geometry, and it is shown to be independent of the number of compact or non-compact extra dimensions.

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