arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.4227hep-phastro-ph
收藏

膜宇宙学与KK引力子

Brane Cosmology and KK Gravitinos

C. Bambi, F. R. Urban

摘要:

考虑了额外维模型中KK引力子的宇宙学。主要结果是,这种KK模式的产生是不兼容的时代的非标准膨胀后的通货膨胀。这是因为零模上的BBN约束迫使约化的五维普朗克质量$M_5$降到比通常的四维质量小得多的值,但这又意味着在给定温度下有许多KK态可用。一旦考虑到这些状态,人们发现不存在产生的KK引力子满足BBN和过闭合约束的$M_5$。这一结论适用于只有引力在整个时空中传播的平坦模型和弯曲模型。

英文摘要:

The cosmology of KK gravitinos in models with extra dimensions is considered. The main result is that the production of such KK modes is not compatible with an epoch of non--standard expansion after inflation. This is so because the BBN constraint on the zero mode forces the reduced five dimensional Planck mass $M_5$ down to values much smaller than the usual four dimensional one, but this in turn implies many KK states available for a given temperature. Once these states are taken into account one finds that there is no $M_5$ for which the produced KK gravitinos satisfy BBN and overclosure constraints. This conclusion holds for both flat and warped models in which only gravity propagates in the full spacetime.

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。

↑