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arXiv 0710.5734astro-phgr-qchep-th
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圈量子引力中的Dirac场与大爆炸核合成

Dirac Fields in Loop Quantum Gravity and Big Bang Nucleosynthesis

Martin Bojowald, Rupam Das, Robert J. Scherrer

摘要:

大爆炸核合成需要在光子和相对论费米子的状态方程之间保持良好的平衡。状态方程参数的几个修正来自经典和量子物理学,这里从正则的角度导出。特别地,圈量子引力允许计算麦克斯韦和狄拉克场的量子引力修正。虽然经典作用量非常不同,但对状态方程的量子修正非常相似。最低阶,这些修正采取的形式的一个整体的膨胀依赖的乘法因子的总密度。我们使用这些结果,随着大爆炸核合成的预测,这些修正的界限。

英文摘要:

Big Bang nucleosynthesis requires a fine balance between equations of state for photons and relativistic fermions. Several corrections to equation of state parameters arise from classical and quantum physics, which are derived here from a canonical perspective. In particular, loop quantum gravity allows one to compute quantum gravity corrections for Maxwell and Dirac fields. Although the classical actions are very different, quantum corrections to the equation of state are remarkably similar. To lowest order, these corrections take the form of an overall expansion-dependent multiplicative factor in the total density. We use these results, along with the predictions of Big Bang nucleosynthesis, to place bounds on these corrections.

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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