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arXiv 0803.2674hep-thgr-qchep-ph
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热和量子超弦宇宙学

Thermal and quantum superstring cosmologies

Tristan Catelin-Jullien, Costas Kounnas, Herve Partouche, Nicolaos Toumbas

摘要:

我们考虑四维杂化弦背景,其中超对称性通过Scherk-Schwarz机制在内部空间循环和有限温度效应下自发破缺。我们专注于初始平坦的背景,N=4和N=2的超对称量。热修正和量子修正引起了非平凡的宇宙学演化。我们表明,这些修正是在控制和可计算的,由于潜在的无标度结构的有效超引力理论。有效的弗里德曼-哈勃方程包含一个辐射项~1/a^4和一个曲率项~1/a^2,它们的系数是引力子质量标度与温度之比的函数。

英文摘要:

We consider four dimensional heterotic string backgrounds for which supersymmetry is spontaneously broken via the Scherk-Schwarz mechanism on an internal spatial cycle and by finite temperature effects. We concentrate on initially flat backgrounds with N=4 and N=2 amount of supersymmetry. Thermal and quantum corrections give rise to a non-trivial cosmological evolution. We show that these corrections are under control and calculable due to the underlying no-scale structure of the effective supergravity theory. The effective Friedmann-Hubble equation involves a radiation term ~1/a^4 and a curvature term ~1/a^2, whose coefficients are functions of ratio of the gravitino mass scale to the temperature.

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