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arXiv 0707.2177hep-phastro-ph
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微分耦合暴胀模型中的预热问题

Preheating in Derivatively-Coupled Inflation Models

Cristian Armendariz-Picon, Mark Trodden, Eric J. West

摘要:

我们研究了暴胀子与标量场和规范场耦合的理论中的预热。这种耦合可能在暴胀的自然模型中占主导地位,其中暴胀子势的平坦性与暴胀子的近似移位对称性有关。我们比较我们的结果与以前研究的模型与非导数耦合。对于足够重的标量物质,参数共振在再加热宇宙方面是无效的,因为暴胀子与物质的耦合非常弱。如果标量物质场是光,导数耦合会导致轻微的长波长不稳定性,使物质场达到非零期望值。然而,在这种情况下,光标量的长波长波动在膨胀过程中产生,导致大量的宇宙学问题。相反地,暴胀子与规范场的类轴子耦合,在暴胀期间不会导致长波长涨落的产生。然而,同样由于与暴胀子的耦合很弱,参量共振在产生规范场量子方面是无效的。

英文摘要:

We study preheating in theories where the inflaton couples derivatively to scalar and gauge fields. Such couplings may dominate in natural models of inflation, in which the flatness of the inflaton potential is related to an approximate shift symmetry of the inflaton. We compare our results with previously studied models with non-derivative couplings. For sufficiently heavy scalar matter, parametric resonance is ineffective in reheating the universe, because the couplings of the inflaton to matter are very weak. If scalar matter fields are light, derivative couplings lead to a mild long-wavelength instability that drives matter fields to non-zero expectation values. In this case however, long-wavelength fluctuations of the light scalar are produced during inflation, leading to a host of cosmological problems. In contrast, axion-like couplings of the inflaton to a gauge field do not lead to production of long-wavelength fluctuations during inflation. However, again because of the weakness of the couplings to the inflaton, parametric resonance is not effective in producing gauge field quanta.

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