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arXiv 2308.00564hep-phastro-ph.COgr-qc
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收缩暖小暴胀子

Shrinking the Warm Little Inflaton

Paulo B. Ferraz, João G. Rosa

AI总结:

本文提出通过暴胀子与单一费米子自由度的耗散相互作用实现暖暴胀,证明慢滚参数振荡的平均效应被抑制且不影响CMB尺度,从而简化了“Warm Little Inflaton”模型并去除了额外对称性要求。

摘要:

我们表明,只要单一费米子自由度的质量是暴胀子场值的振荡函数,暖暴胀就能通过暴胀子与该费米子自由度之间的耗散相互作用,在高温区域成功实现。特别地,我们证明,尽管慢滚参数 eta 会因此产生大幅振荡,但其平均效应被充分抑制,从而允许慢滚轨迹的存在。此外,我们证明,尽管这也会引发参数共振并放大暴胀子扰动,但在相关参数范围内,其对 CMB 尺度的影响可忽略不计。因此,“Warm Little Inflaton”场景可以在减少一个费米子自由度且无需施加额外离散交换对称性的情况下实现。

英文摘要:

We show that warm inflation can be successfully realized in the high temperature regime through dissipative interactions between the inflaton and a single fermionic degree of freedom, provided that the latter's mass is an oscillatory function of the inflaton field value. We demonstrate, in particular, that despite the consequent large amplitude oscillations of the eta slow-roll parameter, their effect is, on average, sufficiently suppressed to allow for a slow-roll trajectory. In addition, we demonstrate that, even though this also induces a parametric resonance that amplifies inflaton perturbations, this has a negligible effect on CMB scales in the relevant parametric range. Hence, the "Warm Little Inflaton" scenario can be realized with one less fermionic degree of freedom and no need of imposing an additional discrete interchange symmetry.

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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