Some like it hot: R2 heals Higgs inflation, but does not cool it
Some like it hot: R2 heals Higgs inflation, but does not cool it
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DOI：
10.1016/j.physletb.2019.06.064
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发表时间：
2019-04
影响因子：
4.4
通讯作者：
Fedor Bezrukov;D. Gorbunov;C. Shepherd;A. Tokareva
中科院分区：
文献类型：
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作者：
Fedor Bezrukov;D. Gorbunov;C. Shepherd;A. Tokareva
高能希格斯暴涨的强耦合阻碍了对暴涨、再热和低能动力学的联合描述。通过对模型进行适当的UV补全，这种情况可能会得到改善。一种定义明确的自洽方法是在作用中引入R2项.在这个修正的模型中，强耦合标度恢复到普朗克标度，这证明了在研究膨胀后的模型动力学时使用微扰方法是合理的。我们研究了后膨胀宇宙的再热，它涉及两个高度非谐的振子：齐次希格斯场和标量子。我们观察到，在模型参数空间的有趣区域，这些振荡使弱规范玻色子的纵向分量变得超速，在比哈勃时间短得多的时间尺度上触发瞬时预热。弱规范玻色子很重，很快就会衰变成轻的标准模型粒子，确保了暴涨之后辐射主宰时代的开始。
Strong coupling in Higgs inflation at high energies hinders a joint description of inflation, reheating and low-energy dynamics. The situation may be improved with a proper UV completion of the model. A well-defined self-consistent way is to introduce an R 2-term into the action. In this modified model the strong coupling scale returns back to the Planck scale, which justifies the use of the perturbative methods in studies of the model dynamics after inflation. We investigate the reheating of the post-inflationary Universe, which involves two highly anharmonic oscillators strongly interacting with each other: homogeneous Higgs field and scalaron. We observe that in interesting regions of model parameter space these oscillations make longitudinal components of the weak gauge bosons tachyonic, triggering instant preheating at timescales much shorter than the Hubble time. The weak gauge bosons are heavy and decay promptly into light Standard Model particles, ensuring the onset of the radiation domination era right after inflation.