GW170817兼容的爱因斯坦-高斯-博内特暴胀中的绝热扰动
Adiabatic Perturbations in GW170817-Compatible Einstein-Gauss-Bonnet Inflation
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中文总结 AI 辅助
本文研究与GW170817兼容的EGB暴胀理论的绝热性，推导其物理参数约束，发现仅一类该类理论无绝热性病态。
中文摘要 AI 辅助
我们在暴胀爱因斯坦-高斯-博内特（Einstein-Gauss-Bonnet，EGB）理论框架下研究宇宙学扰动的绝热性，聚焦于既符合当前宇宙微波背景辐射实验、又与GW170817观测兼容的可行EGB暴胀理论。我们推导了绝热性要求对EGB物理参数的约束，证明标量扰动的声速和张量扰动的传播速度均受限制。我们考虑两类可行且与GW170817兼容的暴胀理论：第一类在暴胀期间未违反绝热性，第二类仅在暴胀结束时违反绝热性，并讨论了第二类模型中绝热性违反的影响。分析表明，仅一类可行的EGB暴胀理论（同时与GW170817事件兼容）不存在绝热性病态。
英文摘要
We study the adiabaticity of the cosmological perturbations in the context of inflationary Einstein-Gauss-Bonnet theories. We focus on viable inflationary Einstein-Gauss-Bonnet theories which are compatible with the current Cosmic Microwave Background radiation experiments and also are compatible with the GW170817 observations. We derive the effects of the adiabaticity requirement on the Einstein-Gauss-Bonnet physical parameters and we show that the sound speed of the scalar perturbations and the propagation speed of the tensor perturbations are constrained. We consider two classes of inflationary viable and GW170817-compatible theories, and in the first class the adiabaticity is not violated during inflation, while in the second class the adiabaticity is violated only at the end of inflation. We discuss the effects of the adiabaticity violation in the second class of models. From our analysis, it seems that only one class of viable EGB inflationary theories, which is also compatible with the GW170817 event, is free from adiabaticity pathologies.
