论文标题
粒子物理学和宇宙学模型中的原始引力波
Primordial gravitational waves in a minimal model of particle physics and cosmology
论文作者
论文摘要
In this paper we analyze the spectrum of the primordial gravitational waves (GWs) predicted in the Standard Model*Axion*Seesaw*Higgs portal inflation (SMASH) model, which was proposed as a minimal extension of the Standard Model that addresses five fundamental problems of particle physics and cosmology (inflation, baryon asymmetry, neutrino masses, strong CP problem, and dark matter) in one stroke. SMASH模型对二阶Peccei-Quinn（PQ）相变的临界温度有独特的预测。这样的事件印在通货膨胀期间原始张量的波动的GWS的光谱上，并以$ t \ sim t_c $的形式进入地平线，这对应于$ f \ sim 1 \，\ sim 1 \，\ mathrm {hz} $，指向Future Space-Bone-by offure Space-Beane Gw Ww Gw Ww Gw Ww InterperemortersementersementermentermetermeTers。我们对PQ相变的有效相对论自由度进行了精确估计，并使用它来评估当今观察到的GW频谱。结果表明，未来的高灵敏度GW实验 - 最终decigo-可以探测该模型中PQ相变引起的非平凡特征。
In this paper we analyze the spectrum of the primordial gravitational waves (GWs) predicted in the Standard Model*Axion*Seesaw*Higgs portal inflation (SMASH) model, which was proposed as a minimal extension of the Standard Model that addresses five fundamental problems of particle physics and cosmology (inflation, baryon asymmetry, neutrino masses, strong CP problem, and dark matter) in one stroke. The SMASH model has a unique prediction for the critical temperature of the second order Peccei-Quinn (PQ) phase transition $T_c \sim 10^8\,\mathrm{GeV}$ up to the uncertainty in the calculation of the axion dark matter abundance, implying that there is a drastic change in the equation of state of the universe at that temperature. Such an event is imprinted on the spectrum of GWs originating from the primordial tensor fluctuations during inflation and entering the horizon at $T \sim T_c$, which corresponds to $f \sim 1\,\mathrm{Hz}$, pointing to a best frequency range covered by future space-borne GW interferometers. We give a precise estimation of the effective relativistic degrees of freedom across the PQ phase transition and use it to evaluate the spectrum of GWs observed today. It is shown that the future high sensitivity GW experiment -- ultimate DECIGO -- can probe the nontrivial feature resulting from the PQ phase transition in this model.
