论文标题
轴心动力学的未对准和参数共振的通货膨胀
Axion Kinetic Misalignment and Parametric Resonance from Inflation
论文作者
论文摘要
标准未对准的斧头冷暗物质通常需要一个衰减常数$ f_a〜 \ gtrsim〜10^{11} $ gev。当radial peccei-quinn（PQ）对称断裂场具有较大的初始值时，动力学的错位和参数共振很容易允许$ f_a $的较低值。在这里，我们考虑通货膨胀对动力学未对准和参数共振的影响。我们假设初始PQ场值是由量子波动确定的，并且由通货膨胀期间的Hubble参数设置，$ H_I $和PQ场质量。 PQ场振荡从温度$ t_r $的通货膨胀完成后或之后开始重新加热之前或之后。我们确定$ f_a $的范围和通货膨胀参数$（H_I，T_R）$与Axion Dark Matter一致，对于PQ字段具有四分之一的潜力。我们发现$ 4 \ times 10^8 $ gev $ <f_a <10^{11} $ gev可以始终如一地产生斧头暗物质。允许的参数空间的很大一部分预测了稀有的kaon衰减，$ k_l \ rightarrow（π^0 + \ rm {丢失\; energy}）$和/或在小尺度上抑制结构形成。
Axion cold dark matter from standard misalignment typically requires a decay constant $f_a~\gtrsim~10^{11}$ GeV. Kinetic misalignment and parametric resonance easily allow lower values of $f_a$ when the radial Peccei-Quinn (PQ) symmetry breaking field takes large initial values. Here, we consider the effects of inflation on kinetic misalignment and parametric resonance. We assume that the initial PQ field value is determined by quantum fluctuations, and is set by the Hubble parameter during inflation, $H_I$, and the PQ field mass. PQ field oscillations begin before or after the completion of reheating after inflation at a temperature $T_R$. We determine the range of $f_a$ and the inflationary parameters $(H_I, T_R)$ consistent with axion dark matter for a quartic potential for the PQ field. We find that $4\times 10^8$ GeV $< f_a < 10^{11}$ GeV can consistently produce axion dark matter. A significant portion of the allowed parameter space predicts rare kaon decays, $K_L \rightarrow (π^0 + \rm{missing \; energy})$, and/or suppression of structure formation on small scales.
