论文标题
Riemann耦合的螺旋磁场
Helical magnetic fields from Riemann coupling
论文作者
论文摘要
我们研究了从riemann耦合与电磁场的螺旋磁场的通货膨胀产生。文献中的大多数模型都将非最小耦合引入具有标量场的电磁场，因此破坏了保形不变性。在这项工作中，我们表明与riemann张量的非最小耦合在所有可观察的尺度上都会产生足够的原始螺旋磁场。我们明确地表明，螺旋状状态之一衰变，而另一种螺旋模式增加，导致净非零螺旋性。我们的模型具有三个关键特征：〜（i）螺旋力量光谱具有轻微的红色倾斜度，可缓慢滚动通货膨胀，与观察值的边界一致，而没有反应问题，（ii）生成的螺旋场的能量密度至少比标量的模型和（iii II III）固定型号的范围比标量较大的模型大于标量范围的范围，该型号是固定模型的，该模型是固定的。重新加热动态。我们表明，我们的模型在MPC量表上生成了强度0.01 Picogauss的磁场。
We study the inflationary generation of helical magnetic fields from the Riemann coupling with the electromagnetic field. Most models in the literature introduce non-minimal coupling to the electromagnetic fields with a scalar field, hence, breaking the conformal invariance. In this work, we show that non-minimal coupling to the Riemann tensor generates sufficient primordial helical magnetic fields at all observable scales. We explicitly show that one of the helical states decay while the other helical mode increases, leading to a net non-zero helicity. Our model has three key features:~(i) the helical power-spectrum has a slight red-tilt for slow-roll inflation consistent with bounds from observations and free from backreaction problem, (ii) the energy density of the helical fields generated is at least one order of magnitude larger than the scalar-field coupled models, and (iii) unlike the scalar field coupled models, the generated helical fields are insensitive to the reheating dynamics. We show that our model generates the magnetic field of strength 0.01 PicoGauss over Mpc scale.
