论文标题
度量扰动的重力瘦素发生
Gravitational leptogenesis from metric perturbations
论文作者
论文摘要
在这项工作中，我们观察到，可以在不调用加拉顿扇区中新的轴向耦合的情况下实施重力瘦素发生机制。我们表明，在通货膨胀后出现的Robertson-Walker背景中，时空度量本身会破坏平等对称性，并产生一种非驱动的Pontryagin密度，该密度可以产生物质 - 抗逆性不对称性。我们分析了不同通货膨胀和再加热方案中产生的不对称性。我们表明，在某些情况下，生成的不对称性可以与观测值相提并论，尽管物质 - 抗后分区域的大小通常比当前的哈勃半径小得多。
In this work we make the observation that the gravitational leptogenesis mechanism can be implemented without invoking new axial couplings in the inflaton sector. We show that in the perturbed Robertson-Walker background emerging after inflation, the spacetime metric itself breaks parity symmetry and generates a non-vansihing Pontryagin density which can produce a matter-antimatter asymmetry. We analyze the produced asymmetry in different inflationary and reheating scenarios. We show that the generated asymmetry can be locally comparable to observations in certain cases, although the size of the matter-antimatter regions is typically much smaller than the present Hubble radius.
