Cosmological consequences of classical flavor-space locked gauge field radiation
Cosmological consequences of classical flavor-space locked gauge field radiation
复制标题
经典风味空间锁定规范场辐射的宇宙学后果
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Caldwell
中科院分区：
文献类型：
--
作者：
J. Bielefeld;R. Caldwell
我们提出了一个经典的SU(2)规范场在风味空间锁定构型下作为早期宇宙中的一种辐射，并表明它会在原始随机引力波谱上留下显著的印记。在风味空间锁定构型下，每种风味的电场和磁场与其他风味平行且相互正交，应力能各向同性且均匀。由于非阿贝尔耦合，规范场破坏了左右圆极化引力波之间的对称性。这种手性对称性的破坏导致了一个独特的信号：宇宙微波背景温度和极化的非零交叉相关，$TB$和$EB$，在标准的手性对称情况下，它们都应该为零。我们预测了当前和未来的CMB实验的能力来约束这个模型。此外，根据规范场耦合、丰度以及电场和磁场能量密度的分配，显示出广泛的行为。原始引力波的涨落功率在规范场的涨落中来回振荡。在某些情况下，根据规范场的初始条件，引力波谱被抑制或放大了一个数量级。
We propose a classical SU(2) gauge field in a flavor-space locked configuration as a species of radiation in the early universe, and show that it would have a significant imprint on a primordial stochastic gravitational wave spectrum. In the flavor-space locked configuration, the electric and magnetic fields of each flavor are parallel and mutually orthogonal to other flavors, with isotropic and homogeneous stress-energy. Due to the non-Abelian coupling, the gauge field breaks the symmetry between left- and right-circularly polarized gravitational waves. This broken chiral symmetry results in a unique signal: non-zero cross correlation of the cosmic microwave background temperature and polarization, $TB$ and $EB$, both of which should be zero in the standard, chiral symmetric case. We forecast the ability of current and future CMB experiments to constrain this model. Furthermore, a wide range of behavior is shown to emerge, depending on the gauge field coupling, abundance, and allocation into electric and magnetic field energy density. The fluctuation power of primordial gravitational waves oscillates back and forth into fluctuations of the gauge field. In certain cases, the gravitational wave spectrum is shown to be suppressed or amplified by up to an order of magnitude depending on the initial conditions of the gauge field.