Can cosmological perturbations produce early universe vorticity?
Can cosmological perturbations produce early universe vorticity?
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DOI：
10.1088/0264-9381/28/11/114004
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发表时间：
2010-10
影响因子：
3.5
通讯作者：
Adam J. Christopherson;Karim A. Malik
中科院分区：
文献类型：
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作者：
Adam J. Christopherson;Karim A. Malik
在这篇特刊论文中，基于 GR19 会议 B5（理论和数学宇宙学）中的同名演讲，我们回顾了使用宇宙学微扰理论在宇宙学中产生涡量的案例。我们表明，虽然在线性阶上，涡度演化方程在没有各向异性应力的情况下没有源项，但在二阶涡度上，涡度源自熵和能量密度扰动的梯度。然后，我们使用能量密度和熵扰动的简单输入功率谱，对涡度功率谱的幅度和尺度依赖性进行一些估计。最后，我们以未来工作的可能方向作为结束，然后对由此产生的涡量的观测重要性以及原始磁场产生的可能性提出一些暗示。
In this special issue paper, based on the talk with the same title as in session B5 (Theoretical and Mathematical Cosmology) at GR19, we review the case of vorticity generation in cosmology using cosmological perturbation theory. We show that, while at linear order the vorticity evolution equation has no source term in the absence of anisotropic stress, at second order vorticity is sourced by gradients in entropy and energy density perturbations. We then present some estimates for the magnitude and scale dependence of the vorticity power spectrum using simple input power spectra for the energy density and entropy perturbations. Finally, we close with possible directions for future work followed by some hints towards the observational importance of the vorticity so generated, and the possibility of primordial magnetic field generation.