Must cosmological perturbations remain nonadiabatic after multifield inflation
Must cosmological perturbations remain nonadiabatic after multifield inflation
复制标题
多场暴胀后宇宙扰动必须保持非绝热吗
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Weinberg
中科院分区：
文献类型：
--
作者：
S. Weinberg
即使在多场暴胀中产生了非绝热扰动，如果暴胀后的宇宙进入局部热平衡时代，没有非零守恒量，那么这些扰动将成为绝热的，并且只要波长在视界之外，即使局部热平衡不再适用，这些扰动也将保持绝热。当重子是由大质量粒子的非平衡衰变产生的，或者当暗物质粒子脱离局部热平衡时，与不完美局部热平衡相关的小的初始非绝热扰动仍然很小。
Even if nonadiabatic perturbations are generated in multifield inflation, the perturbations will become adiabatic if the Universe after inflation enters an era of local thermal equilibrium, with no nonzero conserved quantities, and will remain adiabatic as long as the wavelength is outside the horizon, even when local thermal equilibrium no longer applies. Small initial nonadiabatic perturbations associated with imperfect local thermal equilibrium remain small when baryons are created from out-of-equilibrium decay of massive particles, or when dark matter particles go out of local thermal equilibrium.