Flavored quantum Boltzmann equations
Flavored quantum Boltzmann equations
复制标题
风味量子玻尔兹曼方程
DOI:
10.1103/physrevd.81.103503
复制
发表时间:
2009
影响因子:
5
通讯作者:
S. Tulin
中科院分区:
文献类型:
--
作者:
V. Cirigliano;Christopher Lee;M. Ramsey;S. Tulin
We derive from first principles, using nonequilibrium field theory, the quantum Boltzmann equations that describe the dynamics of flavor oscillations, collisions, and a time-dependent mass matrix in the early universe. Working to leading nontrivial order in ratios of relevant time scales, we study in detail a toy model for weak-scale baryogenesis: two scalar species that mix through a slowly varying time-dependent and CP-violating mass matrix, and interact with a thermal bath. This model clearly illustrates how the CP asymmetry arises through coherent flavor oscillations in a nontrivial background. We solve the Boltzmann equations numerically for the density matrices, investigating the impact of collisions in various regimes.