4 papers
Adiabatic and point-splitting regularization of spin-1/2 field in de Sitter space
Xuan Ye, Yang Zhang
We study the regularization of a spin-1/2 fieldin the vacuum state in de Sitter space. We find that the 2nd order adiabatic regularization is sufficient to remove all UV divergence…
The Conserved Effective Stress Tensor of Gravitational Wave
Yang Zhang, Xuan Ye
We present a detailed study of the effective stress tensor of gravitational wave (GW) as the source for the background Einstein equation and examine three candidates in literature.…
Regularized stress tensor of vector fields in de Sitter space
Yang Zhang, Xuan Ye
We study the Stueckelberg field in de Sitter space, which is a massive vector field with the gauge fixing (GF) term . We obtain the vacuum stress…
Maxwell field with gauge fixing term in the radiation- and matter-dominant stages: exact solution and stress tensor
Xuan Ye, Yang Zhang
We study the Maxwell field with a general gauge fixing (GF) term in the radiation-dominant (RD) and matter-dominant (MD) stages of expanding Universe, as a continuation to the prev…