Adiabatic renormalization of the stress-energy tensor for spin-1/2 fields.

Spanish Relativity Meeting: almost 100 years after Einstein's revolution

Torrentí, Francisco^1

Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, Madrid

28049, Spain^1

关键词: Cold matter;    Expectation values;    Generic expression;    Renormalization;    Renormalization methods;    Stress-energy tensor;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/600/1/012029/pdf
DOI  :  10.1088/1742-6596/600/1/012029

来源: IOP

【 摘 要 】

We review the adiabatic renormalization method for spin-1/2 fields in FLRW spacetimes, emphasizing its similarities and differences with the scalar case. With it, we obtain a generic expression for the renormalized expectation value of the stress-energy tensor and analyze its properties. We particularize this result to de Sitter and radiation-dominated universes, recovering in the second case the equations of cold matter for late times.