Second-order energy-momentum tensor of a scalar field
- 등재 SCIE, SCOPUS
- OA유형 All Open Access, Green
- 발행기관 American Physical Society
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000194448
- 본문언어 영어
- Published As https://doi.org/10.1103/PhysRevD.106.084027
초록/요약
We investigate the second-order effective energy-momentum tensor (2EMT) constructed by the quadratic terms of the linear scalar cosmological perturbations while the universe is dominated by a scalar field. We show that 2EMT is gauge dependent. We then study 2EMT in three (longitudinal, spatially flat, and comoving) gauge conditions in the slow-roll stage of inflation. We find that 2EMT exhibits an effective fluid of w=-1/3 on superhorizon scales in all of those gauge conditions. © 2022 American Physical Society.
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