Second-order energy-momentum tensor of a scalar field
General Relativity and Quantum Cosmology
2022-06-24 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
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 super-horizon scales in all of those gauge conditions.
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Cite
@article{arxiv.2206.11530,
title = {Second-order energy-momentum tensor of a scalar field},
author = {Inyong Cho and Jinn-Ouk Gong and Seung Hun Oh},
journal= {arXiv preprint arXiv:2206.11530},
year = {2022}
}
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12 pages