Second-order energy-momentum tensor of a scalar field

Inyong Cho; Jinn Ouk Gong; Seung Hun Oh

doi:10.1103/PhysRevD.106.084027

Second-order energy-momentum tensor of a scalar field

Inyong Cho, Jinn Ouk Gong, Seung Hun Oh

School of Natural Sciences

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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 superhorizon scales in all of those gauge conditions.

Original language	English
Article number	084027
Journal	Physical Review D
Volume	106
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevD.106.084027
State	Published - 15 Oct 2022

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10.1103/PhysRevD.106.084027

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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 superhorizon scales in all of those gauge conditions.",

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AB - 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.

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Second-order energy-momentum tensor of a scalar field

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