Fermion production from preheating-amplified metric perturbations

Bruce A. Bassett; Marco Peloso; Lorenzo Sorbo; Shinji Tsujikawa

doi:10.1016/S0550-3213(01)00608-3

Fermion production from preheating-amplified metric perturbations

Bruce A. Bassett, Marco Peloso, Lorenzo Sorbo, Shinji Tsujikawa^*

^*Corresponding author for this work

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

11 Citations (Scopus)

Abstract

We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) background. These perturbations can be large during preheating, breaking the conformal flatness of the background spacetime. We compute numerically the total number of particles generated by the modes of the metric perturbations which have grown sufficiently to become classical. In the absence of inhomogeneities massless fermions are not gravitationally produced, and then this effect may be relevant for abundance estimates of light gravitational relics.

Original language	English
Pages (from-to)	393-415
Number of pages	23
Journal	Nuclear Physics B
Volume	622
Issue number	1-2
DOIs	https://doi.org/10.1016/S0550-3213(01)00608-3
Publication status	Published - 2002 Feb 4
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/S0550-3213(01)00608-3

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title = "Fermion production from preheating-amplified metric perturbations",

abstract = "We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) background. These perturbations can be large during preheating, breaking the conformal flatness of the background spacetime. We compute numerically the total number of particles generated by the modes of the metric perturbations which have grown sufficiently to become classical. In the absence of inhomogeneities massless fermions are not gravitationally produced, and then this effect may be relevant for abundance estimates of light gravitational relics.",

author = "Bassett, {Bruce A.} and Marco Peloso and Lorenzo Sorbo and Shinji Tsujikawa",

note = "Funding Information: The authors thank J{\"u}rgen Baacke and Fermin Viniegra for contributions at early stages of this project and Robert H. Brandenberger for comments on the draft. S.T. also thanks Alexei A. Starobinsky and Jun'ichi Yokoyama for useful discussions. S.T. is thankful for financial support from the JSPS (No. 04942). The work of M.P. is supported by the European Commission RTN programmes HPRN-CT-2000-00148 and 00152. M.P. thanks Lev Kofman for some useful discussions. He also thanks the Canadian Institute for Theoretical Astrophysics of Toronto and the Astrophysics group of Fermilab for their friendly hospitality during the early stages of this work.",

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doi = "10.1016/S0550-3213(01)00608-3",

language = "English",

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T1 - Fermion production from preheating-amplified metric perturbations

AU - Bassett, Bruce A.

AU - Peloso, Marco

AU - Sorbo, Lorenzo

AU - Tsujikawa, Shinji

N1 - Funding Information: The authors thank Jürgen Baacke and Fermin Viniegra for contributions at early stages of this project and Robert H. Brandenberger for comments on the draft. S.T. also thanks Alexei A. Starobinsky and Jun'ichi Yokoyama for useful discussions. S.T. is thankful for financial support from the JSPS (No. 04942). The work of M.P. is supported by the European Commission RTN programmes HPRN-CT-2000-00148 and 00152. M.P. thanks Lev Kofman for some useful discussions. He also thanks the Canadian Institute for Theoretical Astrophysics of Toronto and the Astrophysics group of Fermilab for their friendly hospitality during the early stages of this work.

PY - 2002/2/4

Y1 - 2002/2/4

N2 - We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) background. These perturbations can be large during preheating, breaking the conformal flatness of the background spacetime. We compute numerically the total number of particles generated by the modes of the metric perturbations which have grown sufficiently to become classical. In the absence of inhomogeneities massless fermions are not gravitationally produced, and then this effect may be relevant for abundance estimates of light gravitational relics.

AB - We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) background. These perturbations can be large during preheating, breaking the conformal flatness of the background spacetime. We compute numerically the total number of particles generated by the modes of the metric perturbations which have grown sufficiently to become classical. In the absence of inhomogeneities massless fermions are not gravitationally produced, and then this effect may be relevant for abundance estimates of light gravitational relics.

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SP - 393

EP - 415

JO - Nuclear Physics B

JF - Nuclear Physics B

IS - 1-2

ER -

Fermion production from preheating-amplified metric perturbations

Abstract

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