Relaxation of the cosmological constant
Abstract
We present a model that naturally tunes a large positive cosmological constant to a small cosmological constant. A slowly rolling scalar field decreases the cosmological constant to a small negative value, causing the universe to contract, thus reheating it. An expanding universe with a small positive cosmological constant can be obtained, respectively, by coupling this solution to any model of a cosmological bounce and coupling the scalar field to a sector that undergoes a technically natural phase transition at the meV scale. A robust prediction of this model is a rolling scalar field today with some coupling to the standard model. This can potentially be experimentally probed in a variety of cosmological and terrestrial experiments, such as probes of the equation of state of dark energy, birefringence in the cosmic microwave background and terrestrial tests of Lorentz violation.
- Authors:
- Publication Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); Betty Moore Foundation
- OSTI Identifier:
- 1545956
- Alternate Identifier(s):
- OSTI ID: 1611728
- Grant/Contract Number:
- SC0012012; 100495; PHY-1638509; PHY-1507160; PHY-1720397; PHY-1214000; GBMF7946
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 1; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics; Cosmological constant
Citation Formats
Graham, Peter W., Kaplan, David E., and Rajendran, Surjeet. Relaxation of the cosmological constant. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.100.015048.
Graham, Peter W., Kaplan, David E., & Rajendran, Surjeet. Relaxation of the cosmological constant. United States. https://doi.org/10.1103/PhysRevD.100.015048
Graham, Peter W., Kaplan, David E., and Rajendran, Surjeet. Tue .
"Relaxation of the cosmological constant". United States. https://doi.org/10.1103/PhysRevD.100.015048.
@article{osti_1545956,
title = {Relaxation of the cosmological constant},
author = {Graham, Peter W. and Kaplan, David E. and Rajendran, Surjeet},
abstractNote = {We present a model that naturally tunes a large positive cosmological constant to a small cosmological constant. A slowly rolling scalar field decreases the cosmological constant to a small negative value, causing the universe to contract, thus reheating it. An expanding universe with a small positive cosmological constant can be obtained, respectively, by coupling this solution to any model of a cosmological bounce and coupling the scalar field to a sector that undergoes a technically natural phase transition at the meV scale. A robust prediction of this model is a rolling scalar field today with some coupling to the standard model. This can potentially be experimentally probed in a variety of cosmological and terrestrial experiments, such as probes of the equation of state of dark energy, birefringence in the cosmic microwave background and terrestrial tests of Lorentz violation.},
doi = {10.1103/PhysRevD.100.015048},
journal = {Physical Review D},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}
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https://doi.org/10.1103/PhysRevD.100.015048
https://doi.org/10.1103/PhysRevD.100.015048
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