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Relaxation of the Cosmological Constant
- Source :
- Phys. Rev. D 100, 015048 (2019)
- Publication Year :
- 2019
-
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.<br />Comment: 13 pages, 3 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 100, 015048 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1902.06793
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.100.015048