Oscillating solutions of the matter density contrast in Horndeski's theory
| Autor: | Jiro Matsumoto |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
High Energy Physics - Theory
Physics Gravity (chemistry) Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology WKB approximation Galaxy Gravitation Classical mechanics High Energy Physics - Theory (hep-th) 0103 physical sciences Newtonian fluid Dark energy Density contrast Constant (mathematics) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics. 2019:054-054 |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2019/01/054 |
| Popis: | Evolution of the large scale structure of the Universe is described by galaxy bias and the growth rate function of the matter density contrast. The behavior of the growth rate function, in general, depends on the types of dark energy or modified gravity theories, because they modify Poisson's equation for gravity by changing the Newtonian constant in the quasi-static solutions. Whereas, another mode of the matter density contrast "oscillating mode" has not been studied well, although there is a possibility that it drastically changes the gravitational law. In this paper, we will construct the way to investigate oscillating solutions and show the concrete forms of the solutions by using the WKB approximation. Comment: 21 pages, 6 figures. References added, sentences and expressions polished, version to appear in JCAP |
| Databáze: | OpenAIRE |
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