期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/03/058
关键词
modified gravity; big bang nucleosynthesis; particle physics - cosmology connection
资金
- Royal Society
- STFC
- South African Research Chairs Initiative of the Department of Science and Technology
- National Research Foundation of South Africa
- Competitive Programme for Rated Researchers [91552]
- Innovation PhD studentship
- South African National Institute for Theoretical Physics (NITheP)
- STFC [ST/L000393/1] Funding Source: UKRI
- Science and Technology Facilities Council [1501959, 1208335, ST/L000393/1] Funding Source: researchfish
Recently, it was argued that the conformal coupling of the chameleon to matter fields created an issue for early universe cosmology. As standard model degrees of freedom become non-relativistic in the early universe, the chameleon is attracted towards a surfing solution, so that it arrives at the potential minimum with too large a velocity. This leads to rapid variations in the chameleon's mass and excitation of high energy modes, casting doubts on the classical treatment at Big Bang Nucleosynthesis. Here we present the DBI chameleon, a consistent high energy modification of the chameleon theory that dynamically renders it weakly coupled to matter during the early universe thereby eliminating the adverse effects of the 'kicks'. This is done without any fine tuning of the coupling between the chameleon and matter fields, and retains its screening ability in the solar system. We demonstrate this explicitly with a combination of analytic and numerical results.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据