期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2007/10/006
关键词
dark energy theory; cosmology with extra dimensions; gravity
We show how to construct consistent braneworld models which exhibit late time acceleration. Unlike self-acceleration, which has a de Sitter vacuum state, our models have the standard Minkowski vacuum and accelerate only in the presence of matter, which we dub 'stealth acceleration'. We use an effective action for the brane which includes an induced gravity term, and allow for an asymmetric set-up. We study the linear stability of. at brane vacua and find the regions of parameter space where the set-up is stable. The four-dimensional graviton is only quasi-localized in this set-up and as a result gravity is modified at late times. One of the two regions is strongly coupled and the scalar mode is eaten up by an extra symmetry that arises in this limit. Having filtered the well-defined theories we then focus on their cosmology. When the graviton is quasi-localized we find two main examples of acceleration. In each case, we provide an illustrative model and compare it to Lambda CDM.
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