期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP10(2012)066
关键词
Cosmology of Theories beyond the SM; Classical Theories of Gravity
资金
- Research Council of Norway FRINAT [197251/V30]
- [CERN/FP/123615/2011]
- [PTDC/FIS/111725/2009]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/111725/2009] Funding Source: FCT
Motivated by the couplings of the dilaton in four-dimensional effective actions, we investigate the cosmological consequences of a scalar field coupled both to matter and a Maxwell-type vector field. The vector field has a background isotropy-violating component. New anisotropic scaling solutions which can be responsible for the matter and dark energy dominated epochs are identified and explored. For a large parameter region the universe expands almost isotropically. Using that the CMB quadrupole is extremely sensitive to shear, we constrain the ratio of the matter coupling to the vector coupling to be less than 10(-5). Moreover, we identify a large parameter region, corresponding to a strong vector coupling regime, yielding exciting and viable cosmologies close to the Lambda CDM limit.
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