Cosmology with axionic-quintessence coupled with dark matter

We study the possibility of explaining the late time acceleration with an axion field which is coupled with the dark matter sector of the energy budget of the Universe. The axion field arises from the Ramond-Ramond sector of the Type-IIB string theory. We study the background evolution of the Univer...

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Bibliographic Details
Published inClassical and quantum gravity Vol. 30; no. 15; pp. 1 - 12
Main Authors Kumar, Sumit, Panda, Sudhakar, Sen, Anjan A
Format Journal Article
LanguageEnglish
Published IOP Publishing 07.08.2013
Subjects
Cosmology
dark energy
Dark matter
Deviation
Evolution
Joining
Perturbation methods
Quantum gravity
string theory
Universe
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Summary:We study the possibility of explaining the late time acceleration with an axion field which is coupled with the dark matter sector of the energy budget of the Universe. The axion field arises from the Ramond-Ramond sector of the Type-IIB string theory. We study the background evolution of the Universe as well as the growth of the matter perturbation in the linear regime. We subsequently use the observational data from Sn-Ia, BAO measurements, measurements of the Hubble parameter as well as the observational data for the growth of the matter perturbation to constrain our model. Our results show that coupled axion models are allowed to have larger deviation from the cosmological constant by the present observational data. Communicated by P R L V Moniz
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ISSN:0264-9381
1361-6382
DOI:10.1088/0264-9381/30/15/155011