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Author Lee, Seokcheon ♦ Liu, Guo-chin ♦ Ng, Kin-wang
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2009-10-12
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics - Cosmology and Nongalactic Astrophysics ♦ physics:astro-ph
Abstract We investigate the effects of the nonminimal coupling between the scalar field dark energy (quintessence) and the dark matter on the two- point correlation function. It is well known that this coupling shifts the turnover scale as well as suppresses the amplitude of the matter power spectrum. However, these effects are too small to be observed when we limit the coupling strength to be consistent with observations. Since the coupling of quintessence to baryons is strongly constrained, species dependent coupling may arise. This results in a baryon bias that is dif- ferent from unity. Thus, we look over the correlation function in this coupled model. We find that even the non-coupled quintessence model gives the better fit to the correlation function compared to the cosmo- logical constant model. We are also able to observe the enhancement of the baryon acoustic oscillation (BAO) peak due to the increasing bias factor of baryon from this species dependent coupling. In order to avoid the damping effect of the BAO signature in the matter power spectrum due to nonlinear clustering, we consider the coupling effect on the BAO bump in the linear regime. This provides an alternative method to constrain the coupling of dark energy to dark matter.
Description Comment: 10 pages, 5 figures, To match the version accepted by Physical Review D Rapid Communication
Reference: Phys. Rev. D 81. 061302(R), 2010
Educational Use Research
Learning Resource Type Article
Page Count 10


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