Wu Fengquan; Li Yichao; Lu Youjun; Chen Xuelei
Source Publicationsciencechinaphysicsmechanicsastronomy
AbstractCombining the latest Planck, Wilkinson Microwave Anisotropy Probe (WMAP), and baryon acoustic oscillation (BAO) data, we exploit the recent cosmic microwave background (CMB) B-mode power spectra data released by the BICEP2 collaboration to constrain the cosmological parameters of the LCDM model, especially the primordial power spectra parameters of the scalar and the tensor modes, n_s, a_s, r, n_t. We obtain constraints on the parameters for a lensed LCDM model using the Markov Chain Monte Carlo (MCMC) technique, the marginalized 68% bounds are r = 0.1043_(-0.0914)~(+0.0307), n_s = 0.9617_(-0.0061)~(+0.0061), a_s = -0.0175_(-0.0097)~(+0.0105), n_t = 0.5198_(-0.4579)~(+0.4515). We find that a blue tilt for nt is favored slightly, but it is still well consistent with flat or even red tilt. Our r value is slightly smaller than the one obtained by the BICEP group, in that we permit nt as a free parameter without imposing the single-field slow roll inflation consistency relation. When we impose this relation, then r=0.2130_(-0.0609)~(+0.0446). For most other parameters, the best fit values and measurement errors are not altered significantly by the introduction of the BICEP2 data.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wu Fengquan,Li Yichao,Lu Youjun,et al. cosmologicalparameterfittingswiththebicep2data[J]. sciencechinaphysicsmechanicsastronomy,2014,57(8):1449.
APA Wu Fengquan,Li Yichao,Lu Youjun,&Chen Xuelei.(2014).cosmologicalparameterfittingswiththebicep2data.sciencechinaphysicsmechanicsastronomy,57(8),1449.
MLA Wu Fengquan,et al."cosmologicalparameterfittingswiththebicep2data".sciencechinaphysicsmechanicsastronomy 57.8(2014):1449.
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