We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days...We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days of exposure,no DM particle candidate event was found.This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results.The minimum upper limit,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.展开更多
We apply two geometrical diagnostics, the statefinder {s, r} and Om（x）, to discriminate the Spatial Ricci scalar dark energy model from the ACDM model. We plot the evolution trajectories of those models in the state...We apply two geometrical diagnostics, the statefinder {s, r} and Om（x）, to discriminate the Spatial Ricci scalar dark energy model from the ACDM model. We plot the evolution trajectories of those models in the statefinder plane and Om（x） plane. We show that the Spatial Ricci scalar dark energy model can be distinguished from the ACDM model at 68.3% confidence level for z ≤ 1.展开更多
基金supported by the 985-Ⅲ grant from Shanghai Jiao Tong Universitythe National Basic Research Program of China from Ministry of Science and Technology of China (Grant No.2010CB833005)+6 种基金the National Natural Science Foundation of China (Grant No.11055003)the Office of Science and Technology in Shanghai Municipal Government (Grant No.11DZ2260700)support from China Postdoctoral Science Foundation (Grant No.2014M551395)sponsored by Shandong UniversityPeking Universitythe University of Marylandthe University of Michigan
文摘We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days of exposure,no DM particle candidate event was found.This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results.The minimum upper limit,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.
基金supported in part by the National Natural Science Foundation of China (Grant No. 11147028)the Hebei Provincial Natural Science Foundation of China (Grant No. A2011201147)the Research Fund for Doctoral Programs of Hebei University (Grant No. 2009-155)
文摘We apply two geometrical diagnostics, the statefinder {s, r} and Om（x）, to discriminate the Spatial Ricci scalar dark energy model from the ACDM model. We plot the evolution trajectories of those models in the statefinder plane and Om（x） plane. We show that the Spatial Ricci scalar dark energy model can be distinguished from the ACDM model at 68.3% confidence level for z ≤ 1.
