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38 papers · 1 filter
The Tianlai project: a 21cm cosmology experiment
Xuelei Chen
In my talk at the 2nd Galileo-Xu Meeting, I presented several different topics in 21cm cosmology for which I have done research. These includes the 21cm signature of the first star…
A Metal-Strong and Dust-Rich Damped \lya Absorption System toward the Quasar SDSS J115705.52+615521.7
Jian-Guo Wang, Hong-Yan Zhou, Jian Ge +7
(Abridged for arXiv) We report the discovery of an unusual, extremely dust-rich and metal-strong damped \lya absorption system (DLA) at a redshift toward the quasar…
Comparative study between N-body and Fokker-Planck simulations for rotating star clusters - II. 2-component models
Jongsuk Hong, Eunhyeuk Kim, Hyung Mok Lee +1
To understand the effects of the initial rotation on the evolution of the tidally limited clusters with mass spectrum, we have performed N-body simulations of the clusters with dif…
Observational constraints on cosmic neutrinos and dark energy revisited
Xin Wang, Xiao-Lei Meng, Tong-Jie Zhang +5
Using several cosmological observations, i.e. the cosmic microwave background anisotropies (WMAP), the weak gravitational lensing (CFHTLS), the measurements of baryon acoustic osci…
Sound-speed inversion of the Sun using a nonlocal statistical convection theory
Chunguang Zhang, Licai Deng, Darun Xiong +1
Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of solar convection zone. We demonstrate that thi…
The Mid-term and Long-term Solar Quasi-periodic Cycles and the Possible Relationship with Planetary Motions
Baolin Tan, Zhuo Cheng
This work investigates the solar quasi-periodic cycles with multi-timescales and the possible relationships with planetary motions. The solar cycles are derived from long-term obse…