1. Institute of Applied Mathematics, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, 100190 Beijing, China
2. Center for Theoretical Astrophysics and Cosmology, Institute for Computational Science, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
3. Dipartimento di Fisica ‘G. Occhialini’, Universitá degli Studi di Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
4. INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
5. Institute of Multidisciplinary Mathematics, Universitat Politècnica de València, 46022 València, Spain
6. DESY Zeuthen, 15738 Zeuthen, Germany
7. Kavli Institute for Astronomy and Astrophysics at Peking University, 100871 Beijing, China
8. Department of Astronomy, School of Physics, Peking University, 100871 Beijing, China