6 [28] A. Boyarsky, O. Ruchayskiy, and M. Shaposhnikov, Ann. Rev. Nucl. Part. Sci. 59 , 191 (2009), and references therein. [29] J. Chang, et al. , [ATIC Collaboration], Nature 456 , 362 (2008). [30] S. Torii, et al. , [PPB-BETS Collaboration], arXiv: 0809.0760 [astro-ph]. [31] O. Adriani, et al. , [PAMELA Collaboration], Nature 458 , 607 (2009). [32] F. Aharonian et al. , [H.E.S.S. Collaboration], Astron. As- trophys. 508: , 561 (2009). [33] A.A. Abdo, et al. , [Fermi/LAT Collaboration], Phys. Rev. Lett. 102 , 181101 (2009). [34] S. Profumo, arXiv:0812.4457 [astro-ph]. [35] V. Barger, Y. Gao, W.Y. Keung, D. Marfatia, and G. Shaughnessy, Phys. Lett. B 678 , 283 (2009). [27] P. Jean et al. , Astron. Astrophys. 407 , L55 (2003). [26] C. Picciotto and M. Pospelov, Phys. Lett. B 605 , 15 (2005); S. Khalil and O. Seto, JCAP 0810 , 024 (2008). [25] F. Bezrukov, H. Hettmansperger, and M. Lindner, arXiv:0912.4415 [hep-ph]. [24] P.B. Pal and L. Wolfenstein, Phys. Rev. D 25 , 766 (1982); V. Barger, R.J.N. Phillips, and S. Sarkar, Phys. Lett. B 352 , 365 (1995). [23] W.B. Lin, D.H. Huang, X. Zhang, and R.H. Branden- berger, Phys. Rev. Lett. 86 , 954 (2001). [22] V.A. Kuzmin, V.A. Rubakov, and M.E. Shaposhnikov, Phys. Lett. B 191 , 171 (1987); M. Shaposhnikov, Nucl. Phys. B 308 , 885 (1988). [21] V.A. Kuzmin, V.A. Rubakov, and M.E. Shaposhnikov, Phys. Lett. B 155 , 36 (1985). [20] Z. Maki, M. Nakagawa, and S. Sakata, Prog. Theor. Phys. 28 , 870 (1962).