The work of G.A. is supported by the German Science Foundation (DFG) under the Collaborative Research Center (SFB) 676 Particles, Strings and the Early Universe. The work of B.H. is partially supported by Grant No. 615203 from the European Research Council under the FP7. The work of R.R. is supported in part by the US Department of Energy under DOE Grant No. de-sc0013699. The work of A.A.T. is supported by the ERC Advanced Grant No. 290456, the STFC Grant ST/J0003533/1 and by the Russian Science Foundation Grant 14-42-00047 associated with Lebedev Institute.
Received: 30.11.2015 Accepted: 21.12.2015
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