The work of IA was performed at the Steklov International Mathematical Center and supported by the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-15-2019-1614). AG is grateful to the CERN Theory Division and the Paris Observatory, LUTh for kind hospitality, where a part of this work was done. The work of IA and AG is supported by Russian Foundation for Basic Research (RFBR) grant No. 18-02-40069 mega. IA is also grateful for support provided “BASIS” Science Foundation (grant No. 18-1-1-80-4). AG is also supported by the JINR grant for young scientists No. 20-02-02 and the Landau-Heisenberg program. EG acknowledges support from CNRS 80 PRIME program TNENGRAV.