Magnetic black universes and wormholes with a phantom scalar

We construct explicit examples of globally regular static, spherically symmetric solutions in general relativity with scalar and electromagnetic fields which describe traversable wormholes (with flat and AdS asymptotics) and regular black holes, in particular, black universes. A black universe is a nonsingular black hole where, beyond the horizon, instead of a singularity, there is an expanding, asymptotically isotropic universe. The scalar field in these solutions is phantom (i.e., its kinetic energy is negative), minimally coupled to gravity and has a nonzero self-interaction potential. The configurations obtained are quite diverse and contain different numbers of Killing horizons, from zero to four. This substantially widens the list of known structures of regular black hole configurations. Such models can be of interest both as descriptions of local objects (black holes and wormholes) and as a basis for building nonsingular cosmological scenarios.Comment: 13 pages, 6 figure

Foreign lobbying as an instrument of defense cooperation between Poland and the United States

Defence cooperation between Poland and the United States significantly affects the security agenda of Russia, the Baltic region, and Europe as a whole. On the one hand, Poland intends to become a key partner of the US in ensuring European security. On the other hand, it has ambitions to take the leading position in the security area among the Baltic States. The Polish leadership sees an additional advantage in expanding military cooperation with the United States, regarding it as a jumping board to accelerating its economic and technological development. This article examines a mechanism underlying defence cooperation between the US and Poland, i.e. lobbying Poland’s interests in another state. This allows Warsaw to actively promote its interests in the US. The research methodology employed includes the periodisation of Polish lobbying activities in the US and an empirical study of lobbying based on analysis of original documents, many of which have been analysed for the first time. It is shown that, under the existing party system, Poland will not abandon strategic partnership with the United States, primarily in security and defence. Over the study period, Poland quickly gained experience in promoting its interests in the US through direct lobbying, showing flexibility in negotiations, relying on the two-party support in the US Congress, successfully coordinating the activities of its governing bodies and various corporations which are submitted to tight state control