Ground-state multiquantum vortices in rotating two-species superfluids

We show numerically that a rotating, harmonically trapped mixture of two Bose-Einstein-condensed superfluids can, contrary to its single-species counterpart, contain a multiply quantized vortex in the ground state of the system. This giant vortex can occur without any accompanying single-quantum vortices, may either be coreless or have an empty core, and can be realized in a $^{87}$Rb-$^{41}$K Bose-Einstein condensate. Our results not only provide a rare example of a stable, solitary multiquantum vortex but also reveal exotic physics stemming from the coexistence of multiple, compositionally distinct condensates in one system.Comment: 6 pages, 4 color figures; identical in content to the published articl

Skyrmionic vortex lattices in coherently coupled three-component Bose-Einstein condensates

We show numerically that a harmonically trapped and coherently Rabi-coupled three-component Bose-Einstein condensate can host unconventional vortex lattices in its rotating ground state. The discovered lattices incorporate square and zig-zag patterns, vortex dimers and chains, and doubly quantized vortices, and they can be quantitatively classified in terms of a skyrmionic topological index, which takes into account the multicomponent nature of the system. The exotic ground-state lattices arise due to the intricate interplay of the repulsive density-density interactions and the Rabi couplings as well as the ubiquitous phase frustration between the components. In the frustrated state, domain walls in the relative phases can persist between some components even at strong Rabi coupling, while vanishing between others. Consequently, in this limit the three-component condensate effectively approaches a two-component condensate with only density-density interactions. At intermediate Rabi coupling strengths, however, we face unique vortex physics that occurs neither in the two-component counterpart nor in the purely density-density-coupled three-component system.Comment: 13 pages, 16 color figures; v2 is identical in content to the published articl

Threats of economic safety

In the given report classification of dangers and threats to interests in economic sphere for the purpose of an estimation of their intensity and the organisation of actions for counteraction are considered by ityesBelgorod State Universit

Structure of system of budgetary-tax safety of region

Article is devoted theoretical aspects of budgetary-tax safety. Features of its formation in a cut of maintenance of economic safety and budgetary and tax the politician are considered. Also in article factors of the budgetary-tax safety are concretised and reflected, allowing to spend more effective budgetary management of regionyesBelgorod State Universit

“Foreign Agents,” Sovereignty, and Political Pluralism: How the Russian Foreign Agents Law is Shaping Civil Society

During the 1990s, many Russian non-governmental organizations (“NGOs”) secured foreign funding and participated in transnational advocacy networks. However, in the early 2000s, Russian authorities attempted to regain control over foreign-funded NGOs’ activities, presenting these NGOs as national security threats. The 2012 Russian Foreign Agents Law and the resulting 2018 challenge before the European Court of Human Rights reflect contemporary Russian political rhetoric that views Western governments and their agents, including NGOs, as threats to Russian sovereignty and national security. However, legal challenges also de-politicize the issues by forcing all parties into the framework of legal argument, reflecting the decline of political pluralism in Russia. Revitalizing Russia’s civil and political landscapes requires a thorough redefinition of national security, one that includes NGOs participating in transnational advocacy networks as partners in providing security

Pluralism, Democracy, and the Conflict Within: Challenging the State’s Narrative by Artistic Forms of Protest

This article follows the Pussy Riot case from the 2012 trial decision to the 2018 challenge before the European Court of Human Rights (ECtHR). The case revolved around the “punk prayer” performed by three women in Christ the Saviour Cathedral in Moscow. While the case, which centered on violation of freedom of expression, may be framed as a matter of political speech vs. religious speech, it has broader implications. Pussy Riot’s performance and subsequent legal cases were about the ability of pluralism and dissent to counter the carefully constructed government narrative of “traditional values” and moral sovereignty. For democracy to develop and endure, pluralism must continually challenge existing power relationships and expose inequality. Thus, accountability is key when it comes to pluralism in the public realm. However, constant accountability is unimaginable without freedom of expression and the voicing of dissenting opinions. Thus, in order to live up to its constitutional commitment to pluralism, it is key for Russia to develop a safe space for public discussion pertaining to government, governmental representatives and broader public policy issues, despite the conflicts that such discussion will generate. Artistic forms of protest alone, such as the one engaged in by Pussy Riot, are not enough, as they currently fail to appeal and be accessible to larger Russian audiences