Dialogue, Independence, and Unity: Toward a Moral Solution to Political Problems between Russia and Ukraine

The real war continues in the center of Europe, between two so-called Christian nations. By this, I mean the war between Russia and Ukraine, which threatens to escalate into a larger, global conflict. Christians around the world appeal to the value of dialogue, urging all sides involved to come to peace. But what does it mean? And how do we reconcile those who value independence with those who appreciate a forced unity? It is important to reflect on these difficult theological and moral dilemmas

Protestants and the Ukrainian Greek Catholic Church: In Search of Inclusive Solutions

Post-Soviet Protestants, having gotten used to living in coexistence with an atheistic society over the course of 70 years, have discovered something new in the years since Ukraine gained independence—Orthodox tradition. It did not happen at once, but the first attempts have been made at reclassifying the relationship between Protestants and Orthodox as other, not foreign. However, the Orthodox other is not the only other. In dialogue with the official Orthodox Church, it is easy to lose sight of the diversity within Orthodoxy (Orthodox churches are “other” to each other), and also the coexistence in the same cultural arena of Catholic and Greek Catholic churches. The disunity of the Orthodox Church and its internal diversity should be especially interesting to Protestants, because it creates the opportunity for a confessional census. Put simply, when there are multiple “others,” then there is room for the Protestants as well. Diversity is a fact, which, when considered, sheds light on precedents and also rights

Studies of the nature of the low-energy, gamma-like background for Cherenkov Telescope Array

The upcoming Cherenkov Telescope Array (CTA) project is expected to provide unprecedented sensitivity in the low-energy ( <~100 GeV) range for Cherenkov telescopes. In order to exploit fully the potential of the telescopes the standard analysis methods for gamma/hadron separation might need to be revised. We study the composition of the background by identifying events composed mostly of a single electromagnetic subcascade or double subcascade from a {\pi}0 (or another neutral meson) decay. We apply the standard simulation and analysis chain of CTA to evaluate the potential of the standard analysis to reject such events.Comment: All CTA contributions at arXiv:1709.03483. Proc. of the 35th International Cosmic Ray Conference, Busan, Kore

Superfluid Motion of Light

Superfluidity, the ability of a fluid to move without dissipation, is one of the most spectacular manifestations of the quantum nature of matter. We explore here the possibility of superfluid motion of light. Controlling the speed of a light packet with respect to a defect, we demonstrate the presence of superfluidity and, above a critical velocity, its breakdown through the onset of a dissipative phase. We describe a possible experimental realization based on the transverse motion through an array of waveguides. These results open new perspectives in transport optimization.Comment: 4 pages, 3 figure

A possible use for polarizers in imaging atmospheric Cherenkov telescopes

Cherenkov radiation produced in Extensive Air Showers shows a net polarization. This article discusses its properties and physical origin, and proposes an arrangement of polarizers potentially useful for Imaging Atmospheric Cherenkov Telescopes.Comment: 30 pages, 13 figures. Accepted for publication in Astroparticle Physic

Quantum Spectrum of Cherenkov Glue

Full quantum calculation of Cherenkov gluon radiation by quark and gluon currents and a Cherenkov decay of a gluon into a pair of Cherenkov gluons in transparent media is performed. Energy losses due to Cherenkov gluon radiation in high energy nuclear collisions are calculated. The angular distribution of the energy flow due to the radiation of Cherenkov gluons is analyzed.Comment: 10 pages, 9 figures, misprints and references corrected, version accepted to Nuclear Physics