https://uniba.sk/ Najnovšie novinky sk https://uniba.sk/fileadmin/tt_news_article.gif https://uniba.sk/ Najnovšie novinky TYPO3 - get.content.right http://blogs.law.harvard.edu/tech/rss Thu, 31 Dec 2026 00:00:00 +0100 https://uniba.sk/ Thursday 9.6.2022 at 14:00 Lecture room C Denis Kochan (University of Regensburg & Institute of Physics, SAS Bratislava):
Anisotropic vortex squeezing in Rashba superconductors: a manifestation of Lifshitz invariants
Abstract:
Most 2D superconductors are of type II, i.e., they are penetrated by quantized vortices when exposed to out-of-plane magnetic fields. In a presence of a supercurrent, a Lorentz-like force acts on the vortices, leading to drift and dissipation. The current-induced vortex motion is impeded by pinning at defects. Usually, the pinning strength decreases upon any type of pair-breaking interaction that perturbs a system. In the talk, I will discuss surprising experimental evidence showing an unexpected enhancement of pinning in synthetic Rashba 2D superconductors when applying an in-plane magnetic field. When rotating the in-plane component of the field with respect to the driving current, the vortex inductance turns out to be highly anisotropic. We explain this phenomenon as a direct manifestation of the Lifshitz invariant that is allowed in the Ginzburg-Landau free energy by symmetry when space-inversion and time-reversal symmetries are broken. As demonstrated in our experiment [arXiv:2201.02512], elliptic squeezing of vortices---an inherent property of the non-centrosymmetric superconducting condensate--- provides access to fundamentally new property of Rashba superconductors, and offers an entirely novel approach to vortex manipulation. The talk is intended to be pedagogical and as pedestrian, as it can be. I will in introduce and motivate concepts of the Lifshitz invariants, the superconducting diode effect, and, generally, a notion of the non-centrosymmetric superconductivity. ]]> [FMFI] Prednášky a semináre [FMFI] Kalendár Frantisek.Herman@fmph.uniba.sk Mon, 30 May 2022 11:51:00 +0200 https://uniba.sk/ The Department of Nuclear Physics and Biophysics, Faculty of Mathematics, Physics, and Informatics,... June 20, 2022. The position will remain open until a suitable candidate is found.  The gross salary is around 27 375 per year (including social security contributions and taxes).  Contact: Fedor Šimkovic (fedor.simkovic@fmph.uniba.sk)
Letters of reference should be sent to: fedor.simkovic@fmph.uniba.sk]]> [FMFI] Postdoktorandské pozície [FMFI] Kalendár [FMFI] Titulka - široké novinky Fedor.Simkovic@fmph.uniba.sk Fri, 27 May 2022 08:53:00 +0200 https://uniba.sk/ Wednesday 1.6.2022 at 14:00, Lecture room F1/111 Mgr. Adam Broniš:
Electron capture decay in the transfermium region – studies of 253No, 254No and 254Md

Abstract:
All so far synthesized heavy or super-heavy nuclei are neutron deficient due to the mechanism of their production - fusion-evaporation reactions. Two decay modes - β+ or electron capture (EC) decay are available where the latter is usually favored due to its larger Q value. With its Q values ranging up to several MeV, the EC decay can provide crucial information on the Nilsson configurations and energies of the states populated in the daughter nuclei, which cannot be accessed otherwise (e.g., via α decay). The excitation energies of multi-quasiparticle states can be used to estimate the influence of the nucleon-nucleon interaction. However, until now, the study of EC decay in the transfermium region was represented by only a few cases - 253Md, 257Rf, 258Db, 255Md, and 256Md. The first part of the talk will be dedicated to the previous results of the EC decay investigations in the transfermium region and the method for the production of heavy isotopes. In addition, the experimental setup and the detection technique based on the registration of the coincidences between characteristic X rays and conversion electrons (CE) will be introduced. In the second part of the talk, the results of the 253No, 254No, and 254Md EC decay study will be presented. These results were based on the data sets obtained in the four experiments performed at the velocity filter SHIP in GSI Darmstadt. The tentative decay schemes of the high-energy excited states in 253Md, 254Md, and 254Fm populated via EC decay will be proposed. In addition, their tentative Nilsson configurations based on the theoretical predictions will be discussed. Interestingly, an intense feeding of the high-energy states in 254Fm via EC decay of 254Md was observed, in contrast with the predicted population of the low-spin and low-energy states.]]> [FMFI] Prednášky a semináre [FMFI] Kalendár Jaroslav.Stanicek@fmph.uniba.sk Thu, 26 May 2022 11:21:00 +0200 https://uniba.sk/ Tuesday 31.5.2022 at 14:00 and 14:30, Lecture room F2 125 Peter Čišovský:
Cosmological perturbations in universe with dark energy 31.5.2022 at 14:00 hod., Lecture room F2/125 Abstract:
Dark energy with pressure to energy density ratio $w=-1$, or close to $-1$, is an essential component of our universe, but its nature is still a matter of research. When cosmological perturbations are studied, perturbations of all components in the universe must be considered. However, it turns out that if the dark energy is described as a perfect fluid, then perturbations in it cannot be formed. Dark energy perturbations are then usually omitted. A prominent exception is cosmological inflation in which expansion of the universe is driven by matter with pressure to energy density ratio w not equal to but close to $-1$. Violation of the condition $w=-1$ is needed to avoid eternal inflation, and also leads to perturbations of the matter driving it. The goal is to study cosmological perturbations in models slightly different from the model with ideal fluid with $w=-1$, such as model with shear stress, or models combining simpler ones.
Vladimír Kráľovič
Infrared finiteness of the NLO corrections to leptogenesis 31.5.2022 at 14:30, Lecture room F2/125 Abstract:
Infrared divergences appear in quantum theories involving massless particles and complicate evaluation of the reaction rates. Therefore, it is crucial to somehow remove these divergences from our calculations. In this thesis we explore how we can use the S-matrix unitarity constraints for the cancelation of infrared divergences. Then we will use this approach to evaluate some reaction rates for the type-I seesaw model. This model involves only one type of massive particles at the relevant energetic scale (the right-handed Majorana neutrinos) and all standard model particles are considered massless.]]> [FMFI] Prednášky a semináre [FMFI] Kalendár Peter.Matak@fmph.uniba.sk Thu, 26 May 2022 10:47:00 +0200 https://uniba.sk/ A study on fluid flow and phase change dynamics in multicomponent systems has been published in the... https://doi.org/10.1063/PT.3.4940 ]]> [FMFI] Veda [FMFI] Titulka - úzke novinky Peter.Guba@fmph.uniba.sk Mon, 23 May 2022 12:29:00 +0200 https://uniba.sk/ Bratislava, 23 May 2022: During the two weeks while their more senior schoolmates graduate, high... "We are happy to open the academia even to those high school students who are still some years away from having to decide about their future education. I am pleased that after two years online we will meet them again in person in our Auditorium. I also hope that the lecture day will awaken a fascination in them and that we will soon see them back as students of bachelor studies," said the Rector of Comenius University Marek Števček. Event agenda]]> [RUK] Titulka - úzke novinky [RUK] Tlačové správy [RUK] Tlačové správy EN pr@uniba.sk Fri, 27 May 2022 15:14:00 +0200 http://https://www.fedu.uniba.sk/en/faculty-structure/ Departments, Institutes [PdF] Titulka - úzke novinky [PdF] EN Titulka - úzke novinky Mon, 23 May 2022 08:41:00 +0200 https://uniba.sk/ 2 June, between 10:00 a.m and noon at FSES, Mlynské luhy 4, Bratislava [RUK] Kalendár pr@uniba.sk Fri, 20 May 2022 14:34:00 +0200 https://uniba.sk/ Bratislava, 20 May 2022: In the 2022 Round University Ranking Comenius University Bratislava was... [RUK] Titulka - úzke novinky [RUK] Tlačové správy [RUK] Tlačové správy EN pr@uniba.sk Mon, 23 May 2022 16:22:00 +0200 https://uniba.sk/ Two candidates, Andrea Čalkovská and Branislav Kolarovszki, stood as candidates in the election of... [RUK] Titulka - široké novinky pr@uniba.sk Mon, 23 May 2022 16:17:00 +0200