Hungary Higher Education Quality Assurance System

Higher education quality assurance system has drawn much attention since 1980s. Most countries are committed to build the higher education quality assurance system to meet international standards. Under such an international trend, Hungary also actively promotes higher education reform, and established Hungarian Accreditation Committee and in order to ensure the quality of higher education

Probing new physics with polarized τ\tau and Λc\Lambda_c in quasielastic ντ ⁣+ ⁣n ⁣→ ⁣τ− ⁣+ ⁣Λc\nu_{\tau}\!+\!n\!\to\! \tau^-\!+\!\Lambda_c scattering process

The absence of semitauonic decays of charmed hadrons makes the decay processes mediated by the quark-level $c\to d \tau^+ \nu_{\tau}$ transition inadequate for probing a generic new physics (NP) with all kinds of Dirac structures. To fill in this gap, we consider in this paper the quasielastic neutrino scattering process $\nu_{\tau}+n\to \tau^-+\Lambda_c$, and propose searching for NP through the polarizations of the $\tau$ lepton and the $\Lambda_c$ baryon. In the framework of a general low-energy effective Lagrangian, we perform a comprehensive analysis of the (differential) cross sections and polarization vectors of the process both within the Standard Model and in various NP scenarios, and scrutinize possible NP signals. We also explore the influence on our findings due to the uncertainties and the different parametrizations of the $\Lambda_c \to N$ transition form factors, and show that they have become one of the major challenges to further constrain possible NP through the quasielastic scattering process.Comment: 31 pages, 17 figures, and 3 tables. Comments are welcom

Подходы к лечению перфорантной недостаточности у пациентов с варикозной болезнью вен нижних конечностей

ВАРИКОЗНОЕ РАСШИРЕНИЕ ВЕНКОНЕЧНОСТЬ НИЖНЯЯХИРУРГИЧЕСКИЕ ОПЕРАЦИИперфорантная недостаточност

Non-Hermitian guided modes and exceptional points using loss-free negative-index materials

We analyze the guided modes in coupled waveguides made of negative-index materials without gain or loss. We show that it supports non-Hermitian phenomenon on the existence of guided mode versus geometric parameters of the structure. The non-Hermitian effect is different from parity-time (PT) symmetry, and can be explained by a simple coupled-mode theory with an anti-PT symmetry. The existence of exceptional points and slow-light effect are discussed. This work highlights the potential of loss-free negative-index materials in the study of non-Hermitian optics

Higher-order exceptional points in loss-free waveguide arrays with negative-index materials

Negative-index materials (NIMs) are shown to support optical anti-parity-time (anti-PT) symmetry even when they are lossless. Here we prove the feasibility in achieving higher-order exceptional points (EPs) in loss-free waveguide arrays by utilizing the anti-$\mathcal{PT}$ symmetry induced by NIM. Numerical simulation about a third-order EP fits well with the coupled-mode theory. A scheme of achieving fourth-order EPs is also discussed. This work highlights the potential of loss-free NIMs in the study of non-Hermitian optics

QCD preheating: New frontier of baryogenesis

We find that QCD can create the cosmological matter abundance via out-of-equilibrium processes during the QCD phase transition, that is what we call the QCD preheating, where the dynamic transition of the QCD vacuum characterized by the quark condensate takes place instantaneously. This mechanism works when the Universe undergoes subsequent supercooled QCD transition. We also find that the QCD preheating can work to create the baryon asymmetry of the Universe if there is the new physics communicated with QCD. These are new pictures of the thermal history around the QCD-phase transition epoch, and thus the dynamic aspect of the QCD vacuum opens a new frontier to explore low-scale matter generation such as baryogenesis. Pursuing the QCD reheating era would also help deeply understanding the subatomic-scale physics in the thermal history of the Universe.Comment: 12 pages, 3 figures; setups for QCD preheating refined; a version accepted in Phys.Rev.