Quantum Monte Carlo many-body methods: introduction and recent progress

seminar by prof. Lubos Mitas / North Carolina State University July 15, 2019 at 10:30 in SA1A1 (P1) lecture hall, Institute of Physics, Park Angelinum 9, Košice I will present a short introduction into the electronic structure quantum Monte Carlo (QMC) based on sampling of particles coordinates. These methods typically employ fixed-node approximations to deal with the fermion signs. I will show  examples of current…

Renormalization group analysis of stochastic and turbulent systems

In our works we apply quantum field methods developed initially to describe interactions between elementary particles to the problems of statistical physics, namely to the fully developed hydrodynamic turbulence. The general feature of such models of statistical physics like critical behaviour and turbulence is presence of strong fluctuations, and, therefore, the presence of divergences in perturbation theory and absence of small perturbation parameter. In this…

AG Draconis, a mystery older than the Republic

Interacting variable stars, to which symbiotic binary stars belong, are  among the most exciting objects that a variety of variable stars offer. Physical mechanisms related to transfer and accretion of matter cause observable activity by manifesting increases of brightness (about 2 – 5 mag) and significant changes in the spectra of these objects. The brightenings of symbiotic systems have been recorded since the early 20th…