Academician Štefan Schwarz sexagenerian

Overlapping Schwarz

In Memory of Academician Er-Mi Zhao (1930-2016)

Academician Er-Mi Zhao, Professor of the Chengdu Institute of Biology, Chinese Academy of Sciences, and Sichuan University, passed away on 24 December, 2016, to the great loss of both Chinese and world herpetology. As one of the most internationally renowned Chinese herpetologists, Academician Zhao represented a remarkable era of Chinese herpetology and made a significant contribution to global...

Brief Survey of the Mathematical Legacy of Academician M. Kravchuk

This survey is devoted to the memory of the most outstanding mathematician in Ukraine, Academician Mykhailo Kravchuk. A brief summary on his life and mathematical legacy is provided. Mathematics Subject Classification: 01A70, 11-03, 15-03, 30D30, 33C45, 34A30, 60E05

Rotational Perturbations in Neveu-Schwarz–Neveu-Schwarz String Cosmology

First order rotational perturbations of the flat Friedmann-Robertson-Walker (FRW) metric are considered in the framework of four dimensional Neveu-Schwarz–Neveu-Schwarz (NS-NS) string cosmological models coupled with dilaton and axion fields. The decay rate of rotation depends mainly upon the dilaton field potential U . The equation for rotation imposes strong limitations upon the functional fo...

Anisotropic four-dimensional Neveu-Schwarz–Neveu-Schwarz string cosmology

An anisotropic ~Bianchi type I! cosmology is considered in the four-dimensional Neveu-Schwarz–NeveuSchwarz ~NS–NS! sector of low-energy effective string theory coupled to a dilaton and an axionlike H field within a de Sitter–Einstein frame background. The general solution of the gravitational field equations can be expressed in an exact parametric form in both Einstein and string frames. The st...