Search academic texts

Information × Registration Number 0223U001654, 0122U001865 , R & D reports Title Relativistic gravity, dark matter and dark energy in extragalactic and cosmological objects popup.stage_title Head Parnovskyi Serhii L., Доктор фізико-математичних наук Registration Date 01-02-2023 Organization Taras Shevchenko National University of Kyiv popup.description2 Research object: early universe, relativistic astrophysical objects, space-time near singularities. gravitational radiation, extragalactic gravitational lensing systems, galaxies. The goal of the work: the search for the effects of "New Physics" and the analysis of observations of extragalactic objects, including data from gravitationalwave astronomy. In particular, the ways of finding out the nature of DE and DM, searching for possible effects in astrophysical and cosmological processes involving scalar fields or obtaining restrictions on them. Development of theoretical base for testing and/or modification of the basic foundations of the relativistic theory of gravity. Research methods: methods of theoretical physics and astrophysics, mathematical statistics and regression analysis, numerical modelling. Constraints on the parameters of alternative gravitational theories have been obtained based on cosmological observations. In particular, a database of restrictions on the content and parameters of primordial black holes was created. A numerical model has been developed for the generation of flares or explosions from the last seconds of the existence of a population of primordial black holes, which will be used to estimate the sensitivity of the Cherenkov Telescope Array to such flares. The effects of asymmetry of the radiation source on the light curves during microlensing were calculated. The parameters of the variability of the light curves, necessary for determining the delay time between X-ray images in the Q2237+0305 system were estimated. A search was made for local compact galaxies with active star formation in which hot dust emission was detected according to data from the WISE space mission, and a list of such galaxies was created on this basis. The cosmological and astrophysical manifestations of F(R) gravity as an inflationary theory and as a dark matter candidate are considered. Product Description popup.authors Izotova Iryna Yu. Zhdanov Valery I. Sergijenko Olga M. Stashko Oleksandr S. Shtаnov Yurii V. popup.nrat_date 2023-02-01 Close