Search academic texts

Information × Registration Number 0222U001783, 0120U104854 , R & D reports Title Light dark matter and dynamical dark energy in the Universe popup.stage_title Head Shtanov Yurii V., Доктор фізико-математичних наук Registration Date 03-02-2022 Organization М.М.Bogolyubov Institute of Theoretical Physics of the National Academy of Sciences of Ukraine popup.description2  Artefacts connected with discretization of the regular velocity field in N-body cosmological simulations of warm dark matter are calculated. The values of the mass of a particle of fuzzy dark matter were found, which are preferred from the data of the kinematics of disk galaxies from the SPARC database. The sensitivity of the X-ray mission Einstein probe, scheduled for the end of 2022, to the detection of possible signals of the decay of dark matter in the nuMSM model was estimated. Numerical solutions of Einstein`s equations with a scalar field with an indefinite potential of self-interacion and with a fermionic field are obtained and investigated, and distribution of stable circular orbits and the images of accretion disk are constructed for these solutions. A new type of singularities arising in spherically symmetric solutions of Einstein’s equations in the presence of a strongly nonlinear scalar field that grows faster than any exponent is studied. Constraints on the initial power spectra of cosmological perturbations at small wave numbers are obtained, which eliminate the contradiction between different observational determinations of the Hubble constant. Classification is given of solutions for homogeneous anisotropic cosmology with different possibilities of transition from expansion to compression and isotropization. A list of all possible types of singularities in the future for the Bianchi type I model is provided. Product Description popup.authors Zhdanov Valerii I. Parnovsky Sergei L. Rudakovskyi Anton V. Savchenko Denys O. Stashko Oleksandr S. Khelashvili Mariia V. Shtаnov Yurii V. popup.nrat_date 2022-03-09 Close