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Information × Registration Number 0219U000029, 0118U005385 , R & D reports Title Determination of dark matter properties by using astrophysical and cosmological observations popup.stage_title Head Iakubovskyi Dmytro Anatoliovych, Registration Date 09-01-2019 Organization Bogolyubov Institute of Theoretical Physics NAS of Ukraine popup.description2 1. Dark matter line candidate on 3.5 keV was detected in the regions further away from Galactic center than in previous works. Obtained surface brightness profile is not consistent with nearest astrophysical lines, the intensity decreases slower with the distance from GC. Obtained profile consistent with previous detections in NuSTAR and Chandra blank sky data. This result prefers the line origin which don't originate from the atomic transitions. 2. We use the semi-analytical "bubble" model, previously modified by authors, to model the reionization. For the sterile neutrinos with 7 keV mass (twice the energy of the previously described line) we show that the observational data can be described slightly better than in standard CDM (delta chi-squared statistics near 2-3). 3. We build the constraint on the mass of light fermionic dark matter using the dwarf spheroidals kinematics data. To construct the dark matter halo profile we use our previously developed semi-analytical algorithm. We show that the dark matter models with particle mass lower than 0.2keV are disfavoured. 4. To analyze the influence of the warm dark matter on the cosmological absorption profile detected by EDGES experiment in the 75-80 MHz range we modify and use the ARES software package. We show that the alternative dark matter models (such as warm dark matter or sterile neutrino, probably responsible for detected 3.5 keV signal) describe the data as good as the standard cosmological model. Product Description popup.authors Добричева Дар'я Вікторівна Рудаковський Антон Володимирович Савченко Денис Олександрович Ціж Максим Богданович Якубовський Дмитро Анатолійович popup.nrat_date 2020-04-02 Close