Персона: Шлепкина, Екатерина Сергеевна
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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- ПубликацияТолько метаданныеIndirect effects of dark matter(2019) Belotsky, K. M.; Esipova, E. A.; Kamaletdinov, A. K.; Shlepkina, E. S.; Solovyov, M. L.; Белоцкий, Константин Михайлович; Есипова, Екатерина Александровна; Шлепкина, Екатерина Сергеевна; Соловьев, Максим Леонидович© 2019 World Scientific Publishing Company.Here, we briefly review possible indirect effects of dark matter (DM) of the universe. It includes effects in cosmic rays (CR): first of all, the positron excess at ~500GeV and possible electron-positron excess at 1-1.5TeV. We tell that the main and least model-dependent constraint on such possible interpretation of CR effects goes from gamma-ray background. Even ordinary e+e- mode of DM decay or annihilation produces prompt photons (FSR) so much that it leads to contradiction with data on cosmic gamma-rays. We present our attempts to possibly avoid gamma-ray constraint. They concern with peculiarities of both space distribution of DM and their physics. The latter involves complications of decay/annihilation modes of DM, modifications of Lagrangian of DM-ordinary matter interaction and inclusion of mode with identical fermions in final state. In this way, no possibilities to suppress were found except, possibly, the mode with identical fermions. While the case of spatial distribution variation allows achieving consistency between different data. Also, we consider stable form of DM which can interact with baryons. We show which constraint such DM candidate can get from the damping effect in plasma during large-scale structure (LSS) formation in comparison with other existing constraints.
- ПубликацияТолько метаданныеВОЗМОЖНЫЕ ЭФФЕКТЫ В КОСМИЧЕСКОМ ГАММА-ИЗЛУЧЕНИИ ОТ РАСПАДА ИЛИ АННИГИЛЯЦИИ ЧАСТИЦ СКРЫТОЙ МАССЫ(2021) Шлепкина, Е. С.; Шлепкина, Екатерина Сергеевна; Белоцкий К.М.
- ПубликацияОткрытый доступCosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter(2020) Belotsky, K. M.; Kamaletdinov, A. K.; Shlepkina, E. S.; Solovyov, M. L.; Белоцкий, Константин Михайлович; Шлепкина, Екатерина Сергеевна; Соловьев, Максим ЛеонидовичThe observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed.
- ПубликацияОткрытый доступTheoretical Indication of a Possible Asymmetry in Gamma-Radiation Between Andromeda Halo Hemispheres Due to Compton Scattering on Electrons From Their Hypothetical Sources in the Halo(2020) Belotskiy, K. М.; Shlepkina, E. S.; Solovyov, M. L.; Белоцкий, Константин Михайлович; Шлепкина, Екатерина Сергеевна; Соловьев, Максим Леонидович
- ПубликацияОткрытый доступProposition of FSR Photon Suppression Employing a Two-Positron Decay Dark Matter Model to Explain Positron Anomaly in Cosmic Rays(2023) Barak, R.; Belotskiy, K.; Shlepkina, E. S.; Белоцкий, Константин Михайлович; Шлепкина, Екатерина СергеевнаThe origin of an anomalous excess of high-energy (about 100 GeV and higher) positrons in cosmic rays is one of the rare problems in this field, which is proposed to be solved with dark matter (DM). Attempts to solve this problem are faced with the issue of having to satisfy the data on cosmic positrons and cosmic gamma radiation, which inevitably accompanies positron production, such as FSR (final state radiation), simultaneously. We have been trying to come up with a solution by means of two approaches: making assumptions (*) about the spatial distribution of the dark matter and (**) about the physics of its interactions. This work is some small final step of a big investigation regarding the search for gamma suppression by employing the second approach, and a model with a doubly charged particle decaying into two positrons (X++ $\rightarrow$ e+ e+) is suggested as the most prospective one from those considered before.
- ПубликацияОткрытый доступAnalysis of programming tools in framework of dark matter physics and concept of new MC-generator(2019) Belotsky, K.; Kamaletdinov, A. H.; Shlepkina, E. S.; Белоцкий, Константин Михайлович; Шлепкина, Екатерина Сергеевна© 2019 DMFA zaloznistvo. All rights reserved.We analyse here some programming tools (MC-generators) from viewpoint of their application to the tasks of dark matter (DM) interpretation of cosmic rays puzzles. We shortly describe our tasks, where the main goal is the solution of the problem of suppression of gamma-rays induced by the products of DM decay or annihilation in Galaxy. We show that existing MC-generators do not fully satisfy our task, comparing them, and suggest our own one.