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Стасенко, Виктор Дмитриевич

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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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Стасенко

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Виктор Дмитриевич

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Теперь показываю 1 - 9 из 9

Только метаданные
Динамическая эволюция скопления первичных черных дыр
(2021) Стасенко, В. Д.; Стасенко, Виктор Дмитриевич; Кириллов Александр Александрович
Только метаданные
МОДЕЛИРОВАНИЕ БЕЗНЕЙТРИННОГО ДВОЙНОГО ПОЗИТРОННОГО БЕТА- РАСПАДА 124Xe В РАБОЧЕМ ВЕЩЕСТВЕ ДЕТЕКТОРА РЭД-100
(2020) Стасенко, В. Д.; Стасенко, Виктор Дмитриевич; А.В. Этенко
Только метаданные
Dynamics and Merger Rate of Primordial Black Holes in a Cluster
(2022) Stasenko, V. D.; Kirillov, A. A.; Belotskiy, K. M.; Стасенко, Виктор Дмитриевич; Кириллов, Александр Александрович; Белоцкий, Константин Михайлович
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.The PBH clusters can be sources of gravitational waves, and the merger rate depends on the spatial distribution of PBHs in the cluster which changes over time. It is well known that gravitational collisional systems experience the core collapse that leads to significant increase of the central density and shrinking of the core. After core collapse, the cluster expands almost self-similarly (i.e., density profile extends in size without changing its shape). These dynamic processes affect the merger rate of PBHs. In this paper, the dynamics of the PBH cluster is considered using the Fokker–Planck equation. We calculate the merger rate of PBHs on cosmic time scales and show that its time dependence has a unique signature. Namely, it grows by about an order of magnitude at the moment of core collapse which depends on the characteristics of the cluster, and then decreases according to the dependence R ∝ t−1.48 . It was obtained for monochromatic and power-law PBH mass distributions with some fixed parameters. Obtained results can be used to test the model of the PBH clusters via observation of gravitational waves at high redshift.
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Redshift evolution of primordial black hole merger rate
(2024) Stasenko, V. D.; Стасенко, Виктор Дмитриевич
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Evolution of the cluster of primordial black holes within the Fokker-Planck approach
(2020) Stasenko, V. D.; Kirillov, A. A.; Стасенко, Виктор Дмитриевич; Кириллов, Александр Александрович
© Published under licence by IOP Publishing Ltd.The calculation results of the evolution of the cluster of primordial black holes based on the Fokker-Planck equation with neglecting of the gas accretion onto black holes are presented. In addition, we consider how a massive black hole located within the cluster center affects on its evolution. Despite it creates an additional potential in the central region of the cluster and might capture surrounding black holes, a negligible growth rate of a central black hole was shown for 1 Gyr. Furthermore, we find a significant (approximately tenfold) expansion of the cluster.
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The Merger Rate of Black Holes in a Primordial Black Hole Cluster
(2021) Stasenko, V. D.; Kirillov, A. A.; Стасенко, Виктор Дмитриевич; Кириллов, Александр Александрович
In this paper, the merger rate of black holes in a cluster of primordial black holes (PBHs) is investigated. The clusters have characteristics close to those of typical globular star clusters. A cluster that has a wide mass spectrum ranging from 10(-2) to 10M(circle dot) (Solar mass) and contains a massive central black hole of the mass M-center dot=10(3) M-circle dot is considered. It is shown that in the process of the evolution of cluster, the merger rate changed significantly, and by now, the PBH clusters have passed the stage of active merging of the black holes inside them.
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Structure of the Baryon Halo Around a Supermassive Primordial Black Hole
(2024) Murygin, B.; Stasenko, V. ..; Eroshenko, Y.; Мурыгин, Борис Сергеевич; Стасенко, Виктор Дмитриевич
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Influence of early dark matter haloes on the primordial black holes merger rate
(2023) Stasenko, V.; Belotskiy, K.; Стасенко, Виктор Дмитриевич; Белоцкий, Константин Михайлович
ABSTRACT Primordial black hole (PBH) binaries forming in the early Universe may contribute to the merger events observed by the LIGOвЂ“VirgoвЂ“KAGRA collaborations. Moreover, the inferred merger rate constraints the fraction of PBH with masses $m \sim 10 \, {\rm M}_{\odot }$ in the dark matter (DM) to fPBH в‰І 10в€’3. This constraint assumes that after the formation of PBH binaries, they do not get destroyed or their parameters are not perturbed until the merger. However, PBHs themselves contribute to the formation of early DM structures in which the interactions between PBHs take place actively. This leads to the fact that the binaries can be perturbed in such a way that their lifetime becomes longer than the Hubble time tH. In this work, we consider the effect of the initial spatial Poisson distribution of PBHs on the structure formation at the high redshifts z в‰і 10. Next, we explore the evolution of such haloes due to the interaction of PBHs with each other and with DM particles. We show that the early haloes evolve on time-scales much shorter than the age of the Universe. Furthermore, for fractions of PBHs fPBH andamp;lt; 1, the internal dynamics of a halo is significantly accelerated due to the dynamical friction of PBHs against DM particles. As a result, a significant fraction of binaries will be perturbed in such structures, and the gravitational waves constraints on PBHs with masses $m \sim 10 \, {\rm M}_{\odot }$ can be weakened to fPBH в€ј 0.1.
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Gravitational Waves from the Merger of Two Primordial Black Hole Clusters
(2023) Eroshenko, Y.; Stasenko, V.; Стасенко, Виктор Дмитриевич
The orbital evolution of a binary system consisting of two primordial black hole clusters is investigated. Such clusters are predicted in some theoretical models with broken symmetry in the inflation Lagrangian. A cluster consists of the most massive central black hole surrounded by many smaller black holes. Similar to single primordial black holes, clusters can form gravitationally bounded pairs and merge during their orbital evolution. The replacement of single black holes by such clusters significantly changes the entire merger process and the final rate of gravitational wave bursts in some parameter ranges (with sufficiently large cluster radii). A new important factor is the tidal gravitational interaction of the clusters. It leads to an additional dissipation of the orbital energy, which is transferred into the internal energy of the clusters or carried away by black holes flying out of the clusters. Comparison with the data of gravitational-wave telescopes allows one to constrain the fractions of primordial black holes in clusters, depending on their mass and compactness. Even the primordial black hole fraction in the composition of dark matter в‰ѓ1 turns out to be compatible with LIGO/Virgo observational data, if the black holes are in clusters.