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Хлопов, Максим Юрьевич

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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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Хлопов

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Максим Юрьевич

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Теперь показываю 1 - 10 из 103

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A study on charged compact stars
(2019) Maurya, S. K.; Ray, S.; Aziz, A.; Chardonnet, P.; Khlopov, M.; Хлопов, Максим Юрьевич
© 2019 World Scientific Publishing Company. In this paper, the Einstein-Maxwell spacetime is considered for compact stellar system. To find out solutions of the field equations, we adopt a finite and positive well-behaved metric potential. Under this particular choice, we therefore develop the expressions of the physical features, such as mass, charge, density and pressure, for stellar system in embedding class 1 spacetime. It is observed that all these features are physically viable. In the model, some known compact stars, viz. 4U1820-30, 4U1608-52 and EXO1745-248(I)&(II) are studied successfully through physical analysis. It is also interesting to note that the obtained set of regular solutions to the Einstein-Maxwell equations represents an electromagnetic mass model for isotropic fluid without invoking any negative pressure.
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Revisiting primordial black hole evolution
(2020) Paik, B.; Ray, S.; Khlopov, M.; Хлопов, Максим Юрьевич
© 2020 by the authors.Primordial black holes (PBHs) are the sensitive probe for physics and cosmology of very early Universe. The observable effect of their existence depends on the PBH mass. Mini PBHs evaporate and do not survive to the present time, leaving only background effect of products of their evaporation, while PBHs evaporating now can be new exotic sources of energetic particles and gamma rays in the modern Universe. Here we revisit the history of evolution of mini PBHs. We follow the aspects associated with growth versus evaporation rate of "a mini PBH being trapped inside intense local cosmological matter inhomogeneity". We show that the existence of baryon accretion forbidden black hole regime enables constraints on mini PBHs with the mass M ≤ 5.5 x 1013 g. On the other hand, we propose the mechanism of delay of evaporation of primordial population of PBHs of primordial mass range 5.5 x 1013 g ≤ M ≤ 5.1 x 1014 g. It can provide their evaporation to be the main contributor to g-ray flux distribution in the current Universe. At the final stage of evaporation these PBHs can be the source of ultrahigh energy cosmic rays and gamma radiation challenging probe for their existence in the LHAASO experiment.
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New Trends in BSM Physics and Cosmology
(2020) Khlopov, M. Yu.; Хлопов, Максим Юрьевич
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Study on anisotropic strange stars in f(T, T ) gravity
(2020) Salako, I. G.; Ray, S.; Arouko, M. Z.; Saha, P.; Khlopov, M.; Хлопов, Максим Юрьевич
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) licenseIn this work, we study the existence of strange stars in the background of f(T, T ) gravity in the Einstein spacetime geometry, where T is the torsion tensor and T is the trace of the energy-momentum tensor. The equations of motion are derived for anisotropic pressure within the spherically symmetric strange star. We explore the physical features like energy conditions, mass-radius relations, modified Tolman–Oppenheimer–Volkoff (TOV) equations, principal of causality, adiabatic index, redshift and stability analysis of our model. These features are realistic and appealing to further investigation of properties of compact objects in f(T, T ) gravity as well as their observational signatures.
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Light gravitino dark matter: LHC searches and the Hubble tension
(2020) Gu, Y. C.; Khlopov, M.; Wu, L.; Yang, J. M.; Хлопов, Максим Юрьевич
The recent measurements of the cosmological parameter H-0 from the direct local observations and the inferred value from the cosmic microwave background show approximately 4 sigma discrepancy. This may indicate new physics beyond the standard ACDM. We investigate the keV gravitino dark matter that has a small fraction of nonthermal components (e.g., from the late decay of next-to-lightest-supersymmetric-particle bino) under various cosmological constraints. We find such a scenario is highly predictive and can be tested by searching for the dilepton plus missing energy events at the LHC. Besides, we also discuss its implication for Hubble tension, which can be reduced to 3 sigma level marginally.
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Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider
(2020) Alimena, J.; Beacham, J.; Borsato, M.; Cheng, Y. Y.; Khlopov, M. Y.; Хлопов, Максим Юрьевич
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton-proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches for new physics at the LHC, often requiring customized techniques to identify, for example, significantly displaced decay vertices, tracks with atypical properties, and short track segments. Given their non-standard nature, a comprehensive overview of LLP signatures at the LHC is beneficial to ensure that possible avenues of the discovery of new physics are not overlooked. Here we report on the joint work of a community of theorists and experimentalists with the ATLAS, CMS, and LHCb experiments-as well as those working on dedicated experiments such as MoEDAL, milliQan, MATHUSLA, CODEX-b, and FASER-to survey the current state of LLP searches at the LHC, and to chart a path for the development of LLP searches into the future, both in the upcoming Run 3 and at the high-luminosity LHC. The work is organized around the current and future potential capabilities of LHC experiments to generally discover new LLPs, and takes a signature-based approach to surveying classes of models that give rise to LLPs rather than emphasizing any particular theory motivation. We develop a set of simplified models; assess the coverage of current searches; document known, often unexpected backgrounds; explore the capabilities of proposed detector upgrades; provide recommendations for the presentation of search results; and look towards the newest frontiers, namely high-multiplicity 'dark showers', highlighting opportunities for expanding the LHC reach for these signals.
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Cosmological probes of supersymmetric field theory models at superhigh energy scales
(2019) Ketov, S. V.; Khlopov, M. Y.; Хлопов, Максим Юрьевич
© 2019 by the authors. The lack of positive results in searches for supersymmetric (SUSY) particles at the Large Hadron Collider (LHC) and in direct searches forWeakly Interacting Massive Particles (WIMPs) in the underground experiments may hint to a super-high energy scale of SUSY phenomena beyond the reach of direct experimental probes. At such scales the supergravity models based on Starobinsky inflation can provide the mechanisms for both inflation and superheavy dark matter. However, it makes the indirect methods the only way of testing the SUSY models, so that cosmological probes acquire the special role in this context. Such probes can rely on the nontrivial effects of SUSY physics in the early Universe, which are all model-dependent and thus can provide discrimination of the models and their parameters. The nonstandard cosmological features like Primordial Black Holes (PBHs) or antimatter domains in a baryon-asymmetric universe are discussed as possible probes for high energy scale SUSY physics.
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Removing the conspiracy of BSM physics and BSM cosmology
(2019) Khlopov, M. Y.; Хлопов, Максим Юрьевич
© 2019 World Scientific Publishing Company.The standard model (SM) of elementary particles finds no contradictions in the experimental data, but appeals to extensions for solutions of its internal problems and physical basis of the modern cosmology. The latter is based on inflationary models with baryosynthesis and dark matter/energy that involves Physics beyond the standard model (BSM) of elementary particles. However, studies of the BSM physical basis of the modern cosmology inevitably reveals additional particle model-dependent cosmological consequences that go beyond the modern standard cosmological model. The mutual relationship of the BSM particle physics basis of the modern cosmology and the nontrivial features of the corresponding cosmological scenario are the subject of this paper.
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Preface
(2019) Khlopov, M. Y.; Хлопов, Максим Юрьевич
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Gravitational waves in the extended theory of gravity
(2021) Chowdhury, S. R.; Khlopov, M.; Хлопов, Максим Юрьевич
© 2021 World Scientific Publishing Company.Extended theories of gravity are considered as a new approach for solving the infrared and ultraviolet scale problems; the standard theory of gravity (general relativity) and observational evidence of gravitational waves and subsequent identification of the number of existing polarizations are an effective tool for testing general relativity and extended theories of gravity. The Newman-Penrose method is used to characterize the polarization modes for specific forms of f(R) in the present study. Both the forms of the f(R) theory belong to far more general variational class of gravitational waves, capable of presenting up to six separate polarizations states. We have introduced a new f(R) gravity model as an attempt to have a theory with more parametric regulations so that the model can be used to describe existing issues and discover different directions in gravity physics. The primary goal of this research is to look into the properties of gravitational waves with new cases. The model shows the existence of scalar degrees of freedom in f(R) gravity metric notation.