Maxim Khlopov - Academia.edu (original) (raw)

Papers by Maxim Khlopov

Research paper thumbnail of 10 Years of Dark Atoms of Composite Dark Matter

arXiv (Cornell University), Dec 3, 2015

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Research paper thumbnail of Dark Atoms of Dark Matter and Their Stable Charged Constituents

Astroparticle, Particle, Space Physics, Radiation Interaction, Detectors and Medical Physics Applications

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Research paper thumbnail of Baryon-Antibaryon Annihilation in the Evolution of Antimatter Domains in Baryon-Asymmetric Universe

Universe

Non-trivial baryosynthesis scenarios can lead to the existence of antimatter domains in a baryon-... more Non-trivial baryosynthesis scenarios can lead to the existence of antimatter domains in a baryon-asymmetrical Universe. The consequences of antibaryon-baryon annihilation at the border of antimatter domains is investigated. Low-density antimatter domains are further classified according to the boundary interactions. A similar classification scheme is also proposed for higher-densities antimatter domains. The antiproton-proton annihilation interactions are therefore schematized and evaluated. The antinuclei-nuclei-interaction patterns are investigated. The two-point correlation functions for antimatter domains are studied in the case of baryon-antibaryon boundary interactions, which influence the space and time evolution. The space-time evolution of antimatter domains after the photon thermalization epoch is analyzed.

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Research paper thumbnail of Dark Atom Solution for the Puzzles of Direct Dark Matter Search

Physical Sciences Forum

The puzzle of direct dark matter searches can b solved in the model of an OHe dark atom, which co... more The puzzle of direct dark matter searches can b solved in the model of an OHe dark atom, which consists of a stable O−− lepton core and a nuclear interacting (alpha particle) shell of a primordial helium nuclei. In this model, positive results of the DAMA group can be explained by annual modulation of radiative capture of OHe atoms to low-energy bound states with sodium nuclei, which does not take place under the conditions of other underground experiments. The existence of such a low-energy bound state is the key problem of the OHe model of composite dark matter. The complexity of this problem, which has not found a correct solution during the last 15 years, requires a consistent approach to its solution. Within the framework of the proposed approach to such modeling, in order to reveal the essence of the processes of interaction of OHe with the nuclei of baryonic matter, a classical model is used, to which the effects of quantum physics and final size of nuclei are successively ad...

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Research paper thumbnail of Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider

Journal of Physics G: Nuclear and Particle Physics

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Research paper thumbnail of Anisotropic compact stars: Constraining model parameters to account for physical features of tidal Love numbers

Annals of Physics

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Research paper thumbnail of A shell like kilometer spaced array or a honey comb one around Icecube

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Research paper thumbnail of Light gravitino dark matter: LHC searches and the Hubble tension

Physical Review D

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Research paper thumbnail of New Physics of Strong Interaction and Dark Universe

Universe

The history of dark universe physics can be traced from processes in the very early universe to t... more The history of dark universe physics can be traced from processes in the very early universe to the modern dominance of dark matter and energy. Here, we review the possible nontrivial role of strong interactions in cosmological effects of new physics. In the case of ordinary QCD interaction, the existence of new stable colored particles such as new stable quarks leads to new exotic forms of matter, some of which can be candidates for dark matter. New QCD-like strong interactions lead to new stable composite candidates bound by QCD-like confinement. We put special emphasis on the effects of interaction between new stable hadrons and ordinary matter, formation of anomalous forms of cosmic rays and exotic forms of matter, like stable fractionally charged particles. The possible correlation of these effects with high energy neutrino and cosmic ray signatures opens the way to study new physics of strong interactions by its indirect multi-messenger astrophysical probes.

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Research paper thumbnail of Study on Anisotropic Strange Stars in f ( T , T ) Gravity

Universe

In this work, we study the existence of strange stars in the background of f(T,T) gravity in the ... more In 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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Research paper thumbnail of Revisiting Primordial Black Hole Evolution

Axioms

Primordial black holes (PBHs) are the sensitive probe for physics and cosmology of very early Uni... more 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 × 10 13 g. On the other hand, we propose the mechanism of delay of evaporation of primordial population of PBHs of primordial mass range 5.5 × 10 13 g ≤ M ≤ 5.1 × 10 14 g. It can provide their evaporation to be the main contributor to γ -ray flux ...

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Research paper thumbnail of Cosmoparticle physics of dark matter

EPJ Web of Conferences

The lack of confirmation for the existence of supersymmetric particles and Weakly Interacting Mas... more The lack of confirmation for the existence of supersymmetric particles and Weakly Interacting Massive Particles (WIMPs) appeals to extension of the field of studies of the physical nature of dark matter, involving nonsupersymmetric and non-WIMP solutions. We briefly discuss some examples of such candidates in their relationship with extension of particle symmetry and pattern of symmetry breaking. We specify in the example of axion-like particles nontrivial features of cosmological reflection of the structure and pattern of Peccei-Quinn-like symmetry breaking. The puzzles of direct and indiect dark matter searches can find solution in the approach of composite dark matter. The advantages and open problems of this approach are specified. We note that detailed analysis of cosmological consequences of any extension of particle model that provides candidates for dark matter inevitably leads to nonstandard features in the corresponding cosmological scenario. It makes possible to use metho...

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Research paper thumbnail of Study on charged strange stars in f(R, T) gravity

Journal of Cosmology and Astroparticle Physics

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Research paper thumbnail of Dark atom solution for puzzles of direct dark matter searches

Journal of Physics: Conference Series

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Research paper thumbnail of Antimatter as a probe for physical processes in the early Universe

Proceedings of International Europhysics Conference on High Energy Physics — PoS(hep2001)

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Research paper thumbnail of Cosmological Probes of Supersymmetric Field Theory Models at Superhigh Energy Scales

Symmetry

The lack of positive results in searches for supersymmetric (SUSY) particles at the Large Hadron ... more The lack of positive results in searches for supersymmetric (SUSY) particles at the Large Hadron Collider (LHC) and in direct searches for Weakly 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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Research paper thumbnail of Direct and Indirect Probes for Composite Dark Matter

Frontiers in Physics

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Research paper thumbnail of Anisotropic strange stars in the Einstein–Maxwell spacetime

The European Physical Journal C

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Research paper thumbnail of Regular black hole remnants and graviatoms with de Sitter interior as heavy dark matter candidates probing inhomogeneity of early universe

International Journal of Modern Physics D

We address the question of regular primordial black holes with de Sitter interior, their remnants... more We address the question of regular primordial black holes with de Sitter interior, their remnants and gravitational vacuum solitons G-lumps as heavy dark matter candidates providing signatures for inhomogeneity of early universe, which is severely constrained by the condition that the contribution of these objects in the modern density does not exceed the total density of dark matter. Primordial black holes and their remnants seem to be most elusive among dark matter candidates. However, we reveal a nontrivial property of compact objects with de Sitter interior to induce proton decay or decay of neutrons in neutron stars. The point is that they can form graviatoms, binding electrically charged particles. Their observational signatures as dark matter candidates provide also signatures for inhomogeneity of the early universe. In graviatoms, the cross-section of the induced proton decay is strongly enhanced, what provides the possibility of their experimental searches. We predict proto...

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Research paper thumbnail of The development of cross disciplinary studies in cosmology and particle physics on the platform of a Scientific-Educational complex of Virtual Institute of Astroparticle physics (VIA)

Journal of Physics: Conference Series

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Research paper thumbnail of 10 Years of Dark Atoms of Composite Dark Matter

arXiv (Cornell University), Dec 3, 2015

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Research paper thumbnail of Dark Atoms of Dark Matter and Their Stable Charged Constituents

Astroparticle, Particle, Space Physics, Radiation Interaction, Detectors and Medical Physics Applications

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Research paper thumbnail of Baryon-Antibaryon Annihilation in the Evolution of Antimatter Domains in Baryon-Asymmetric Universe

Universe

Non-trivial baryosynthesis scenarios can lead to the existence of antimatter domains in a baryon-... more Non-trivial baryosynthesis scenarios can lead to the existence of antimatter domains in a baryon-asymmetrical Universe. The consequences of antibaryon-baryon annihilation at the border of antimatter domains is investigated. Low-density antimatter domains are further classified according to the boundary interactions. A similar classification scheme is also proposed for higher-densities antimatter domains. The antiproton-proton annihilation interactions are therefore schematized and evaluated. The antinuclei-nuclei-interaction patterns are investigated. The two-point correlation functions for antimatter domains are studied in the case of baryon-antibaryon boundary interactions, which influence the space and time evolution. The space-time evolution of antimatter domains after the photon thermalization epoch is analyzed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dark Atom Solution for the Puzzles of Direct Dark Matter Search

Physical Sciences Forum

The puzzle of direct dark matter searches can b solved in the model of an OHe dark atom, which co... more The puzzle of direct dark matter searches can b solved in the model of an OHe dark atom, which consists of a stable O−− lepton core and a nuclear interacting (alpha particle) shell of a primordial helium nuclei. In this model, positive results of the DAMA group can be explained by annual modulation of radiative capture of OHe atoms to low-energy bound states with sodium nuclei, which does not take place under the conditions of other underground experiments. The existence of such a low-energy bound state is the key problem of the OHe model of composite dark matter. The complexity of this problem, which has not found a correct solution during the last 15 years, requires a consistent approach to its solution. Within the framework of the proposed approach to such modeling, in order to reveal the essence of the processes of interaction of OHe with the nuclei of baryonic matter, a classical model is used, to which the effects of quantum physics and final size of nuclei are successively ad...

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Research paper thumbnail of Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider

Journal of Physics G: Nuclear and Particle Physics

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Anisotropic compact stars: Constraining model parameters to account for physical features of tidal Love numbers

Annals of Physics

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A shell like kilometer spaced array or a honey comb one around Icecube

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Light gravitino dark matter: LHC searches and the Hubble tension

Physical Review D

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New Physics of Strong Interaction and Dark Universe

Universe

The history of dark universe physics can be traced from processes in the very early universe to t... more The history of dark universe physics can be traced from processes in the very early universe to the modern dominance of dark matter and energy. Here, we review the possible nontrivial role of strong interactions in cosmological effects of new physics. In the case of ordinary QCD interaction, the existence of new stable colored particles such as new stable quarks leads to new exotic forms of matter, some of which can be candidates for dark matter. New QCD-like strong interactions lead to new stable composite candidates bound by QCD-like confinement. We put special emphasis on the effects of interaction between new stable hadrons and ordinary matter, formation of anomalous forms of cosmic rays and exotic forms of matter, like stable fractionally charged particles. The possible correlation of these effects with high energy neutrino and cosmic ray signatures opens the way to study new physics of strong interactions by its indirect multi-messenger astrophysical probes.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Study on Anisotropic Strange Stars in f ( T , T ) Gravity

Universe

In this work, we study the existence of strange stars in the background of f(T,T) gravity in the ... more In 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.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Revisiting Primordial Black Hole Evolution

Axioms

Primordial black holes (PBHs) are the sensitive probe for physics and cosmology of very early Uni... more 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 × 10 13 g. On the other hand, we propose the mechanism of delay of evaporation of primordial population of PBHs of primordial mass range 5.5 × 10 13 g ≤ M ≤ 5.1 × 10 14 g. It can provide their evaporation to be the main contributor to γ -ray flux ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cosmoparticle physics of dark matter

EPJ Web of Conferences

The lack of confirmation for the existence of supersymmetric particles and Weakly Interacting Mas... more The lack of confirmation for the existence of supersymmetric particles and Weakly Interacting Massive Particles (WIMPs) appeals to extension of the field of studies of the physical nature of dark matter, involving nonsupersymmetric and non-WIMP solutions. We briefly discuss some examples of such candidates in their relationship with extension of particle symmetry and pattern of symmetry breaking. We specify in the example of axion-like particles nontrivial features of cosmological reflection of the structure and pattern of Peccei-Quinn-like symmetry breaking. The puzzles of direct and indiect dark matter searches can find solution in the approach of composite dark matter. The advantages and open problems of this approach are specified. We note that detailed analysis of cosmological consequences of any extension of particle model that provides candidates for dark matter inevitably leads to nonstandard features in the corresponding cosmological scenario. It makes possible to use metho...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Study on charged strange stars in f(R, T) gravity

Journal of Cosmology and Astroparticle Physics

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dark atom solution for puzzles of direct dark matter searches

Journal of Physics: Conference Series

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Antimatter as a probe for physical processes in the early Universe

Proceedings of International Europhysics Conference on High Energy Physics — PoS(hep2001)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cosmological Probes of Supersymmetric Field Theory Models at Superhigh Energy Scales

Symmetry

The lack of positive results in searches for supersymmetric (SUSY) particles at the Large Hadron ... more The lack of positive results in searches for supersymmetric (SUSY) particles at the Large Hadron Collider (LHC) and in direct searches for Weakly 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.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Direct and Indirect Probes for Composite Dark Matter

Frontiers in Physics

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Anisotropic strange stars in the Einstein–Maxwell spacetime

The European Physical Journal C

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Regular black hole remnants and graviatoms with de Sitter interior as heavy dark matter candidates probing inhomogeneity of early universe

International Journal of Modern Physics D

We address the question of regular primordial black holes with de Sitter interior, their remnants... more We address the question of regular primordial black holes with de Sitter interior, their remnants and gravitational vacuum solitons G-lumps as heavy dark matter candidates providing signatures for inhomogeneity of early universe, which is severely constrained by the condition that the contribution of these objects in the modern density does not exceed the total density of dark matter. Primordial black holes and their remnants seem to be most elusive among dark matter candidates. However, we reveal a nontrivial property of compact objects with de Sitter interior to induce proton decay or decay of neutrons in neutron stars. The point is that they can form graviatoms, binding electrically charged particles. Their observational signatures as dark matter candidates provide also signatures for inhomogeneity of the early universe. In graviatoms, the cross-section of the induced proton decay is strongly enhanced, what provides the possibility of their experimental searches. We predict proto...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The development of cross disciplinary studies in cosmology and particle physics on the platform of a Scientific-Educational complex of Virtual Institute of Astroparticle physics (VIA)

Journal of Physics: Conference Series

Bookmarks Related papers MentionsView impact