Dmitry Gorbunov
A5045101705- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Relativity and Gravitational Theory
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Radiation Therapy and Dosimetry
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Aquatic and Environmental Studies
- Advanced X-ray Imaging Techniques
Institute for Nuclear Research
2015-2024
Moscow Institute of Physics and Technology
2015-2024
Krasnoyarsk State Medical University
2016-2021
Russian Academy of Sciences
2004-2019
Lomonosov Moscow State University
1998-2016
Development Agency of Serbia
2013
Osaka City University
2012
Austrian Academy of Sciences
2012
Institute of High Energy Physics
2012
École Polytechnique Fédérale de Lausanne
2008
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and latest astrophysical data.
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
We analyse the process of reheating Universe in electroweak theory where Higgs field plays a role inflaton. estimate maximal temperature and fix initial conditions for radiation-dominated phase expansion framework Standard Model (SM) nuMSM -- minimal extension SM by three right-handed singlet fermions. show that inflationary epoch is followed matter dominated stage related to oscillations. investigate energy transfer from Higgs-inflaton particles radiation starts at T_r~(3-15)*10^{13} GeV,...
The Telescope Array (TA) experiment, located in the western desert of Utah,USA, is designed for observation extensive air showers from extremely high energy cosmic rays. experiment has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection shower particles at ground level and photons along track. TA started full hybrid March, 2008. In this article we describe design technical features detector.
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, particle physics in each case viewed both theoretical experimental/observational perspectives. After reviewing the role active neutrinos physics, we focus on context Matter puzzle. Here, first motivation for based challenges tensions purely cold scenarios. then round out discussion by critically summarizing known...
We examine the theoretical motivations for long-lived particle (LLP) signals at LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are common prediction wide range theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, represent natural generic possibility physics beyond SM (BSM). In most cases LLP lifetime can be treated free parameter from $\mu$m scale up to Big Bang Nucleosynthesis limit $\sim 10^7$m....
Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along beam collision axis, outside acceptance existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from ATLAS interaction point and shielded by concrete rock, will host suite experiments probe standard model (SM) processes search for physics beyond (BSM). In this report, we review status civil engineering plans explore...
The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos ν_{e} observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred as "gallium anomaly," which could be interpreted evidence for oscillations between and sterile (ν_{s}) states. A 3.414-MCi ^{51}Cr source placed at center two nested Ga volumes were made production ^{71}Ge through charged current reaction,...
It is shown by an explicit calculation that the excitations about self-accelerating cosmological solution of Dvali-Gabadaze-Porrati model contain a ghost mode. This raises serious doubts viability this solution. Our analysis reveals similarity between quadratic theory for perturbations around universe and Abelian gauge with two St\"uckelberg fields.
We study the phenomenology of a realistic version chaotic inflationary model, which can be fully and directly explored in particle physics experiments. The inflaton mixes with Standard Model Higgs boson via scalar potential, no additional scales above electroweak scale are present model. inflaton-to-Higgs coupling is responsible for both reheating Early Universe production collisions. find allowed range light mass, 270 MeV<~m_chi<~1.8 GeV, discuss ways to inflaton. most promising two-body...
We show that introducing $R^2$-term makes the Higgs-inflation and Higgs-dilaton inflation consistent models: strong coupling energy scales in scalar, gauge gravity sectors all are lifted up to Planck scale.
A bstract We review and revise phenomenology of the GeV-scale heavy neutral leptons (HNLs). extend previous analyses by including more channels HNLs production decay provide with refined treatment, QCD corrections for masses $$ \mathcal{O} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (1) GeV. summarize relevance individual different masses, resolving a few discrepancies in literature. Our final results are directly suitable sensitivity studies...
It has been recently suggested~\cite{Berezhiani:2015yta} that emerging tension between cosmological parameter values derived in high-redshift (CMB anisotropy) and low-redshift (cluster counts, Hubble constant) measurements can be reconciled a model which contains subdominant fraction of dark matter decaying after recombination. We check the against CMB Planck data. find lensing anisotropies by large-scale structure gives strong extra constraints on this model, limiting as $F<8\%$ at...
First results from the BEST Collaboration searching for short-baseline neutrino oscillations to sterile neutrinos with a high-intensity ${}^{51}$Cr monoenergetic source reaffirm that so-called gallium anomaly, deficit in electron neutrinos, persists. $4\ensuremath{\sigma}$ deficits were observed ${}^{71}$Ge production rates at two different distance scales, which could be interpreted as between an and hypothetical neutrino. The are consistent mass squared difference above about 0.5...
We discuss cosmic domain walls described by a tension red-shifting with the expansion of Universe.These melting emit gravitational waves low-frequency spectral shape Ωgw ∝ f 2 corresponding to index γ = 3 favoured recent NANOGrav 15 yrs data.We concrete high-energy physics scenario leading such wall network in early Universe.This involves feebly coupled scalar field, which can serve as promising dark matter candidate.We identify parameters model matching wave characteristics observed...
Recently, the Baksan Experiment on Sterile Transitions (BEST) has presented results [1] confirming gallium anomaly---a lack of electron neutrinos ${\ensuremath{\nu}}_{e}$ at calibrations SAGE [2,3] and GALLEX [4]---at statistical significance exceeding $5\ensuremath{\sigma}$. This result is consistent with explanation anomaly as neutrino oscillations into a sterile neutrino, ${\ensuremath{\nu}}_{s}$. Within this explanation, BEST experiment itself provides strongest evidence for among all...
A bstract We study the production of hypothetical vector particles, dark photons γ ′, with masses in range 0.4–1.8 GeV via inelastic proton bremsstrahlung. further develop approach refs. [1–3], where for first time we considered contributions to cross section that are associated Pauli form factor ppγ ′ vertex and obtained new splitting functions. demonstrate numerically importance these corrections full bremsstrahlung refine sensitivity ongoing future fixed-target experiments T2K, DUNE SHiP...
High energy photon colliders (γγ,γe) are based on e - linear where high photons produced using Compton scattering of laser light electrons just before the interaction point. This paper is a part Technical Design Report collider TESLA. 1 Physics program, possible parameters and some technical aspects at TESLA discussed.