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Лебедев Владимир Валентинович

Международная лаборатория физики конденсированного состояния

Профиль на hse.ru ↗ тел.: 15234
Публикаций
71
Языков
1
Наград
11
Конференций
0
Профиль Публикации (71) Курсы (6)

Профессиональные интересы

Динамические свойства сильно неравновесных систем и мягкой материи: турбулентность, динамика полимерных растворов, динамика жидких кристаллов, динамика биологических мембран.

Должности

  • Главный научный сотрудник — Международная лаборатория физики конденсированного состояния
  • Профессор — Факультет физики
  • Академический руководитель образовательной программы — Физика

Био

  • · Начал работать в НИУ ВШЭ в 2016 году.
  • · Научно-педагогический стаж: 55 лет.

Образование

  • 2003 · Член-корреспондент РАН
  • 1990 · Доктор физико-математических наук
  • 1979 · Кандидат физико-математических наук
  • 1976 · Специалитет: Московский физико-технический институт, факультет: ФОПФ, специальность «Автоматика и электроника», квалификация «Инженер-физик»

Опыт работы

  • · Академический руководитель магистерской программы на факультете физики НИУ ВШЭ.
  • · Чтение лекций для студентов НИУ ВШЭ и МФТИ.
  • · 2003—2018: директор Института теоретической физики имени Л.Д.Ландау РАН
  • · 8 лет заведующий лабораторией современной гидродинамики, руководство студентами и аспирантами, более 150 публикаций в рецензируемых журналах.

Награды и поощрения

  • · Благодарность проректора НИУ ВШЭ (январь 2026)
  • · Благодарность проректора НИУ ВШЭ (январь 2025)
  • · Благодарность декана факультета физики НИУ ВШЭ (январь 2023)
  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2025–2026, 2024–2025, 2023–2024)
  • · Надбавка за публикацию в международном рецензируемом научном издании (2022–2023, 2021–2022, 2019–2021, 2017–2018)
  • · Лучший академический руководитель в номинации «Прием иностранных студентов» — 2025
  • · Лучший академический руководитель в номинации «Сбалансированность образования» — 2025
  • · Лучший академический руководитель в номинации «Лояльность студентов к продолжению образования в НИУ ВШЭ» — 2023–2024
  • · Лучший академический руководитель в номинации «Удовлетворенность студентов качеством образовательной программы» — 2024
  • · Лучший академический руководитель в номинации «Привлечение студентов» — 2023
  • · Лучший академический руководитель в номинации «Работа студентов с внешними заказчиками» — 2023

Гранты и проекты

  • 2016 · Парфеньев Владимир Михайлович, ««Нелинейные явления в плазмонике и гидродинамике: теория спазера и генерация завихренности поверхностными волнами»» Кандидатская диссертация, научный руководитель: Лебедев В.В., 01.04.02 — теоретическая физика Дата защиты: 30 декабря 2016 Текст диссертации выложен на сайте ИТФ им. Л.Д.Ландау РАН 17 июня 2016г.
  • 2016 · Белан Сергей Александрович, ««Статистические модели динамики инерционных частиц в пространственно-неоднородных турбулентных течениях»» Кандидатская диссертация, научный руководитель: Лебедев В.В., 01.04.02 — теоретическая физика Дата защиты: 30 декабря 2016 Текст диссертации выложен на сайте ИТФ им. Л.Д.Ландау РАН 17 июня 2016г.

Идентификаторы исследователя

  • ORCID: 0000-0002-2932-4856
  • ResearcherID: K-1858-2017
  • SPIN РИНЦ: 6595-7991
  • Scopus AuthorID: 8971405800

Публикации (71)

Nonlinear fluctuation effects in dynamics of freely suspended films

2015 · ARTICLE · en

Long-scale dynamic fluctuation phenomena in freely suspended films is analyzed. We consider isotropic films that, say, can be pulled from bulk smectic- A liquid crystals. The key feature of such objects is possibility of bending deformations of the film. The bending (also known as flexular) mode turns out to be anomalously weakly attenuated. In the harmonic approximation there is no viscous-like damping of the bending mode, proportional to q 2 ( q is the wave vector of the mode), since it is forbidden by the rotational symmetry. Therefore, the bending mode is strongly affected by nonlinear dynamic fluctuation effects. We calculate the dominant fluctuation contributions to the damping of the bending mode due to its coupling to the inplane viscous mode, which restores the viscous-like q 2 damping of the bending mode. Our calculations are performed in the framework of the perturbation theory where the coupling of the modes is assumed to be small, then the bending mode damping is relatively weak. We discuss our results in the context of existing experiments and numeric simulations of the freely suspended films and propose possible experimental observations of our predictions.

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Universal Profile of the Vortex Condensate in Two-Dimensional Turbulence

2014 · ARTICLE · en

An inverse turbulent cascade in a restricted two-dimensional periodic domain creates a condensate-a pair of coherent system-size vortices. We perform extensive numerical simulations of this system and carry out theoretical analysis based on momentum and energy exchanges between the turbulence and the vortices. We show that the vortices have a universal internal structure independent of the type of small-scale dissipation, small-scale forcing, and boundary conditions. The theory predicts not only the vortex inner region profile, but also the amplitude, which both perfectly agree with the numerical data.

DOI ↗ PDF ↗

Theory of Random Fibre Laser

2014 · ARTICLE · en

We develop the theory explaining the role of nonlinearity in generation radiation in a fiber laser that is pumped by external light. The pumping energy is converted into the generating signal due to the Raman scattering supplying an effective gain for the signal. The signal is generated with frequencies near the one corresponding to the maximum value of the gain. Generation conditions and spectral properties of the generated signal are examined. We focus mainly on the case of a random laser where reflection of the signal occurs on impurities of the fiber. From the theoretical standpoint, kinetics of a wave system close to an integrable one are investigated. We demonstrate that in this case, the perturbation expansion in the kinetic equation has to use the closeness to the integrable case.

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Asymptotic freedom at zero temperature in free-standing crystalline membranes

2014 · ARTICLE · en

We investigate the effects of quantum (zero-temperature) long-wavelength fluctuations of free-standing crystalline membranes, which are two-dimensional objects embedded into three-dimensional space. The fluctuations produce logarithmic renormalization of elasticity and bending moduli of the membranes. We find one-loop RG equations to demonstrate that the system is in the “asymptotic freedom” regime; that is, the quantum fluctuations destabilize the flat membrane phase.

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Tail-constraining stochastic linear-quadratic control: large deviation and statistical physics approach

2012 · ARTICLE · en

Abstract. The standard de nition of the stochastic risk-sensitive linear{quad- ratic (RS-LQ) control depends on the risk parameter, which is normally left to be set exogenously. We reconsider the classical approach and suggest two alternatives, resolving the spurious freedom naturally. One approach consists in seeking for the minimum of the tail of the probability distribution function (PDF) of the cost functional at some large xed value. Another option suggests minimizing the expectation value of the cost functional under a constraint on the value of the PDF tail. Under the assumption of resulting control stability, both problems are reduced to static optimizations over a stationary control matrix. The solutions are illustrated using the examples of scalar and 1D chain (string) systems. The large deviation self-similar asymptotic of the cost functional PDF is analyzed.

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Magnetic field correlations in a random flow with strong steady shear

2011 · ARTICLE · en

We analyze magnetic kinematic dynamo in a conducting fluid where the stationary shear flow is accompanied by relatively weak random velocity fluctuations. The diffusionless and diffusion regimes are described. The growth rates of the magnetic field moments are related to the statistical characteristics of the flow describing divergence of the Lagrangian trajectories. The magnetic field correlation functions are examined, we establish their growth rates and scaling behavior. General assertions are illustrated by explicit solution of the model where the velocity field is short-correlated in time.

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Kinematic magnetic dynamo in a random flow with strong average shear

2010 · ARTICLE · en

We analyze the kinematic dynamo in a conducting fluid where the stationary shear flow is accompanied by relatively weak random velocity fluctuations. The diffusionless and diffusion regimes are described. The growth rates of the magnetic field moments are related to the statistical characteristics of the flow describing the divergence of Lagrangian trajectories. A degree of anisotropy of the magnetic field is estimated. We demonstrate that Zeldovich’s ‘antidynamo theorem’ is wrong.

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Universal velocity profile for coherent vortices in two-dimensional turbulence

2010 · ARTICLE · en

Two-dimensional turbulence generated in a finite box produces large-scale coherent vortices coexisting with small-scale fluctuations. We present a rigorous theory explaining the  =1/4 scaling in the Vr− law of the velocity spatial profile within a vortex, where r is the distance from the vortex center. This scaling, consistent with earlier numerical and laboratory measurements, is universal in its independence of details of the smallscale injection of turbulent fluctuations and details of the shape of the box.

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Universal features of cell polarization processes.

2009 · ARTICLE · en

Cell polarization plays a central role in the development of complex organisms. It has been recently shown that cell polarization may follow from the proximity to a phase separation instability in a bistable network of chemical reactions. An example which has been thoroughly studied is the formation of signaling domains during eukaryotic chemotaxis. In this case, the process of domain growth may be described by the use of a constrained time-dependent Landau–Ginzburg equation, admitting scale-invariant solutions `a la Lifshitz and Slyozov. The constraint results here from a mechanism of fast cycling of molecules between a cytosolic, inactive state and a membrane-bound, active state, which dynamically tunes the chemical potential for membrane binding to a value corresponding to the coexistence of different phases on the cell membrane. We provide here a universal description of this process both in the presence and in the absence of a gradient in the external activation field. Universal power laws are derived for the time needed for the cell to polarize in a chemotactic gradient, and for the value of the smallest detectable gradient. We also describe a concrete realization of our scheme based on the analysis of available biochemical and biophysical data.

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Strong effect of weak diffusion on scalar turbulence at large scales

2007 · ARTICLE · en

Passive scalar turbulence forced steadily is characterized by the velocity correlation scale L, injection scale l, and diffusive scale rd. The scales are well separated if the diffusivity is small, rdl ,L, and one normally says that effects of diffusion are confined to smaller scales, rrd. However, if the velocity is single scale, one finds that a weak dependence of the scalar correlations on the molecular diffusivity persists to even larger scales, e.g., lrrd (E. Balkovsky et al., Pis’ma Zh. Eksp. Teor. Fiz. 61, 1012 1995 JETP Lett. 61, 1049 1995). We consider the case of L l and report a counterintuitive result, namely the emergence of a new range of large scales, L rl2 / rd, where the diffusivity shows a strong effect on scalar correlations.

DOI ↗ PDF ↗

Курсы (6)