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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)

Statistics of soliton-bearing systems with additive noise

2001 · ARTICLE · en

We present a consistent method to calculate the probability distribution of soliton parameters in systems with additive noise. Even though the noise is weak, we are interested in probabilities of large fluctuations ~generally non-Gaussian! which are beyond perturbation theory. Our method is a development of the instanton formalism ~method of optimal fluctuation! based on a saddle-point approximation in the path integral. We first solve a fundamental problem of soliton statistics governed by a noisy nonlinear Schro¨dinger equation. We then apply our method to optical soliton transmission systems using signal control elements ~filters and amplitude and phase modulators!.

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Shedding and interaction of solitons in imperfect medium

2001 · ARTICLE · en

The propagation of a soliton pattern through one-dimensional medium with weakly disordered dispersion is considered. Solitons, perturbed by this disorder, radiate. The emergence of a long-range interaction between the solitons, mediated by the radiation, is reported. Basic soliton patterns are analyzed. The interaction is triple and is extremely sensitive to the phase mismatch and relative spatial separations within the pattern. This phenomenon is a generic feature of any problem explaining adiabatic evolution of solitons through a medium with frozen disorder.

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Solitons in a disordered anisotropic optical medium

2001 · ARTICLE · en

The radiation-mediated interaction of solitons in a one-dimensional nonlinear medium (optical fiber) with birefringent disorder is shown to be independent of the separation between solitons. The effect produces a potentially dangerous contribution to the signal lost.

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Passive scalar in a large-scale velocity field

1999 · ARTICLE · en

We consider advection of a passive scalar u (t,r) by an incompressible large-scale turbulent flow. In the framework of the Kraichnan model all PDF’s ~probability distribution functions! for the single-point statistics of u and for the passive scalar difference u (r1)2u (r2) ~for separations r12r2 lying in the convective interval! are found.

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Intermittency in Burgers' Turbulence

1997 · ARTICLE · en

We consider the tails of probability density function (PDF) for the velocity that satisfies Burgers equation driven by a Gaussian large-scale force. The saddle-point approximation is employed in the path integral so that the calculation of the PDF tails boils down to finding the special field-force configuration (instanton) that realizes the extremum of probability. For the PDFs of velocity and its derivatives u(k)=∂kxu, the general formula is found: lnP(|u(k)|)∝−(|u(k)|/Rek)3/(k+1).

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Viscous Instanton for Burgers' Turbulence

1997 · ARTICLE · en

We consider the tails of probability density functions (PDF) for different characteristics of velocity that satisfies Burgers equation driven by a large-scale force. The saddle-point approximation is employed in the path integral so that the calculation of the PDF tails boils down to finding the special field-force configuration (instanton) that realizes the extremum of probability. We calculate high moments of the velocity gradient $\partial_xu$ and find out that they correspond to the PDF with $\ln[{\cal P}(\partial_xu)]\propto-(-\partial_xu/{\rm Re})^{3/2}$ where ${\rm Re}$ is the Reynolds number. That stretched exponential form is valid for negative $\partial_xu$ with the modulus much larger than its root-mean-square (rms) value. The respective tail of PDF for negative velocity differences $w$ is steeper than Gaussian, $\ln{\cal P}(w)\sim-(w/u_{\rm rms})^3$, as well as single-point velocity PDF $\ln{\cal P}(u)\sim-(|u|/u_{\rm rms})^3$. For high velocity derivatives $u^{(k)}=\partial_x^ku$, the general formula is found: $\ln{\cal P}(|u^{(k)}|)\propto -(|u^{(k)}|/{\rm Re}^k)^{3/(k+1)}$.

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Instantons and Intermittency

1996 · ARTICLE · en

We describe the method for finding the non-Gaussian tails of the probability distribution function (PDF) for solutions of a stochastic differential equation, such as the convection equation for a passive scalar, the random driven Navier-Stokes equation, etc. The existence of such tails is generally regarded as a manifestation of the intermittency phenomenon. Our formalism is based on the WKB approximation in the functional integral for the conditional probability of large fluctuation. We argue that the main contribution to the functional integral is given by a coupled field-force configuration—the instanton. As an example, we examine the correlation functions of the passive scalar u advected by a large-scale velocity field δ correlated in time. We find the instanton determining the tails of the generating functional, and show that it is different from the instanton that determines the probability distribution function of high powers of u. We discuss the simplest instantons for the Navier-Stokes equation. © 1996 The American Physical Society.

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THEORY OF RANDOM ADVECTION IN TWO DIMENSIONS

1996 · ARTICLE · en

The steady statistics of a passive scalar advected by a random two-dimensional flow of an incompressible fluid is described at scales less than the correlation length of the flow and larger than the diffusion scale. The probability distribution of the scalar is expressed via the probability distribution of the line stretching rate. The description of the line stretching can be reduced to the classical problem of studying the product of many matrices with a unit determinant. We found a change of variables which allows one to map the matrix problem into a scalar one and to prove thus a central limit theorem for the statistics of the stretching rate. The proof is valid for any finite correlation time of the velocity field. Whatever be the statistics of the velocity field, the statistics of the passive scalar in the inertial interval of scales is shown to approach Gaussianity as one increases the Peclet number Pe (the ratio of the pumping scale to the diffusion one). The first n

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The fourth-order correlation function of a randomly advected passive scalar

1995 · ARTICLE · en

Advection of a passive scalar $\theta$ in $d=2$ by a large-scale velocity field rapidly changing in time is considered. The Gaussian feature of the passive scalar statistics in the convective interval was discovered in \cite{95CFKLa}. Here we examine deviations from the Gaussianity: we obtain analytically the simultaneous fourth-order correlation function of $\theta$. Explicit expressions for fourth-order objects, like $\langle(\theta_1-\theta_2)^4\rangle$ are derived.

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Normal and anomalous scaling of the fourth-order correlation function of a randomly advected passive scalar

1995 · ARTICLE · en

For a delta-correlated velocity field, simultaneous correlation functions of a passive scalar satisfy closed equations. We analyze the equation for the four-point function. To describe a solution completely, one has to solve the matching problems at the scale of the source and at the diffusion scale. We solve both the matching problems and thus find the dependence of the four-point correlation function on the diffusion and pumping scale for large space dimensionality $d$. It is shown that anomalous scaling appears in the first order of $1/d$ perturbation theory. Anomalous dimensions are found analytically both for the scalar field and for it's derivatives, in particular, for the dissipation field.

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Курсы (6)