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Колоколов Игорь Валентинович

Базовая кафедра теоретической физики Института теоретической физики им. Л.Д. Ландау РАН

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Публикаций
0
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Профиль Публикации (53) Курсы (5)

Профессиональные интересы

неравновесная статистическая физикастатистическая гидродинамикаквантовые магнетикинелинейная оптикаКвантовые флуктуации в неупорядоченных системах

Должности

  • Заведующий кафедрой — Базовая кафедра теоретической физики Института теоретической физики им. Л.Д. Ландау РАН
  • Профессор — Базовая кафедра теоретической физики Института теоретической физики им. Л.Д. Ландау РАН

Био

  • · Начал работать в НИУ ВШЭ в 2016 году.
  • · Научно-педагогический стаж: 27 лет.

Образование

  • 2025 · Член-корреспондент РАН
  • 2010 · Ученое звание: Доцент
  • 1998 · Доктор физико-математических наук
  • 1983 · Специалитет: Новосибирский государственный университет им. Ленинского комсомола, специальность «Физика», квалификация «Физик»

Опыт работы

  • · 1983: В году закончил Новосибирский государственный университет, получил диплом по специальности «физика». В
  • · 1990: году защитил кандидатскую диссертацию по специальности «теоретическая физика», которая была посвящена развитию функциональных методов в статистической физике квантовых магнетиков и использованию магнитных сред для поиска псевдоскaлярных дальнодействий (частиц типа аксионов и арионов). Работал в ИЯФ им. Будкера старшим, и затем, ведущим научным сотрудником. В
  • · 1998: году защитил докторскую диссертацию по специальности "теоретическая физика" на основе решенных с его участием задач статистической гидродинамики. С
  • · 2003: года работает в Институте Теоретической Физики им. Л.Д.Ландау ведущим научным сотрудником, тогда же был избран на должность заместителя директора ИТФ им. Л.Д.Ландау
  • · Курсы:
  • · Математические методы физики, Физическая Кинетика, Физика Сплошных Сред, Избранные Главы Статистической Физики, Магнетизм -
  • · ФФ НГУ, ФОПФ МФТИ,
  • · Физическая Кинетика - Национальный Исследовательский Университет Высшая Школа Экономики

Награды и поощрения

  • · 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, 2017–2019)

Идентификаторы исследователя

Публикации (53)

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.

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Puch coalescence as a mechanism for eukayotic directional sensing

2007 · ARTICLE · en

Eukaryotic cells possess a sensible chemical compass allowing them to orient toward sources of soluble chemicals. The extracellular chemical signal triggers separation of the cell membrane into two domains populated by different phospholipid molecules and oriented along the signal anisotropy. We propose a theory of this polarization process, which is articulated into subsequent stages of germ nucleation, patch coarsening, and merging into a single domain. We find that the polarization time, t, depends on the anisotropy degree  through the power law t / 2, and that in a cell of radius R there should exist a threshold value th / R1 for the smallest detectable anisotropy

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Dynamics of energy condensation in two-dimensional turbulence

2007 · ARTICLE · en

We report a numerical study, supplemented by phenomenological explanations, of ‘‘energy condensation’’ in forced 2D turbulence in a biperiodic box. Condensation is a finite size effect which occurs after the standard inverse cascade reaches the size of the system. It leads to the emergence of a coherent vortex dipole. We show that the time growth of the dipole is self-similar, and it contains most of the injected energy, thus resulting in an energy spectrum which is markedly steeper than the standard k5=3 one. Once the coherent component is subtracted, however, the remaining fluctuations have a spectrum close to k1. The fluctuations decay slowly as the coherent part grows.

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Polymer statistics in a random flow with mean shear

2005 · ARTICLE · en

We consider the dynamics of a polymer with finite extensibility placed in a chaotic flow with large mean shear, to explain how the polymer statistics changes with Weissenberg number, Wi, the product of the polymer relaxation time and the Lyapunov exponent of the flow, ¯ λ. The probability distribution function (PDF) of the polymer orientation is peaked around a shear-preferred direction, having algebraic tails. The PDF of the tumbling time (separating two subsequent flips), τ , has a maximum estimated as ¯λ−1. This PDF shows an exponential tail for large τ and a small-τ tail determined by the simultaneous statistics of the velocity PDF. Four regimes of Wi are identified for the extension statistics: one below the coil–stretched transition and three above the coil–stretched transition. Emphasis is given to explaining these regimes in terms of the polymer dynamics.

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Effects of surface tension on immiscible Rayleigh-Taylor turbulence

2005 · ARTICLE · en

We present phenomenology describing the internal structure of a turbulent zone, produced as the result of the push of a heavy fluid into a light one, for the case of immiscible fluids. One finds that the Kolmogorov cascade is realized within a range that grows with time, viz., scales between the mixing zone width, L~t2, and the viscous scale, h ~t−1/4. Surface-tension effects lead to formation of an emulsionlike state. Density fluctuations on scales larger than the typical drop size, l, are governed by the Obukhov-Corrsin cascade. If l@h, a wave energy cascade, related to capillary waves propagating along the surfaces of drops, is formed at scales below l, l~t−2/5.

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Non-Gaussian error probability in optical soliton transmission

2004 · ARTICLE · en

We find the probability distribution of the fluctuating parameters of a soliton propagating through a medium with additive noise. Our method is a modification of the instanton formalism (method of optimal fluctuation) based on a saddle-point approximation in the path integral. We first solve consistently a fundamental problem of soliton propagation within the framework of noisy nonlinear Schrödinger equation.We then consider model modifications due to in-line (filtering, amplitude and phase modulation) control. It is examined howcontrol elements change the error probability in optical soliton transmission. Even though a weak noise is considered, we are interested here in probabilities of error-causing large fluctuations which are beyond perturbation theory. We describe in detail a new phenomenon of soliton collapse that occurs under the combined action of noise, filtering and amplitude modulation

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PMD induced fluctuations of Bit-Error-Rate in optical fiber systems

2004 · ARTICLE · en

This paper presents a method that allows evaluating the performance of an optical fiber system where bit errors result from a complex interplay of spontaneous noise generated in optical amplifiers and birefringent disorder of the transmission fiber. We demonstrate that in the presence of temporal fluctuations of birefringence characteristics, the bit-error rate (BER) itself is insufficient for characterizing system performance. Adequate characterization requires introducing the probability distribution function (PDF) of the BER obtained by averaging over many realizations of birefringent disorder. Our theoretical analysis shows that this PDF has an extended tail indicating the importance of anomalously large values of BER.We present the results of comprehensive analysis of the following issues: 1) The dependence of the PDF tail shape on detection details, such as filtering and regular temporal shift adjustment; 2) the changes in the PDF of BER that occur when the first- or higher order polarization mode dispersion (PMD) compensation techniques are applied; 3) an alternative PMD compensation method capable of providing more efficient suppression of extreme outages.

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Extreme outages caused by polarization mode dispersion

2003 · ARTICLE · en

We study the dependence on fiber birefringence of the bit-error rate (BER) caused by amplifier noise in a linear optical fiber telecommunication system. We show that the probability-distribution function of the BER obtained by averaging over many realizations of birefringent disorder has an extended tail that corresponds to anomalously large values of BER. We specifically discuss the dependence of the tail on such details of pulse detection at the fiber output as setting the clock and filtering procedures.

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Probability of anomalously large bit-error rate in long haul optical transmission

2003 · ARTICLE · en

We consider a linear model of optical transmission through a fiber with birefringent disorder in the presence of amplifier noise. Both disorder and noise are assumed to be weak, i.e., the average bit-error rate (BER) is small. The probability distribution function (PDF) of rare violent events leading to the values of BER much larger than its typical value is estimated. We show that the PDF has a long algebraiclike tail.

DOI ↗ PDF ↗

Курсы (5)