Метод колективних змінних в теорії нелінійних флуктуацій з урахуванням кінетичних процесів

Автор(и)

  • I.R. Yukhnovskii Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine
  • M.V. Tokarchuk Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine, National University “Lviv Polytechnic”
  • P.A. Hlushak Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe67.8.579

Ключові слова:

проста рiдина, нелiнiйнi флуктуацiї, нерiвноважний статистичний оператор, функцiя розподiлу, рiвняння Фоккера–Планка

Анотація

Для узгодженого опису кiнетики та гiдродинамiки систем взаємодiючих частинок оптимiзовано набiр параметрiв скороченого опису згiдно з Боголюбовим, що передбачає залучення колективних змiнних. При цьому роздiляються внески вiд короткосяжних i далекосяжних взаємодiй мiж частинками. Короткосяжнi взаємодiї (наприклад, модель твердих сфер) описуються в координатно iмпульсному просторi, а далекосяжнi – у просторi колективних змiнних. Короткосяжна складова розглядається як базисна. Використовуючи метод нерiвноважного статистичного оператора Зубарєва, ми отримали систему рiвнянь переносу для нерiвноважної одночастинкової функцiї розподiлу, нерiвноважного середнього значення густини енергiї взаємодiї частинок та нерiвноважної функцiї розподiлу колективних змiнних. Застосований метод колективних змiнних дав можливiсть розрахувати у вищих наближеннях, нiж гаусове, як структурну функцiю, так i гiдродинамiчнi швидкостi колективних змiнних.

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Опубліковано

2022-12-04

Як цитувати

Yukhnovskii, I., Tokarchuk, M., & Hlushak, P. (2022). Метод колективних змінних в теорії нелінійних флуктуацій з урахуванням кінетичних процесів. Український фізичний журнал, 67(8), 579. https://doi.org/10.15407/ujpe67.8.579

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Розділ

Фізика рідин та рідинних систем, біофізика і медична фізика

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