• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

相転移の確率過程の立場からの研究

Research Project

Project/Area Number 12740063
Research Category

Grant-in-Aid for Encouragement of Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field General mathematics (including Probability theory/Statistical mathematics)
Research InstitutionKyoto University

Principal Investigator

吉田 伸生  京都大学, 大学院・理学研究科, 講師 (40240303)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordsspectral gap / Glauber dynamics / random walk / wetting transition / Ising model
Research Abstract

非有界なスピンを持つ格子模型(例えばφ^4-格子場)について以下のような結果を得た;
・高温での対数Sobolev不等式の成立
・次の3条件の同値性:(1)スピン相関の指数減衰,(2)Glauber dynamicsに関するspactral gapの存在,(3)Glauber dynamicsに関する対数Sobolev不等式の成立,(4)Glauber dynamicsに関するある種の一様性を持った各点収束。
少し別の方向の研究として以下のようなものに取り組んだ。液体を固体表面においたとき、それぞれの物性に応じて濡れ方が異なる。この「濡れ転移」と呼ばれる物理現象の数学的理解を目指した。1次元ランダムウォークを0以上の値をとるように条件付け、更に0との間に吸引的相互作用を導入する。このとき、相互作用が転移点以下(非局在相:「完全濡れ」の状態)と転移点より大きいとき(局在相:「部分濡れ」の状態)それぞれでランダムウォークの軌跡の巨視的状況を記述する極限定理を導出した。極限として得られた確率過程は固体表面の水滴の形に対応する。

Report

(2 results)
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 吉田伸生: "Application of log-Sobolev inequality to the stochastic dynamics of unbounded spin systems on the lattice"J. Funct. Anal.. 173. 74-102 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田伸生: "The equivalence of the log-Sobolev inequality and a mixing conditions for unbounded spin systems on the lattice"Ann. Inst. Henri Poincare. Probabilites et Statistiques. 37. 223-243 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Alexander: "The spectral gap of the 2-D stochastic Ising model with mixed boundary conditions"J. Stat. Phys.. 104. 89-109 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 磯崎泰樹: "Weakly pinned random walk on the wall : pathwise descriptions of the phase transition"Stoch. Proc. Appl.. 96. 261-284 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nobuo Yoshida: "The equivalence of the log-Sobolev inequality and a mixing condition for unbounded spin systems on the lattice"Annals of Institute Henri Poincore Probabilites et Statistiqoes. 00,0. 1-21 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kenneth Alexander: "The spectral gap of the 2-D stochastic Ising model with mixed boundary conditions"Journal of Statistical Physics. 104. (2001)

    • Related Report
      2000 Annual Research Report

URL: 

Published: 2000-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi