時間的超均一ノイズによって駆動される相互作用のないエルゴード性破壊
1Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
Physical review. E
|December 23, 2025
まとめ
時間的超均一ノイズによって駆動されるスピンモデルは、相互作用なしで非エルゴード相へのシャープな遷移を示す。ダイナミクスは初期条件に基づいて凍結し、エルゴード性破壊の新しいメカニズムを明らかにする。
科学分野:
- 統計力学
- 物性物理学
- 複雑系
背景:
- エルゴード性破壊は統計力学における基本的な概念であり、通常は相互作用する系に関連している。
- 超均一性は、大規模な密度変動が抑制された無秩序な系を記述する。
研究 の 目的:
- 時間的超均一ノイズによって駆動されるノルム保存スピンモデルにおけるエルゴード性破壊を調査すること。
- 相互作用とノイズ特性が相転移において果たす役割を探求すること。
主な方法:
- ノルム保存スピンモデルの解析。
- 時間的超均一ノイズによる系の駆動。
- 粒子間相互作用の不在の調査。
主要な成果:
- 相互作用がない状態で、シャープなエルゴード性破壊遷移が観察された。
- 非エルゴード相では、系のダイナミクスは初期状態に依存して凍結する。
- 大域的制約とクラスI超均一ノイズにより、相互作用のないエルゴード性破壊が発生する。
結論:
- 時間的超均一ノイズは、相互作用がない場合でもエルゴード性破壊を誘発することができる。
- この遷移は、ゼロ周波数モードへの変動の凝縮を伴う、ボース・アインシュタイン凝縮に類似している。
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