geon
ゴン
解説 Definition
物理学で局所化された幾何学的物体。または空間領域。
A geon is a hypothetical localized configuration of gravitational or electromagnetic energy held together by its own gravitational field, often studied as a model of self-confined structure in spacetime and quantum gravity.
覚え方のコツ Memory Tip
geon は gravitational electromagnetic entity の要素を縮めた物理学用語で、語尾の -on は photon や graviton などの粒子名を連想させる。「物質の塊」ではなく、電磁場などのエネルギーが自らの重力によって局在する理論的な時空構造、と捉え、a geon、geon model の形で覚える。
Remember geon through the phrase gravitational electromagnetic entity, whose parts were compressed into g-e-on. The ending also resembles particle terms such as photon and graviton, but a geon is better pictured as a localized bundle of field energy and curved spacetime than as an ordinary material particle. Imagine radiation trapped by the gravity produced by its own energy. Typical combinations include geon concept, geon model, and properties of a geon. This image connects the short technical word with its role in relativity and quantum-gravity discussions.
例文
The geon concept is used in quantum gravity.
ゴン概念は量子重力で使用される。
Physicists study the properties of a geon.
物理学者はゴンの性質を研究する。
The geon model describes spacetime regions.
ゴンモデルは時空領域を記述する。
geon の類義語・関連語
派生語
紛らわしい語
geon の語源・成り立ち Etymology
物理学者ジョン・ホイーラーが1955年に造語。gravitational electromagnetic entity（重力電磁的実体）の頭文字 g-e-on を組み合わせた合成語。重力と電磁波だけで構成される理論上の粒子を指す。関連語：photon（光子）、graviton（重力子）。接尾辞 -on は素粒子名に広く使われる。
The physicist John Archibald Wheeler coined geon in the 1950s from gravitational electromagnetic entity. The initial g and e reflect gravitational and electromagnetic, while the ending -on makes the result resemble established particle names such as photon. Wheeler used the term for a theoretical concentration of electromagnetic or gravitational energy confined by its own gravitational attraction. The word later developed broader technical applications to localized or topologically distinctive structures in spacetime.
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