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geometricalって？
shiaraの回答
- shiara
- ベストアンサー率33% (85/251)
Aを中心とした光円錐を考えたとき、Bが光円錐上にある場合を「geometrical」と言っているのではないでしょうか。このとき、AとBの間の四次元距離はゼロであり、どの座標系からみてもBは光円錐上にあります。一方、Bが光円錐の中にあれば、Bは時間的な位置にあり、適当な座標系に移ることで、AとBを同じ空間座標にすることができます。このようにすると、AとBは同じ場所で、時間だけが違う、ということになります。
noname#101087
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