重力場とは
アインシュタインが一般相対性理論を発表し、【重力＝時空の曲がり】という重力場の理論を確立しました
イメージとしては、張った布の上に重い球を置くと布がへこむ(凹みが重力場)
そこへ小さい球を転がすと、へこみに沿って転がっていく
直進するはずの光も、へこみに沿って曲がって進む
What is a gravitational field?
When Einstein published his theory of general relativity, he established the concept of the gravitational field, defining gravity as the curvature of spacetime.
To visualize this, imagine placing a heavy sphere on a taut sheet of fabric; the fabric sags, creating a depression—this depression represents the gravitational field.
If you roll a smaller sphere onto the fabric, it follows the curve of that depression.
Even light, which would otherwise travel in a straight line, follows the curve of the depression and bends as it moves.
