what is spacetime curvature
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In general relativity, the curvature of spacetime is expressed by the Einstein tensor in the Einstein field equations. ... Other hypotheses such as Kaluza-Klein theory and string theory involve a curved spacetime, extended into higher dimensions, in attempts to unify forces as a single phenomenon.
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What does space-time curvature mean?
It's a real thing. You can see it for yourself. Throw a ball. Notice that it follows a curved path. That's the curvature of space-time.
Now, of course, it involves time as well as space, so it's more complex than the rubber sheet thing. Faster things curve less.
What it means, though, is that a falling object follows a path called a geodesic. This is an analogue to a straight line. A ball that is thrown follows the straightest path it can, to the ball. To another observer, such as you standing you the Earth, it appears curved.
There are a couple of caveats.
The first is that some people only call space-time curved when the curvature tensor is non-zero. That happens around the Earth, because gravity goes in different directions and is weaker or stronger depending on where you are. Other people still call it curvature when the gravity is uniform, such as with the hypothetical case of an infinite massive plane. Richard Feynman picked the latter, and if it's good enough for Feynman, it's quite good enough for me.
The second is that, if you want to know exactly what space-time is or how this gravity thingie propagates through space, you're going to have to be satisfied with not knowing, at least for now. There are many ideas, but though we can predict to wonderful accuracy what happens, there isn't anywhere near universal agreement on how it happens.
hope that helps ya ⭐⭐⭐⭐⭐!
It's a real thing. You can see it for yourself. Throw a ball. Notice that it follows a curved path. That's the curvature of space-time.
Now, of course, it involves time as well as space, so it's more complex than the rubber sheet thing. Faster things curve less.
What it means, though, is that a falling object follows a path called a geodesic. This is an analogue to a straight line. A ball that is thrown follows the straightest path it can, to the ball. To another observer, such as you standing you the Earth, it appears curved.
There are a couple of caveats.
The first is that some people only call space-time curved when the curvature tensor is non-zero. That happens around the Earth, because gravity goes in different directions and is weaker or stronger depending on where you are. Other people still call it curvature when the gravity is uniform, such as with the hypothetical case of an infinite massive plane. Richard Feynman picked the latter, and if it's good enough for Feynman, it's quite good enough for me.
The second is that, if you want to know exactly what space-time is or how this gravity thingie propagates through space, you're going to have to be satisfied with not knowing, at least for now. There are many ideas, but though we can predict to wonderful accuracy what happens, there isn't anywhere near universal agreement on how it happens.
hope that helps ya ⭐⭐⭐⭐⭐!
Jia18:
thanks for brainliest
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