Space time curvature Definition and 12 Threads

Hi there, I looked around on the net but I didn't quite find the answer to my question. I preface that I don't have training in GR, even though I know about the basics (like what tensors are, geodesics, a bit about topology and differential geometry...). So I wasn't sure if to put this question...

Why do bodies in free fall change position relative to each other? For instance in a vacuum with no external forces why can an apple fall towards the surface of the earth? If these objects aren't accelerating then are they considered at rest? And in what sense of the term 'rest'. I think I can...

hello everyone, though not a scientist or professional student I have a fondness for Earth sciences, geology, seismology, ecology with interests in pole-shift theory, space/time relativity, archeology, anthropology and genetics, specifically, genetic genealogy. Here just to see read about...

is magnetic repulsion and attraction is due to the bending of curvature of spacetime?

How can we define SPACE TIME CURVATURE with respect to dark energy and dark matter ?

What does spacetime curvature means?

If I take it by literally meaning: Mass causes space time to curve. A rubber sheet where the mass is there, it causes the dent, the curvature. So it means the greater the momentum, the greater the curve or the dent. Now if we have a very big mass, I mean to say big in terms of size, the...

Hi all, I am wondering if it is possible to calculate, using Einstein Tensor, the space time curvature around the Earth. As far as I understand, Einstein Field Equations tell us that the presence of a matter curves the space time. So space time curvature is gravity and gravity is space time...

Hi everybody! what happens if an electron passes by with a speed of, say, 99.999999999...% of the speed of light (relative to me). Its mass will then be enormous. Will this electron cause a relevant curvature of spacetime? Can it be so fast that it acts like a black hole? I guess not. But why?

Ok, I have been wondering. I heard that Space/time is Curved when it comes into contact with mass correct? If this is so, then would it be possible to calculate the volume(or some equation) for the curvature of space/time around my own mass or a mass larger then mine? I have already...

Due to mass Space time curves. Consider the case of sun & earth. Sun,since it is heavy will curve the space more than earth.isn't it? Then how come the sun and Earth are being pulled towards each other with same force? The Earth has to straighten the curve (caused by sun)first,and then has...

Energy---> space time curvature In general energy---> space-time curvature Any sperimental evidence that electromagnetism--->space-time curvature? blue