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Essay:Demystified gravitation (view source)
Revision as of 19:38, September 13, 2011
, 19:38, September 13, 2011→Introduction
I'm writing this essay to explain to people interested in gravitation how it works according to Einsteinian physics.
I'm writing this essay to explain to people interested in gravitation how it works according to Einsteinian physics.
Between 1905 and 1915 the theory of gravitation switched from Newtonian math to Einsteinian physics and many Newton's problems got solved, mostly due to the fact that the space is not flat ("flat space" means the same as "Euclidean space"<ref>"Flat" or "Euclidean" means our regular (x,y,z) space in which any sphere of surface area <math>4\pi r^2</math> contains volume of space <math>(4/3)\pi r^3</math>.</ref>) but is curved having certain [[curvatures of spacetime]] and the time reflects faithfully these [[curvatures of spacetime]] through the gravitational [[time dilation]] in such way that the whole ''spacetime'' is flat.
Between 1905 and 1915 the theory of gravitation switched from Newtonian math to Einsteinian physics and many Newton's problems got solved, mostly due to the fact that the space is not flat ("flat space" means the same as "Euclidean space"<ref>
This essay is meant to explain this strange physics, with which we deal every day but, except for some people, don't know how it operates and where the "gravitational force" is coming from.
"Flat" or "Euclidean" means our regular (x,y,z) space called also "3-space" in which any 3D sphere (called also "2-sphere" since its surface has only 2 dimensions) of surface area <math>4\pi r^2</math> contains volume of space <math>(4/3)\pi r^3</math>.
</ref>) but is curved having certain [[curvature of space]] and the time reflects faithfully this [[curvature of space]] through the gravitational [[time dilation]] in such way that the whole ''spacetime'' is flat.
This global flatness of spacetime is an important feature. without it the movement of certain geometrical structures (tensors) that describe things in space and time (therefore in 4 dimensions: 3 in space and 1 in time) wouldn't have the property of keeping the strict conservation of energy and momentum between the ''now'' and the ''past'' or the ''furture''. There wouldn't be any [[conservation laws]] valid in the universe. The things would be spontanously created from nothing and disappearing without trace from one moment to another just by the virtue of mathematical manipulation (as it happens in the [[Big Bang]] hypothesis in which spacetime is "curved") (luckily not in this universe of ours since then we would be forced to believe in "ghosts" while they would be created and disappear without no reason whatsoever). The creationist might be happy but the [[science]] wouldn't be as we know it today.
This essay is meant to explain this strange physics of [[gravitation]], with which we deal every day but don't understand it, don't know how it operates and where the "gravitational force" is coming from, except for some physicists<ref>
According to a legend only two of them Albert Einstein and Arthur Eddington, since when a journalist told Eddington that he heard that only three people in the entire world understand relativity, he asked him "who is the third?"
</ref>.
I hope it soon will be clear to the readers that gravitation contains no mystery and is probably the simplest physics around and could hardly work in a different manner.
I hope it soon will be clear to the readers that gravitation contains no mystery and is probably the simplest physics around and could hardly work in a different manner.