If space is the absence of mass-energy (which are absolute), then how do we know it exists physically (with no observer)? Also is it possible that time does not dilate (isn't time invariant by definition?) but the clocks slow down due to energy conservation principles at work?
I am totally...
How do professional scientists make sophisticated calculations, e.g the http://arxiv.org/PS_cache/math-ph/pdf/0412/0412064.pdf [Broken] in general relativity? Are there any special algorithms for this?
I'd really like to solve these equations but it's almost impossible without computer help.
Astronomers announced that stars have a size limit. What does it say about stars' cores? This is still unknown i'd say.
Btw a new yellow star was discovered outside the solar system. Looks very much like our sun.
Physics is advancing really fast since 1900. In fact, at this level we can explain 3/4 of all physical phenomena but there is a deeper reality which has yet to be discovered.
So there are 2 competing theories. One is quantum mechanics which describes the microscopic world and the 2nd is...
This is how highly complex but how is energy conserved in general relativity?
Baez says that energy is conserved by installing energy pseudo-tensors into Einstein's field equations but is that it?
This brought me to the question: How can space expand? Does it mean that i can push off the vacuum? Is space some kind of aether of energetic particles? Do we really know what gravity is (i mean except the curvature of spacetime by mass-energy)? If space has a finite shape but is unbound then...