arrow of timeentropyTime is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity leads therefore to a "problem of time". In my essay, I investigate those consequences for the concept of time that may be ...
Pingback: Q: Why does “curved space-time” cause gravity?: A better answer. « Ask a Mathematician / Ask a Physicist Yoron says: June 30, 2011 at 1:01 am I’m not sure i follow this explanation. It’s simple to see that you can have two parallel lines on a globe too. The...
In almost all cases the vast majority of an object’s movement is tied up in its forward movement through time. The curvature of spacetime (not just space) is responsible for gravity. Literally, near heavy objects, the “future direction” points slightly down. So anything that moves forw...
The implications of such a discovery would be far-reaching. Gravitational memory would be evidence of ahidden form of symmetrythat is thought to saturate the whole universe. This, in turn, would provide vital and potentially decisive clues about a quantum theory of gravity – and what ...
Gravity: foundational questions: quantum concepts in space and time Not Available KUCHARcaron,K. - 《Science》 被引量: 17发表: 1988年 On the quantization of space and time G. 't Hooft, "On the Quantization of Space and Time", in Quantum Gravity: proceedings, ed. M.A. Markov, V.A. ...
So, if gravity is the bending of space-time, gravity is a force and all forces are quantized, maybe space-time itself comes in discrete little blocks. Maybe there are fundamental units of space-time at some unfathomably tiny scale. Welcome to the theory of loop quantum gravity. You may ...
aAs the engine is operated and these fluids are heated, they become less viscous and begin to flow following gravity. Engine production test does not provide a sufficient amount of time for the fluids to be baked off. After the engine is placed into service, the amount of time for the ...
翻译：在太空还没有竞争，偏见和国家冲突。我们所有人都要面对太空的危险。太空值得全人类尽最大的力量...
You aren't as tall at the end of the day as you are at the beginning.That's because as the day goes on,water in the disks of the spine gets compressed due to gravity,making you just a tiny bit shorter.Don't worry,though.Once you get a good night's rest,your ...
There was another important aspect of Einstein's theory which he didn't even realize when he published it. That time was woven into the very fabric of space itself. Einstein used this insight to help develop his general theory of relativity which incorporated gravity. He published it in 1915...