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| | ipedia.com: Loop quantum gravity Article (Site not responding. Last check: 2007-10-12) |
 | | At present, one of the deepest problems in theoretical physics is harmonizing the theory of general relativity, which describes gravitation and applies to large-scale structures (stars, planets, galaxies), with quantum mechanics, which describes the other three fundamental forces acting on the microscopic scale. |
 | | The physical interpretation of the Lie algebra is that of infinitesimally small group transformations, and gauge bosons (such as the graviton) are Lie algebra representations, not Lie group representations. |
 | | Similarly, many of the equations in classical physics, such as the equations of motion, must be seen as a classical approximation to quantized geometry, and hence, a particle traveling through space is "jumping" from one space-time quantum to the next, much as the electron orbits of a hydrogen atom are quantized. |
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