Say you had some liquid radioactive isotope with a half-life of X. If it was cold, the molecules would move slowly, and thus there would be virtually no time dilation involved, resulting in the standard half-life of X. That same liquid radioactive isotope is now heated up to a very hot temperatur...

It seems that ladder operators exist for nearly all operators. We have the ladder operators for the hamiltonian, for spin, and even for many particle systems where the ladder operators act as creation and annihilation operators. Are there ladder operators for every observable? Is there a general ...

If light cannot escape from a black hole, how do we detect its presence? I mean there is nothing that can be faster than light so if light can not escape from the black hole there should be nothing that can escape from it.