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 Apr 29 accepted Can nowadays spin be described using path integrals? Apr 16 awarded Nice Question Apr 16 comment Can nowadays spin be described using path integrals? Google books allows to see the relevant pages online: books.google.de/… Apr 14 asked Can nowadays spin be described using path integrals? Mar 25 awarded Notable Question Mar 20 awarded Popular Question Mar 10 accepted Is it possible to split baryons and extract useable energy out of it? Mar 9 comment Could Gamma ray bursts be caused by matter-antimatter annihilation? I'm talking about these ones: en.wikipedia.org/wiki/Gamma-ray_burst Mar 9 asked Could Gamma ray bursts be caused by matter-antimatter annihilation? Mar 2 accepted How can (in Dirac's terminology) the product of two “real” linear operators be “not real”? Mar 1 comment How can (in Dirac's terminology) the product of two “real” linear operators be “not real”? And self-adjoint/Hermitian means the operator has real eigenvalues? Mar 1 comment How can (in Dirac's terminology) the product of two “real” linear operators be “not real”? I cannot find the word Hermitian on the page before. But maybe you are referring to this sentence: "A linear operator may equal its adjoint, and it is then called self-adjoint. It corresponds to a real dynamical variable, so it may be called alternatively a real linear operator." So for Dirac a real linear operator is a self-adjoint operator and an imaginary operator is then a non-self-adjoint operator? Mar 1 asked How can (in Dirac's terminology) the product of two “real” linear operators be “not real”? Feb 28 awarded Nice Question Feb 22 awarded Popular Question Jan 28 awarded Yearling Jan 12 revised Temperature below absolute zero? typo Jan 12 comment Less than absolute zero possible? A recent paper in Nature (nature.com/nphys/journal/v10/n1/full/nphys2815.html) claims, that negative temperature is a concept based on an inconsistent definition of entropy, see also my answer here: physics.stackexchange.com/a/93398/1648 Jan 12 answered Temperature below absolute zero? Jan 11 comment Is it possible to split baryons and extract useable energy out of it? So one cannot fire an electron onto a proton and by that converting it into a neutron (inverse beta decay/electron capture), waiting for the neutron to beta decay and hope that the electron that comes out has more energy than the electron that I used to begin with? But what if that happens in a radioactive nucleus or otherwise exited nucleus? Couldn't the electron that comes out have a bit more energy than the incoming one, by taking with it some energy from the nucleus?