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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?
Jan
11
asked Is it possible to split baryons and extract useable energy out of it?
Dec
16
awarded  Notable Question
Dec
14
awarded  Popular Question
Nov
3
comment Why are Only Real Things Measurable?
I made further edits to my answers and removed Dirac's quote from two of them.
Nov
3
revised About the complex nature of the wave function?
deleted 680 characters in body
Nov
3
revised Can one do the maths of physics without using $\sqrt{-1}$?
deleted 517 characters in body
Nov
3
comment QM without complex numbers
I do not disagree with your answer. One can for sure formulate QM in a way that uses pairs of real numbers instead of complex ones. However as Dirac points out, one has to be aware that in QM measurements might not commute. If one would formulate QM with pairs of real numbers, it would be more difficult to distinguish between pairs of real numbers, where measurements commute and between pairs of real numbers, where measurements don't commute.