# electroweak phase transition

13 Mar 2013Before the electroweak phase transition of the Universe, all weak bosons are massless just like the photons, and with the temperatures well above TeV, the Higgs-particle hasnâ€™t given any mass to the charged leptons yet. Would there be a way of distinguishing electrons, muons and taus?

physics bonus question: In quantum mechanics, what property of the Hamiltonian operator is responsible for the conservation of probability?

maths bonus question: Can you show that \(\exp(A)\) is unitary if \(A\) is anti-Hermitean, \(A^+=-A\), where \(A^+\) is the complex-conjugated, transposed matrix \(A\)?