A Hamiltonian in this theory is reduced from a quartic form to a diagonalized quadratic form using a mean-field approximation and the first application of the Bogo∙liubov transformation.
This theory predicts that the ratio of two ultrasound attenuation rates in NMR is maximized at the Hebel-Slichter peak. Color-flavor locking occurs when this theory is imposed on QCD for quarks at low temperature. The key assumption of this theory is that an operator composed of the expectation value of the product of two creation operators is nonzero and does not commute with its annihilation counterpart. A Hamiltonian in this theory is reduced from a quartic form to a diagonalized quadratic form using a mean-field approximation and the first application of the Bogo∙liubov transformation. So-called "conventional" materials are described by this theory, which predicts that heat capacity varies exponentially with a "gap parameter" denoted delta when the system is near its critical temperature. Pairs of electrons condense into bosonic quasi∙particles in, for 10 points, what theory of superconductivity?
This theory predicts that the ratio of two ultrasound attenuation rates in NMR is maximized at the Hebel-Slichter peak.
BCS theory [or Bardeen-Cooper-Schrieffer theory]