17.1 Introduction

perturbative treatment

No ________ starting from a normal g round state could reach this resu lt because F can not be expanded as a power series in this quantity.

electron electron attraction

The ________ operates over D. The ensity of states is called F ..

Debye Frequency

What is associated with lattice vibrations? Answer with a single words or term.

Cooper

________ was the first to observe that the Fermi'sea 'was unstable with respect to the formation of bound pairs.

Bohr radius

Who is 0? Answer with a single words or term.

plasma Frequency

What "is just that? Answer with a single words or term.

Great simplifications

________ occur when the vacuum state is expanded out.

sy mmetry

The system must choose one direction. This ________ is still a classical analogue, though it has been broken spontaneously.

definite phase

What is what B has? Answer with a single words or term.

value of F

What is the electron d ensity? Answer with a single words or term.

usual quantized modes

The ________ are expected to be followed by small oscillations of the field about this minimum.

ultimate test

What is whether such a state is a good approximation to the true ground state for a large but finite system? Answer with a single words or term.

Spontaneous broken lo cal symmetry

________ will be discussed in chapter 19 and applied in chapter 22.

Copyright 2004 IOP Publishing

________ was 'chosen '

order parameter

What "is C .? Answer with a single words or term.

Spontaneous symmetry

What is breaking in field theory? Answer with a single words or term.

Any tower

________ must be a complete space of states.

Neutral anti particles

________ are created when 0 destroys neutral particles.

massless photon field

The ________ will enter at the same time.