Maxwell s equations. based on S-54. electric field charge density. current density
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1 Maxwell s equations based on S-54 Our next task is to find a quantum field theory description of spin-1 particles, e.g. photons. Classical electrodynamics is governed by Maxwell s equations: electric field charge density current density magnetic field can be solved by writing fields in terms of a scalar potential and a vector potential 150
2 The potentials uniquely determine the fields, but the fields do not uniquely determine the potentials, e.g. arbitrary function of spacetime result in the same electric and magnetic fields. gauge transformation (a change of potentials that does not change the fields) More elegant relativistic notation: four-vector potential, or gauge field the field strength in components: 151
3 The first two Maxwell s equations can be written as: charge-current density 4-vector taking the four-divergence: we find that the electromagnetic current is conserved: The last two Maxwell s equations can be written as: automatically satisfied! 152
4 The gauge transformation in four-vector notation: The field strength transforms as: = 0 (derivatives commute) the field strength is gauge invariant! Next we want to find an action that results in Maxwell s equations as the equations of motion; it should be Lorentz invariant, gauge invariant, parity and time-reversal invariant and no more than second order in derivatives; the only candidate is: we will treat the current as an external source 153
5 obviously gauge invariant In terms of the gauge field: total divergence total divergence equations of motion: equivalent to the first two Maxwell s equations! 154
6 Electrodynamics in Coulomb gauge based on S-55 Next step is to construct the hamiltonian and quantize the electromagnetic field... Which should we quantize? too much freedom due to gauge invariance There is no time derivative of and so this field has no conjugate momentum (and no dynamics). To eliminate the gauge freedom we choose a gauge, e.g. an example of a manifestly relativistic gauge is Lorentz gauge: Coulomb gauge 155
7 We can impose the Coulomb gauge by acting with a projection operator: the lagrangian in terms of scalar and vector potentials: in the momentum space it corresponds to multiplying by the matrix, that projects out the longitudinal component. (also known as transverse gauge) 156
8 integration by parts integration by parts 0 0 equation of motion integration by parts Poisson s equation unique solution: we get the lagrangian: 157
9 the equation of motion for a free field ( ): the general solution: massless Klein-Gordon equation polarization vectors (orthogonal to k) we can choose the polarization vectors to correspond to right- and left-handed circular polarizations: in general: 158
10 following the procedure used for a scalar field we can express the operators in terms of fields: to find the hamiltonian we start with the conjugate momenta: the hamiltonian density is then 159
11 we impose the canonical commutation relations: with the projection operator these correspond to the canonical commutation relations for creation and annihilation operators: (the same procedure as for the scalar field) creation and annihilation operators for photons with helicity +1 (right-circular polarization) and -1 (left-circular polarization) 160
12 now we can write the hamiltonian in terms of creation and annihilation operators: (the same procedure as for the scalar field) 2-times the zero-point energy of a scalar field this form of the hamiltonian of electrodynamics is used in calculations of atomic transition rates,... in particle physics the hamiltonian doesn t play a special role; we start with the lagrangian with specific interactions, calculate correlation functions, plug them into LSZ to get transition amplitudes
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