Duffin–Kemmer–Petiau algebra

Defining relations

The Duffin–Kemmer–Petiau matrices have the defining relation :\beta^{a} \beta^{b} \beta^{c} + \beta^{c} \beta^{b} \beta^{a} = \beta^{a} \eta^{b c} + \beta^{c} \eta^{b a} where \eta^{a b} stand for a constant diagonal matrix. The Duffin–Kemmer–Petiau matrices \beta for which \eta^{a b} consists in diagonal elements (+1,-1,...,-1) form part of the Duffin–Kemmer–Petiau equation. Five-dimensional DKP matrices can be represented as: : \beta^{0} = \begin{pmatrix} 0&1&0&0&0\ 1&0&0&0&0\ 0&0&0&0&0\ 0&0&0&0&0\ 0&0&0&0&0 \end{pmatrix} , \quad \beta^{1} = \begin{pmatrix} 0&0&-1&0&0\ 0&0&0&0&0\ 1&0&0&0&0\ 0&0&0&0&0\ 0&0&0&0&0 \end{pmatrix} , \quad \beta^{2} = \begin{pmatrix} 0&0&0&-1&0\ 0&0&0&0&0\ 0&0&0&0&0\ 1&0&0&0&0\ 0&0&0&0&0 \end{pmatrix} , \quad \beta^{3} = \begin{pmatrix} 0&0&0&0&-1\ 0&0&0&0&0\ 0&0&0&0&0\ 0&0&0&0&0\ 1&0&0&0&0 \end{pmatrix} These five-dimensional DKP matrices represent spin-0 particles. The DKP matrices for spin-1 particles are 10-dimensional. The DKP-algebra can be reduced to a direct sum of irreducible subalgebras for spin‐0 and spin‐1 bosons, the subalgebras being defined by multiplication rules for the linearly independent basis elements.

Duffin–Kemmer–Petiau equation

The Duffin–Kemmer–Petiau (DKP) equation, also known as Kemmer equation, is a relativistic wave equation which describes spin-0 and spin-1 particles in the description of the Standard Model. For particles with nonzero mass, the DKP equation is :(i \hbar \beta^{a} \partial_a - m c) \psi = 0 where \beta^{a} are Duffin–Kemmer–Petiau matrices, m is the particle's mass, \psi its wavefunction, \hbar the reduced Planck constant, c the speed of light. For massless particles, the term m c is replaced by a singular matrix \gamma that obeys the relations \beta^{a} \gamma + \gamma \beta^{a} = \beta^{a} and \gamma^2 = \gamma.

The DKP equation for spin-0 is closely linked to the Klein–Gordon equation and the equation for spin-1 to the Proca equations. It suffers the same drawback as the Klein–Gordon equation in that it calls for negative probabilities. Also the De Donder–Weyl covariant Hamiltonian field equations can be formulated in terms of DKP matrices.

History

The Duffin–Kemmer–Petiau algebra was introduced in the 1930s by R.J. Duffin, N. Kemmer and G. Petiau.

References

References

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