We consider a mechanism by which dyons (electrically charged magnetic monopoles) can produce both a T-and P-odd (i.e. time-reversal invariance and parity violating) mixed polarizability β (defined by E = −βE · B, where E is the energy change when electric (E) and magnetic (B) fields are applied to a system) and a T-and P-odd interaction between two particles:ψ 1 γ 5 ψ 1ψ2 ψ 2 , where the ψ i are electron and quark spinors. The latter can create atomic and neutron electric dipole moments. From experimental bounds on these we find limits on the properties of dyons. The contribution of dyons to CP violation in K-meson decays is also estimated.

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A quantum theory of cosmological perturbations is based on the action of Einstein gravity with matter expanded io quadratic order around a background solution of the field equations. If, in the Schriidinger picture, the wavefunction is assumed lo factorize such that each faclor is a function of only a finite number of degrees of freedom (e.g. Fourier wmponenls of the fields) all gauge constrain& can be solved explicitly. This generalizes previous gaugehvarianl quantizarions while clarifying their Limited soape. The result is cast into the more wnvenient Heisenberg picture. It can be found directly from the Lapgian, the Hamiltonian approach serving only as a justification. The wncepi of a Fock vacuum is generalized to several linear but coupled degrees of freedom.PACS number: 9880

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