A future superconducting radio-frequency cavity experiment could detect relativistic millicharged particles by picking up the tiny currents their plasma induces in a nearby shielded cavity.
Transport coefficients in the early universe
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abstract
We calculate numerically the electrical conductivity $\sigma$, heat conductivity $\kappa$ and shear viscosity $\eta$ of the hot plasma present in the early universe for the temperature interval $1\MeV\lsim T\lsim 10\GeV$. We use the Boltzmann collision equation to compute all the scattering matrix elements and regulate them by the thermal masses of the $t$- and $u$-channel particles. No leading order approximation is needed because of the numerical integration routines used.
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Direct Deflection of Millicharged Radiation
A future superconducting radio-frequency cavity experiment could detect relativistic millicharged particles by picking up the tiny currents their plasma induces in a nearby shielded cavity.