Abstract
We present several new ideas on how to search for weakly interacting sub-eV particles in laboratory experiments. The first experiment is sensitive to minicharged particles. It exploits that in strong electric fields particle - antiparticle pairs are produced by the Schwinger mechanism. The charged particles move along the lines of the electric field and generate a current that can be measured. The other two experiments are designed to search for hidden-sector photons. They are based on photon - hidden photon oscillations and resemble classic light shining through a wall experiments. One uses (nearly) constant magnetic fields instead of the laser light. Photon - hidden photon mixing would allow these magnetic fields to leak through superconducting shielding which would ordinarily eliminate all magnetic fields. The other one replaces the laser light with microwaves inside cavities. The latter can achieve much higher quality factors than optical cavities increasing the sensitivity.
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