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We make use of the EDELWEISS-III array of germanium bolometers to search forelectron interactions at the keV scale induced by phenomena beyond the StandardModel. A 90% C.L. lower limit is set on the electron lifetime decaying toinvisibles, $\tau > 1.2\times 10^{24}$ years. We investigate the emission ofaxions or axionlike particles (ALPs) by the Sun, constraining the couplingparameters $g_{ae}<1.1\times 10^{-11}$ and $g_{ae}\times g_{aN}^{\rm eff} <3.5\times 10^{-17}$ at 90% C.L. in the massless limit. We also directly searchfor the absorption of bosonic dark matter particles that would constitute ourlocal galactic halo. Limits are placed on the couplings of ALPs or hiddenphoton dark matter in the mass range $0.8 - 500$ keV/c$^2$. Prospects forsearching for dark matter particles with masses down to 150 eV/c$^2$ usingimproved detectors are presented.

Searches for electron interactions induced by new physics in the EDELWEISS-III germanium bolometers