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Dwarf galaxies are thought to host the remnants of the early Universe seedblack holes (BHs) and to be dominated by supernova feedback. However, recentstudies suggest that BH feedback could also strongly impact their growth. Wereport the discovery of 35 dwarf galaxies hosting radio AGN out to redshift$\sim$3.4, which constitutes the highest-redshift sample of AGN in dwarfgalaxies. The galaxies are drawn from the VLA-COSMOS 3 GHz Large Project andall are star-forming. After removing the contribution from star formation tothe radio emission, we find a range of AGN radio luminosities of$L^\mathrm{AGN}_\mathrm{1.4 GHz} \sim 10^{37}$-$10^{40}$ erg s$^{-1}$. Thebolometric luminosities derived from the fit of their spectral energydistribution are $\gtrsim 10^{42}$ erg s$^{-1}$, in agreement with the presenceof AGN in these dwarf galaxies. The 3 GHz radio emission of most of the sourcesis compact and the jet powers range from $Q_\mathrm{jet} \sim 10^{42}$ to10$^{44}$ erg s$^{-1}$. These values, as well as the finding of jetefficiencies $\geq 10$ \% in more than 50\% of the sample, indicate that dwarfgalaxies can host radio jets as powerful as those of massive radio galaxieswhose jet mechanical feedback can strongly affect the formation of stars in thehost galaxy. We conclude that AGN feedback can also have a very strong impacton dwarf galaxies, either triggering or hampering star formation and possiblythe material available for BH growth. This implies that those low-mass AGNhosted in dwarf galaxies might not be the untouched relics of the early seedBHs, which has important implications for seed BH formation models.

Radio jets from AGN in dwarf galaxies in the COSMOS survey: mechanical feedback out to redshift $\sim$3.4