In the universe, several kinds of relativistic jets have been discovered, and it is believed that they are formed by violent phenomena near black holes. Despite the advancement of observations and black hole physics, their acceleration mechanisms are still not understood. Here, using numerical simulations, we show that the relativistic outflow is formed spontaneously by the magnetic field very near the rapidly rotating black hole. Previous simulations showed electromagnetic energy emission and nonrelativistic outflow formation in the black hole magnetosphere, but actual relativistic outflows have not yet been obtained. The present simulation shows that magnetic flux tubes, oblique to the rotation axis across the black hole horizon, are twisted into the shape of screws and propel plasma around the black hole to the relativistic regime.
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