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Bose condensation of moving rotonsa L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation b Kapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation c Dipartimento di Fisica, Università di Trento and BDC Center, Povo, Trento, I-38050, Italy If the initial roton distribution in helium has a resultant momentum above a certain critical value, it will relax to a state with a Bose condensate of particles with a nonzero momentum. In this state, the velocity of the normal component of the liquid will be equal to the Landau critical velocity.
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