Axial phase of quantum fluids in nanotubes

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We explore the equations of state and other properties of various quantum fluids (3He, 4He, their mixtures, and H₂) confined within individual carbon nanotubes. Above a threshold number of particles, Nₐ, the fluid density near the axis begins to grow above a negligibly small value. The properties of this axial fluid phase are sensitive to the tube size and hence to the transverse compression in the case of a bundle of nanotubes. We consider He at zero temperature and H₂ at low temperatures.