Abstract
The pressure evolution of the sound velocity in liquid water in the terahertz regime, ${c}_{\ensuremath{\infty}}$, between 0.05 and 0.88 GPa, at room temperature, has been investigated by synchrotron inelastic x-ray scattering in a diamond anvil cell. We confirm previous results showing that ${c}_{\ensuremath{\infty}}$ increases with density much less than the adiabatic sound velocity ${c}_{s}$, which is reasonably related to the known structural modifications in the hydrogen bond network. At variance with a previous study where an anomaly was found in the density evolution of ${c}_{\ensuremath{\infty}}$---most likely due to the nonisothermal character of the study---the present work reveals a smooth behavior of ${c}_{\ensuremath{\infty}}$, which could provide a useful constraint to the current theories on liquid water.
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