Figure 4
From: Experimental Observation of Negative Effective Gravity in Water Waves
Understanding of the negative effective gravity by measured surface displacements.
(a) Amplitude and (b) phase of η1/η2 as a function of frequency. η1 and η2 are the vertical displacements of water surface for the two points as shown in the inset of Fig. 4b. The red squares are experimental data and the blue curves are theoretical fits. (c) Real and (d) imaginary parts of ge/g0 deduced from the results in Figs. 4a and 4b.
