Fig. 2: Analogue cosmological particle creation in a quantum fluid of light.
From: Analogue cosmological particle creation in an ultracold quantum fluid of light
a The static structure factor S(kx, ky, kz′ = 0) at various times after the second quench. The dashed green curves indicate the first minimum of the red curves in (b). The symmetric white points near the center of all panels are due to spurious fringes in the imaging system. b Radial profiles of (a). The black curves are the experimental data. The red curves are the prediction for analogue cosmological particle creation, from Eq. (2). c Density-density correlations. The experimental (black) and theoretical (red) curves are obtained from b by the spherical Fourier transform of Eq. (5).
