The study investigates the cooling of strongly interacting Bose gases when the system's dimensionality is reduced from three-dimensional (3D) to two-dimensional (2D) or one-dimensional (1D). The researchers implement precise thermometry in the nanokelvin range, using the decay of the first-order correlation function as a sensitive temperature probe. They find that the temperature in 1D can be significantly lower than in 3D, contrary to the typical expectation of heating due to dimensional reduction. This anomalous cooling is attributed to the interplay between strong interactions and dimensional reduction, leading to a decrease in the number of accessible configurations at low temperatures. The findings are supported by theoretical predictions and numerical simulations, demonstrating the importance of this effect in studying low-dimensional quantum systems.The study investigates the cooling of strongly interacting Bose gases when the system's dimensionality is reduced from three-dimensional (3D) to two-dimensional (2D) or one-dimensional (1D). The researchers implement precise thermometry in the nanokelvin range, using the decay of the first-order correlation function as a sensitive temperature probe. They find that the temperature in 1D can be significantly lower than in 3D, contrary to the typical expectation of heating due to dimensional reduction. This anomalous cooling is attributed to the interplay between strong interactions and dimensional reduction, leading to a decrease in the number of accessible configurations at low temperatures. The findings are supported by theoretical predictions and numerical simulations, demonstrating the importance of this effect in studying low-dimensional quantum systems.