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We study the fluctuations of a Brownian micro particle trapped with opticaltweezers in a gelatin solution undergoing a fast local temperature quench belowthe sol-gel transition. Contrary to what was previously reported, we observe noanomalous fluctuations in the particle's position that could be interpreted interms of an effective temperature. A careful analysis with ensemble averagesshows only equilibrium-like properties for the fluctuations, even though thesystem is clearly aging. We also provide a detailed discussion on possibleartifacts that could have been interpreted as an effective temperature, such asthe presence of a drift or a mixing in time and ensemble averages in dataanalysis. These considerations are of general interest when dealing withnon-ergodic or non-stationary systems.

Fluctuations in an aging system: absence of effective temperature in the sol-gel transition of a quenched gelatin sample