{
  "id": "1509.01055",
  "version": "v1",
  "published": "2015-09-03T12:21:01.000Z",
  "updated": "2015-09-03T12:21:01.000Z",
  "title": "Fluctuations in an aging system: absence of effective temperature in the sol-gel transition of a quenched gelatin sample",
  "authors": [
    "Antoine Bérut",
    "Artyom Petrosyan",
    "Juan Ruben Gomez-Solano",
    "Sergio Ciliberto"
  ],
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.soft"
  ],
  "abstract": "We study the fluctuations of a Brownian micro particle trapped with optical tweezers in a gelatin solution undergoing a fast local temperature quench below the sol-gel transition. Contrary to what was previously reported, we observe no anomalous fluctuations in the particle's position that could be interpreted in terms of an effective temperature. A careful analysis with ensemble averages shows only equilibrium-like properties for the fluctuations, even though the system is clearly aging. We also provide a detailed discussion on possible artifacts that could have been interpreted as an effective temperature, such as the presence of a drift or a mixing in time and ensemble averages in data analysis. These considerations are of general interest when dealing with non-ergodic or non-stationary systems.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-09-03T12:21:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "effective temperature",
      "quenched gelatin sample",
      "sol-gel transition",
      "aging system",
      "fluctuations"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}