We proceed to a critical examination of the method used in nuclear fragmentation to exhibit signals of negative heat capacity. We show that this method leads to unsatisfactory results when applied to a simple and well controlled model. Discrepancies are due to incomplete evaluation of potential energies.
@article{arxiv.nucl-th/0406056,
title = {Partial energies fluctuations and negative heat capacities},
author = {Xavier Campi and H. Krivine and E. Plagnol and N. Sator},
journal= {arXiv preprint arXiv:nucl-th/0406056},
year = {2009}
}