Comment on “Heat capacity, enthalpy fluctuations, and configurational entropy in broken ergodic systems” [J. Chem. Phys. 133, 164503 (2010)]
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A critical examination shows that the specific heat and shear modulus relaxation spectra do not support the notions of continuously broken ergodicity and loss of configurational contribution on isothermal glass transition, nor does the long-known result that C(p) → 0 as T → 0 K prove that S(conf) → 0. Spectra show variation of the real and imaginary components due to phase lag and not due to loss of configurational degrees of freedom. The high-frequency shear modulus, G(∞), of glass increases with time as its fictive temperature decreases and dG(∞)∕dT decreases when a glass forms.
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