282 research outputs found

    Intrinsic Periodicity of Time and Non-maximal Entropy of Universe

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    The universe is certainly not yet in total thermodynamical equilibrium,so clearly some law telling about special initial conditions is needed. A universe or a system imposed to behave periodically gets thereby required ``initial conditions". Those initial conditions will \underline{not} look like having already suffered the heat death, i.e. obtained the maximal entropy, like a random state. The intrinsic periodicity explains successfully why entropy is not maximal, but fails phenomenologically by leading to a \underline{constant}entropy.Comment: 8 page

    Law Behind Second Law of Thermodynamics --Unification with Cosmology--

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    In an abstract setting of a general classical mechanical system as a model for the universe we set up a general formalism for a law behind the second law of thermodynamics, i.e. really for "initial conditions". We propose a unification with the other laws by requiring similar symmetry and locality properties.Comment: 17 page

    On kinetic energy stabilized superconductivity in cuprates

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    The possibility of kinetic energy driven superconductivity in cuprates as was recently found in the tJtJ model is discussed. We argue that the violation of the virial theorem implied by this result is serious and means that the description of superconductivity within the tJtJ model is pathological.Comment: 3 pages, v2 includes additional reference

    On the relationship between dissipation and the rate of spontaneous entropy production from linear irreversible thermodynamics

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    When systems are far from equilibrium, the temperature, the entropy and the thermodynamic entropy production are not defined and the Gibbs entropy does not provide useful information about the physical properties of a system. Furthermore, far from equilibrium, or if the dissipative field changes in time, the spontaneous entropy production of linear irreversible thermodynamics becomes irrelevant. In 2000 we introduced a definition for the dissipation function and showed that for systems of arbitrary size, arbitrarily near or far from equilibrium, the time integral of the ensemble average of this quantity can never decrease. In the low-field limit, its ensemble average becomes equal to the spontaneous entropy production of linear irreversible thermodynamics. We discuss how these quantities are related and why one should use dissipation rather than entropy or entropy production for non-equilibrium systems
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