The effect of a non-minimally coupled scalar field upon classical thermodynamics |
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Authors: | MD Pollock |
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Institution: | Istituto di Fisica “Galileo Galilei”, Università degli Studi di Padova, Via F. Marzolo, 8, 35100 Padova, Italy |
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Abstract: | It is known that a scalar field that is non-minimally coupled to the geometry implies a varying gravitational “constant” Geff, and hence a violation of the continuity equations, , where is the uncorrected energy-momentum tensor. This in turn upsets classical thermodynamics. 3he simplest resolution of this difficulty is to multiply all energetic quantities by , where GN is the newtonian gravitational constant. This modified thermodynamics is applied to the scalar-field version of the cosmological model of Zee, for which it is shown to cause restoration of the symmetry above some critical temperature Tc close to the Planck temperature. We also illustrate how the second law of thermodynamics is always obeyed, correcting a recent discussion by Davies. |
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