11/25/2023 0 Comments Specific entropy![]() ![]() We show that the singularity is again removed, like in the fluid-free model, and a bouncing cosmology emerges so that the present model could mimic a cyclic cosmology. Finally, we introduce a cut-off physics feature in the Minisuperspace by considering a Polymer quantum mechanical approach limiting our attention to the semi-classical dynamics mainly (the quantum treatment is inhibited by the non-local nature of the Hamiltonian operator). In order to make the previous sentence clear, we have to use both specific exergy-specific entropy and exergy density-specific entropy diagrams for the same. However, in the quantum regime the singularity is probabilistically suppressed for some energy eigenvalues and in the case the latter is equal to zero one recovers the standard WDW case. In fact, we show that in the presence of the Lagrangian fluid, the cosmological singularity is restored both in the classical and the quantum regime. You can search for data on specific compounds in the Chemistry WebBook based on. its value depends upon the size of matter. By convention, it is often chosen as the triple-point temperature for water, which turns out to be an appropriate choice here as well. Specific enthalpy is Enthalpy per unit mass. The specific entropy for the liquid, when assuming incompressibility, is (5) Again, the value of the integration constant T 0 plays no physical role in our application. Enthalpy is summation of its internal energy and Pressure volume work done. This concept was formally used to define the second law of thermodynamics. Enthalpy of formation Enthalpy of combustion Heat capacity Entropy. The comparative analysis of Specific Enthalpy vs Enthalpy is shown below: Enthalpy. In particular, we compare the tunnelling of the Universe from the classically forbidden region to the allowed one, showing that considering a time evolution deeply influences the nature of the model. A system with high entropy can do less useful work. In this paper, we analyze the dynamics of an isotropic closed Universe in presence of a cosmological constant term and we compare its behavior in the standard Wheeler–DeWitt equation approach with the one when a Lagrangian fluid is considered in the spirit of the Kuchar–Brown paradigm. Frascati, via Enrico Fermi 45, 00044, Frascati, Rome, Italy ![]() The second law of thermodynamics states that the specific entropy of a. Andrea Campolongo 1 a and Giovanni Montani 1 ,2ĭipartimento di Fisica, Università degli Studi di Roma “Sapienza”, Piazzale Aldo Moro 5, 00185, Rome, Italyįusion and Nuclear Safety Department, ENEA C.R. Entropy is related to the number of microscopic configurations of a thermal system. ![]()
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