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- W2296761359 abstract "In this paper, by solving the Friedman and thermodynamic pressure equations simultaneously, we investigate the relation between the Friedman and thermodynamic pressure equations. Our investigation shows that a prefect fluid, as a suitable solution for the Friedman equations, cannot simultaneously satisfy the thermodynamic pressure equation and Friedman equations. Moreover, we consider various common energy definitions, such as the Komar mass, and try to simultaneously solve the Friedman and thermodynamic pressure equations for various fluids. Our investigation shows that the Komar mass leads to a solution which may unify the primary inflationary and the current accelerating eras into one model. Thereinafter, we consider a general form for the energy of cosmic fluid and combine it with the Friedman and thermodynamic pressure equations to get some new solutions. The cosmological consequences of found solutions are also addressed. In addition, by taking into account a cosmic fluid with the known equation of state, and combining it with the Friedman and thermodynamic pressure equations, we get the corresponding energy of these cosmic fluids and their limitations in the cosmological setup. Therefore, our investigation shows that the thermodynamic pressure equation applies serious constraints on the solutions of the Friedman equations, their corresponding energy and thus the energy definitions. Moreover, we see that the various energy definitions, whenever combined with the Friedman and thermodynamic pressure equations, may give us a motivation for some cosmic fluid models." @default.
- W2296761359 created "2016-06-24" @default.
- W2296761359 creator A5077800151 @default.
- W2296761359 date "2016-02-29" @default.
- W2296761359 modified "2023-09-27" @default.
- W2296761359 title "A note on the mutual relation between thermodynamics, energy definitions and standard cosmology" @default.
- W2296761359 hasPublicationYear "2016" @default.
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