Accelerated Expansion of the Universe based on Emergence of Space and Thermodynamics of the Horizon

Bin Sun; Fei-Quan Tu; Yi-Xin Chen; You-chang Yang

Accelerated Expansion of the Universe based on Emergence of Space and Thermodynamics of the Horizon

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arxiv 1707.06461 v1 pith:PRQQ7DWE submitted 2017-07-19 gr-qc hep-th

Fei-Quan Tu , Yi-Xin Chen , Bin Sun , You-Chang Yang This is my paper · ORCID

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keywords evolutionthermodynamicsuniverseequationhorizonobtainedsolutionsderive

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abstract

Researches in the several decades have shown that the dynamics of gravity is closely related to thermodynamics of the horizon. In this paper, we derive the Friedmann acceleration equation based on the idea of "emergence of space" and thermodynamics of the Hubble horizon whose temperature is obtained from the unified first law of thermodynamics. Then we derive another evolution equation of the universe based on the energy balance relation $\rho V_{H}=TS$. Combining the two evolution equations and the equation of state of the cosmic matter, we obtain the evolution solutions of the FRW universe. We find that the solutions obtained by us include the solutions obtained in the standard general relativity(GR) theory. Therefore, it is more general to describe the evolution of the universe in the thermodynamic way.

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First Law of Thermodynamics and Emergence of Cosmic Space in a Non-Flat Universe
gr-qc 2019-08 conditional novelty 5.0 of 10

In a non-flat Friedmann universe, the unified first law dE = TdS + WdV and the energy-flux form -dE = TdS are consistent only when the horizon volume is taken as the areal volume, not the proper invariant volume.

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