Article

# SURFACE GRAVITY AND HAWKING TEMPERATURE FROM ENTROPIC FORCE VIEWPOINT

Modern Physics Letters A (Impact Factor: 1.11). 11/2011; 25(33). DOI: 10.1142/S0217732310033979

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**ABSTRACT:**We consider generalizations of the entropic accelerating universe recently proposed in [ D. A. Easson, P. H. Frampton and G. F. Smoot Phys. Lett. B 696 273 (2011)] and [D. A. Easson, P. H. Frampton, and G. F. Smoot, arXiv:1003.1528.] and show that their background equations can be made equivalent to a model with a dark energy component with a constant parameter of state wX=-1+2γ/3, where γ is related to the coefficients of the new terms in the Friedmann equations. After discussing all the Friedmann equations for an arbitrary γ, we show how to recover the standard scalings for dust and radiation. The acoustic scale ℓA, related to the peak positions in the pattern of the angular power spectrum of the cosmic microwave background anisotropies, is also computed and yields the stringent bound |γ|≪1. We then argue that future data might be able to distinguish this model from pure ΛCDM (corresponding to γ=0).Physical review D: Particles and fields 05/2010; 84(2). - [Show abstract] [Hide abstract]

**ABSTRACT:**We consider a system of black holes—a simplest substitute of a system of point particles in the mechanics of general relativity—and try to describe their motion with the help of entropic action: a sum of the areas of black hole horizons. We demonstrate that such description is indeed consistent with the Newton’s laws of motion and gravity, modulo numerical coefficients, which coincide but seem different from unity. Since a large part of the modern discussion of entropic reformulation of general relativity is actually based on dimensional considerations, for making a next step it is crucially important to modify the argument, so that these dimensionless parameters acquire correct values.JETP Letters 01/2010; 91(12):615-619. · 1.52 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Using the Unruh-Verlinde temperature obtained by the idea of entropy force, we directly calculated the partition functions of Boson field in Reissner-Nordström spacetime with quantum statistical method. We obtain the expression of the black hole quantum statistical entropy. We find that the term is proportional to the area of black hole horizon and the logarithmic correction term appears. Our result is valid for flat spacetime.Science China: Physics, Mechanics and Astronomy 09/2013; · 1.17 Impact Factor

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