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Home News News Archive Science News (2010) Red Chinese physicists hot on holographic universe studies

there is in operation a geometrical mechanism parametrized

by a charged scalar field of breaking a local U(1)

gauge symmetry. Then it was suggested to use the gauge/

gravity duality to construct gravitational duals of the transition

from normal to superconducting states in the boundary

theory [4].

The gravity dual of a superconductor consists of a

system with a black hole and a charged scalar field,

1Department of Physics, Fudan University, 200433 Shanghai, China

2Institute of Physics and Department of Physics, Hunan Normal University, 410081, Changsha, China

Eleftherios Papantonopoulos

Department of Physics, National Technical University of Athens, Zografou Campus GR 157 73, Athens, Greece

Jeferson de Oliveira and A. B. Pavan

Instituto de Fisica, Universidade de Sao Paulo, C.P.66.318, CEP 05315-970, Sao Paulo, Brazil

(Received 17 December 2009; published 13 May 2010)

"The discovery of black hole entropy and thermodynamics

[1] reveals a rather general and profound relation

between gravity and thermodynamics. Later, based on the

area law of entropy for all local acceleration horizons, the

Einstein equations were derived from the first law of

thermodynamics ...

Verlinde derived the Einstein equations [5] from the

equipartition rule of energy and the holographic principle ...

The recovery of the correct entropy/area relation in the

relativistic case is certainly helpful to clarify some subtle

points in this case in Verlinde’s discussion, and to further

investigate the microscopic, or statistical, meaning of the

gravitational thermodynamics..."

Thermodynamics of black holes from equipartition of energy and holography

Yu Tian*

College of Physical Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Xiao-Ning Wu†

Institute of Mathematics, Academy of Mathematics and System Science, The Chinese Academy of Sciences, Beijing 100190, China

and Hua Loo-Keng Key Laboratory of Mathematics, Chinese Academy of Sciences, Beijing 100190, China

(Received 15 March 2010; published 6 May 2010)

'A gravitational potential in the relativistic case is introduced as an alternative to Wald’s potential used

by Verlinde, which reproduces the familiar entropy/area relation S = A/4 (in the natural units) when

Verlinde’s idea is applied to the black hole case. Upon using the equipartition rule, the correct form of the

Komar mass (energy) can also be obtained, which leads to the Einstein equations. It is explicitly shown

that our entropy formula agrees with Verlinde’s entropy variation formula in spherical cases. The

stationary space-times, especially the Kerr-Newman black hole, are then discussed, where it is shown

that the equipartition rule involves the reduced mass, instead of the Arnowitt-Deser-Misner mass, on the

horizon of the black hole."

PHYSICAL REVIEW D 81, 104013 (2010)

Also, the Chinese think they can get Electrodynamics from BIT

Tower Wang^{*}

Center for High-Energy Physics, Peking University, Beijing 100871, China

Received 5 February 2010; published 27 May 2010

Motivated by Verlinde’s theory of entropic gravity, we give a tentative explanation to the Coulomb’s law with an entropic force. When trying to do this, we find the equipartition rule should be extended to charges and the concept of temperature should be reinterpreted. If one accepts the holographic principle as well as our generalizations and reinterpretations, then Coulomb’s law, the Poisson equation, and the Maxwell equations can be derived smoothly. Our attempt can be regarded as a new way to unify the electromagnetic force with gravity, from the entropic origin. Possibly some of our postulates are related to the D-brane picture of black hole thermodynamics.

© 2010 The American Physical Society

Category: Science News Archive (2010)

Written by Jack Sarfatti

Published on Friday, 28 May 2010 20:24

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